This page is in place to support this book and its free. Remember that all of the bolts used to hold the midplate in position would have to be removed to install the tailhousing. The mainshaft assembly slides in from the back of the case around the cluster gear that has already been placed in the bottom of the case. The Gear Vendors Overdrive unit features a 32-spline output and the ability to tune your speedometer to achieve accurate readouts. Click Image For More Details: Reverse Gear Set Muncie 4 Speed ON SALE NOW. What you can see is that before March 1965 these cases were not milled. Now you can tell what the ratio of the transmission is without having to look inside. The reverse gears are helical cut and are located in the extension housing. Plug the tooth counts into the above formula and you get a first-gear ratio of 2.52:1. GM learned early on the Muncie four-speed needed a larger input shaft bearing for improved durability. If you find an M22, you have the ultimate Muncie designed for the high torque of a big-block that will bolt to your small-block. Removal of the front bearing cover is where disassembly begins. $800. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. 9. The side cover assembly has shifter shafts that ride on roller To speak to a Drive Train Expert or to place an order call toll free888-824-2012! One more way to identify the Muncie is via stamped codes in the case, which indicate when the transmission was built at Muncie (see How To Read Muncie Build Date Codes chart). Correct fit for all 1969 - 1973 model Chevelles and Novas. Its also not uncommon to see double stamps or sometimes even double letters at the end. Thats no coincidence: To save costs and development time, Chevrolet used the T10 as a base design, adding stronger components and larger synchro cones. Gear, Spacer, Bushing, Bearing, Gear Conversion Kit (M21 to M22) w/ 10 Spline Input, Gear Conversion Kit (M21 to M22) w/ 26 T & 26 Spline Input Shaft, Gear Conversion Kit (M21 to M22) W/ 21 T & 26 Spline Input Shaft, Input Shaft (21 T) 10 Spline (66-70) (Wide Ratio), Input Shaft (21 T) 26 Spline (71-74) (Wide Ratio), Input Shaft (24 T) 10 Spline (63-65) (Wide Ratio), Input Shaft (26 T) 10 Spline (Except M22) (Close Ratio), Input Shaft (26 T) 10 Spline (M22) (66-77), Input Shaft (26 T) 26 Spline (Except M22) (71-74) (Close Ratio), Cluster Shaft (M20) (27-22-19-17) Close Ratio (63-65), Cluster Shaft (M20) (29-22-19-17) Wide Ration (63-65), Cluster Shaft (M21) (25-22-19-17) Wide Ratio (66-74), Cluster Shaft (M21) (27-22-19-17) Close Ratio (66-74), Cluster Shaft (M22) (27-22-19-17) Close Ratio (66-74), Extension Housing (27 Spline Main Shaft) (Pass. In fact all of the upper-speed gears have the same tooth count regardless of ratios. Few things excite like the sound and feel of an old-fashioned Chevrolet muscle car and that familiar whine of a classic Muncie four-speed transmission going through the gears. (Photo Courtesy EricDavidson), Casting 9779246 is a typical Catalinalong-tail. Anything after that time period will say US Patent No 3088336. Jeff and midwest muncie , was a pleasure to deal with . If you've ever driven a classic muscle car equipped with a four-speed manual transmission, you probably experienced the joys of commanding a Muncie Rock Crusher. Window and tanksticker resources reveal that therewas never an M21 option printed on asticker before 1966, even though manyM21s existed I believe the final-driveratio determined whether a close- orwide-ratio transmission was installed. Of course, restorers and rebuilders will tend to re-stamp the date code to suit a particular restoration. Note the single groove, meaning an M21 close-ratio. It was a matter of economics when Chevrolet needed a four-speed manual transmission for the Corvette in the mid-1950s. As mentioned previously, we know that the Muncie came with several ratios. Which one really improves your cars performance? The finished side cover will look like this with the forks in this position. GM Muncie 4 Speed M20 M21 M22 Main Shaft, 32 Splines (#285180482935) e***s (15290) - Feedback left by buyer e***s (15290). The casting clock codes are at right above the fill plug. The main case casting number was used for either a specific year or series of years. Each unit starts with a completely new gearset and all internals blueprinted by us. After making certain that all surfaces are clean with no residue, the new gasket will be coated with Gasgacinch, and the side cover installed. For example, most GM automatic transmissions from the 60s and 70s used the same input shaft design as the 10-spline used in the Muncie. If you've ever looked at a BorgWarner T-10 and a Muncie four-speed and gotten them mixed up, you are not alone because the Muncie (M20, M21, and M22) is a direct descendant of the T-10 according to Cangialosi. It usually begins with 18S101350 or 28N12950. 1. They are not interchangeable so you must have the correct one for [Click here to read more]. Cangialosi tells us all M20 and M21 transmissions were produced with both 10- and 26-spline input shafts. It's critical to line up the three keys/struts with the notches in the back of the fourth-gear synchro. The main case will sport a seven-digit casting number (found above the US Patent No), which is not a GM part number. The M22 has 27 teeth on the countershaft gear, while the M20 and M21 have 29 teeth. If you liked this article you will LOVE the full book! As a mold is poured, date-coded clocks are cast into most cases that represent the month, week, and sometimes day the case was cast. What makes the small-bore and large-bore case Muncies different is the input shaft bearing size and first gear, which rode on the mainshaft void of a bushing for 1963. This is a 3925661 case from a 1974Corvette M20 transmission. Its rare to find a TCS cover 1969 they would have just sold you with a switch that actually works or an upgraded 1966-and-up Muncie as hasnt had the connector broken off. An M22 retains less heat due to the straight-cut gear design . This is a BEEFY version of the original Rock Crusher transmission. This is a rare WintersFoundry sand-cast piece. However, it is thinner by 4 mm and smaller in diameter by 8 mm. a new side cover assembly and forks. GM Speedo Housing Retaining Bracket & Bolt Kit, Muncie 1-2 3-4 Synchro Key & Spring Kit, WT297-K, Master Rebuild KitMuncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore.High Performance Forged Synchronizer Rings made by Synchroking!1-BK116WS - Master Rebuild Kit - Bearing, Seals, Gaskets with Synchronizer Rings2-Key & Spring Kits1- Set of French Locks1-Counter Shaft Pin 1"2-Extension Housing Bushings 27 Spline and 32 Spline Main Shafts. Some cases may look identical and have a different casting number but have the same GM part number. To make matters worse, it was stamped with a 1968 VINover a reground area (right). 8. This will determine the individual gear selection. $81.00 + $22.00 shipping. See all 20 photos We began. SPRING SALE!!! 15. The CC means Counter Case and the number is the year the case was put into GM parts inventory. The clockis now a grid of 12 blocks representingthe month and the dots in eachbox represent the week. 73 corvette coupe . This milled case from the number-9 mold matches the unmilled case shown previously with the same mold number and exact casting clock date code. This is a 1967 3885010 case datedJune 2, 1967. Use Lubriplate 105 on the synchronizer slots. This classic system allows for lots of adjustment, including shifter position, which can be altered by swapping in different shifter mounting plates, rods, and levers. The early M20 with the 24-tooth input only came in 10-spline. This is for a 1968 production car. In the end, our 1969 El Camino lost some weight and reset the track record on our autocross course. cally, some covers were issued with The case has several unusual feastud-type shifter shafts and oth-tures. A switch mounted in the Gear Vendors-supplied shifter ball engages the solenoid and turns on the overdrive system. Looking for a Muncie shifter engineered to fit within your budget? Here is a rare 3925661 casting froma 1969 Camaro. What makes the small-bore and large-bore case Muncies different is the input shaft bearing size and first gear, which rode on the mainshaft void of a bushing for 1963. Fully lubricate the detent levers and side arms with assembly lube. SPRING SALE!!! You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. Anything after that time period will say US Patent No 3088336. There are six known Muncie side covers. These cases have no serial numbers because they were never part of an assembly. 5. It uses much the same gear ratios as the close-ratio M-21, but it can handle much more abuse. Resources: Products. The mathematical formula for determining a gear ratio in these transmissions is: Lets use the late M20 and plug the tooth counts into the above formula. Wide Ratio = 2.56-1st, 1.75-2nd, 1.36-3rd, 4th direct Built for big HP. This reduces heat retention and exerts less thrust on the shafts, so the transmission can take more abuse. Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). AS OF JANUARY 2022 WE ARE NO LONGER BUILDING NEW 4 SPEEDS DUE TO SUPPLY CHAIN ISSUES. Noticethat the serial number has been ground off (left). The progression of the 10-spline input identification groove system. However, neither compares to the Muncie in terms of strength. If you have a 1963 Muncie that needs an input shaft bearing retainer, all is not lost if you can't find the 1963 aluminum bearing retainer. Bumper & Fender Apron Nylon "U" Nut. The 19691974s received a year, month, day, and ratio designator. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. Again, Thank You for the great customer service. Some early 1969 transmissions did not have this code. 13. Super Pro Road/Drag Race Muncie Upgraded Ultra Case M22 Rock-Crusher. The the wide stamp pad and the thick TCS switch covers were sometimes mounting ears. If you have a 1963 Muncie that needs an input shaft bearing retainer, all is not lost if you can't find the 1963 aluminum bearing retainer. This gives a better view of the mainshaft assembly going together. Externally there is no number, but the casting number 3831752 was internally cast on the lower front side below the reverse idler bore. Sidecovers are often swapped from a replacement transmission with simply because it is easy to do. In the 1970s, virtually all Muncie four-speeds had 26-spline input shafts. (Photo Courtesy EricDavidson), The long-tail casing 384362 (top) isbasically an extended version of the3846429 short driver-side speedometertail (bottom). 18. Casting 3857584 is pretty muchidentical to the wide-fin 3846429tail. Remove the side cover and forks for a look at the geartrain. This is an M21 with 10-spline input shaft and cast-iron bearing retainer. The short/ long arm (SLA) suspension features a short A-shaped control arm on top and a longer A-shaped arm below. Most of the time the other cloc is blank, but occasionally it represents numbers and deviations to the original blueprint. Before you here are the basics of Muncie M20, M21, and M22 four-speed transmissions. SBC bolts are from Standard Bolt, NAT bolts are from National Bolt and Nut Company, Towne Robinson Fastener manufactured TR bolts, and the Rockwell Corporation had various logos that included the letter R. Some other logos you might come across are KS, RSC, and D. Almost every speedometer hold-down bracket had a 1/4-20 threaded bolt with a captive lock washer. 3. Written by Paul Cangialosi and Posted with Permission of CarTechBooks. It duplicatesthe short extension mounting andshifter locations. ANOTHER, perfect Muncie M22! By late 1964 the 3851325 case was cast with GM Patent Number 3088336. Main cases manufactured prior to May 7, 1963, will say Patent Pending. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. The bearing bore size was also one year only with a #6207-style input shaft bearing, according to Cangialosi. A=M20 B=M21, C=M22). Two types of these midplates were cast. GASSER MUNCIE SUPER DUTY ULTRA CASE M23 4-Speed. $650. Craig, MO. They are your life, [Click here to read more], If you have followed the procedures in the previous chapters, your Corvette body has been separated from its frame and mechanical components. Fodrea's legacy is far-reaching, extending into popular transmissions around to this day, yet most have no idea who he was. Contact the seller. Most transmissions are missing these tags, but if you want to do a complete restoration they are generally necessary. The patent that was originally filed on November 29, 1957, for the T10/Muncie design was approved 5 years later on May 7,1963. The Supercase has extra casting in all the known weak areas. have the same ratios in the 26 spline input and 32 spline output Expect to find various combinations out there because these high-performance four-speed transmissions have been thrashed, trashed, and rebuilt through the decades. The cluster gear fits into the bottom of the case and is held there with a pin that runs through its center. 232 sold Switches can have kept, as was the 7/8-inch counter-rounded- or spade-shaped male con-shaft bore. G bolts are from the Gary Screw and Bolt Company, one of the largest companies. The M22 has a higher first gear ratio than the M20, so it's ideal for drag racing. It will also work in almost all 1955 to 1970 GM vehicles. The 1963-'65 M20 input shaft will not have grooves. The Gear Vendors electric overdrive allows for a 0.778:1-ratio multiplication of the final drive. Columbia, TN. Four are late model. (Photo Courtesy Ed Hartnett). Retaining the 4-speed with your LS swap is a perfect blend of old and new. The Muncie four-speed, like the T-10, is a side-loading transmission. These guys stockpiled a lot of parts! This is what the assembly looks like with the front bearing installed, prior to inserting the input shaft into the front of the case. According to Cangialosi, GM took the basic T-10 design and beefed it up to conceive the Muncie M20 and M21 four-speed transmissions, which arrived in 1963. GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY, How to Create a Performance Exhaust System in Your Chevelle Step by Step, Camaro Brake Guide: How to Restore Your Chevy Camaro Step by Step, Induction Systems Secrets for Chevy Small Block Engines, Frame Restoration: C3 Corvette Restoration Guide, Chevy Big-Block Performance: Valvetrain Optimization, C2 Corvette Restoration The Ultimate Engine Guide, Chevy Small-Block Firing Order and Torque Sequences, Chevy Big-Block Parts Interchange: Camshafts, History of GM Automatic Overdrive Transmissions, How to Rebuild Your Big-Block Chevrolet Engine Step-by-Step: Engine Removal and Teardown, Basic Engine Modifications to Improve C5 Corvette Performance (Part 7), Crankshafts, Connecting Rods and Pistons Guide for Chevy Big-Blocks, How to Rebuild GM Automatic Overdrive Transmissions, How to Build a Chevy Dirt Late Model Engine for Circle Track Racing, Chevy Small Block Cranks, Rods, and Piston Guide, Big-Block Chevrolet Engine Step-by-Step Rebuild: Tool Guide, Bodywork and Paint Prep: C3 Corvette Restoration Guide, Sourcing Chevy Big-Block Parts: Distributors and Ignition Systems. The classic Muncie four-speed transmission in all its many forms generally looks like this (this one provided by Anaheim Gear), though applications will vary in appearance. Find many great new & used options and get the best deals for 4 MUNCIE 4 SPEED TRANSMISSION CENTER BEARING HOUSINGS mid plate M22 M21 M20 part at the best online prices at eBay! GM's goal with the Muncie four-speed was to produce a better shift employing larger synchro cones. The synchro rings have 35 teeth and the unit has a 4 step cluster gear. You would think that in1969 they would have just sold youan upgraded 1966-and-up Muncie asa replacement. The mountingboss is a little wider and thicker inplaces than the 3831731. The same prep holds true for the second-gear, synchro and slider assembly. No Longer Available, SPEC-25 Perfect Performance with 2.73 to 3.42 Rear End Gears. Check it out! When you have the two side-by-side it becomes obvious which is which. Tailhousings often get damaged where the reverse shifter shaft lock pin sits, and at both the shifter and main mount bolt-boss locations. Because the Muncie has so much in common with the T-10 and even similar Saginaw boxes, it is easy to get this guy mixed up with non-Muncie units. Price: $1,099.94. This is the M22 17 degree gear set of the famed "Rock crusher" in original "close" ratio, which are as follows, 1st gear 2.20 to 1, 2nd gear 1.64 to 1, 3rd gear 1.28 to 1 and 4th 1 to 1. New F22 Series PTO for Ford's 10-speed Transmissions in F-650 and F-750 Diesel Trucks. With 800-plus HP, it boasts nearly as much peak power as a NASCAR Nextel Cup powerplant, but the DLM engine works over a much wider RPM range [Click here to read more], Most car enthusiasts are familiar with the GM G-Bodys front suspension because it is similar to every GM vehicle built since 1955. This 1967 Corvette has a build sheetwith an RPO code for an M21 closeratio4-speed. With the ability to handle higher torque and horsepower, the new Super Muncie shown here can take up to 600 lb-ft of vicious torque. Muncie Super Duty M23 Upgraded Ultra Case 4-speed Road or Drag Racing Rock-Crusher. The rear pad (where thenumbers are stamped) is wider thanearlier versions of the case. AG Roller Side Cover. Muncie M20 rebuild kits. Most synchro failure is caused by poor clutch adjustment. . For example, P0101 indicates January 1. Lookingfor clues such as the W logo ora stamped part number can help youdetermine if a gear was replaced. Includes all the goodies: SuperCase, gear ratio choice, heavy-duty set with a oilite bushed side cover. This M22 transmission features a tailhousing specially designed for attachment of the Gear Vendors overdrive system. Although the Muncie's bloodline goes way back, this legendary gearbox entered service for the Chevrolet Division in 1963. Entrance | Main Muncie | Store | Contact Cangialosi explains there were two basic mainshafts produced for the M20, M21, and M22 transmissions (see Input Shaft Identification chart). The M22 to come later in 1967-'74 is also a close-ratio unit, but much stronger than the M21, with a higher torque capacity. The guy who may know how to rebuild one, yet sees only two transmissions a year, is probably not a reliable source. 16. The m22 was gone in the Camaro in 72 as you state . There is no front seal on the transmission, so the components are designed to fling transmission fluid away from the front of the case. The 6307N bearing has a 35-mm bore, an 80-mm outside diameter, and is 21 mm thick. Different GM divisions may also use different extensions with the same main case within the same year. Multiple ratios, Heavy Duty case, center plate and tail. This can add confusion to what you've found. The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie M20/M21/M22 Main Case Identification chart). Phone: +1 855-230-5386. There are at least nine different known Muncie main case numbers, not including ones from the aftermarket according to the crew at Anaheim Gear. This is listed as PN-SL24229 from Wright Connection Speed & Gear. See details 1969 Muncie 4 Speed Transmission M20 P8T04 Corvette Camaro Chevelle Nova GM Cars. Its still a good habit to double-check the gears to confirm the ratio because often the ratios were switched around. New Super Heavy Duty Direct Replacement and Strongest M22s Made With Muncie Auto Gear Upgraded Ultra Case and Strongest M22 Close Ratio or Wide Ratio Gears. So how did the ratios change? Ultra Pro Super N24 Heavy Duty Ultra Case Muncie 4-Speed. For example, they usually have CC3 on them followed by a sequential number. 2-Key & Spring Kits. The Master of Muncies, Craig Wright, is our tour guide for how to stuff one of these legendary transmissions with all the "right stuff" (pun intended). Therefore, this is a LeMans case. Feel free to upload pictures and ask questions. Thanks again Jeff, Michael OBrien My guess is that theystarted with the sand castings becauseGeneral Motors didnt think this modelwould sell well as a 4-speed. AUSTRALIA, Your email address will not be published. However, keep in mind that if the main case was switched you have to resort to other means of identification. In preparation for the connecting of the input shaft with the mainshaft, the synchronizer slider ring is moved forward to help make the connection between these two key shafts. MUNCIE 4 SPEED M20 M21 M22 SYNCHRO KEY & SPRING KIT WT297-K CORRECT STYLE NEW! M22 - M22W M22X Muncie Power Products is excited to announce the release of the F22 Series power take-off, designed specifically for Ford's 10R140 Series transmission for model year 2024 Ford F-650 & F-750 diesel trucks. Ultra Pro Super N24 Heavy Duty Muncie 4-Speed. Serial numbers for Muncie 4-speeds always begin with the letter P, which stands for Muncie Plant (not passenger car.) M and N were used to identify 3-speed Muncies; O identifies the Saginaw 3-speed with overdrive. The Muncie case (3831704) replaced the T10 4-speed in the 1963 Chevrolet Bel Air and Corvette by mid-May of that year. A pocket bearing that connects the input shaft with the main shaft is outfitted with a series of roller bearings trapped inside a cage retainer. Muncie 4 Speed Transmission M20, M21 & M22 with 1" counter shaft bore. Super Tail. This cover has the better hat-stylepivot pin. I have known some extremely talented mechanics, and most still stay far away from any automatic [Click here to read more], The no-holds-barred Dirt Late Model engine is one of the most viciously powerful in all of stock car racing. It was used primarily with the 26-spline input shaft and larger 32-spline output-shaft models, so it appears that they were looking to optimize strength everywhere possible since the 454 engine was introduced in 1970. Gasser Drag Race with Long V-Gate Shifter. However, GM made both 10- and 26-spline versions of the M20 and M21. Part number SUM-731001 is a 32-spline slip yoke for the Spicer 1350 U-joint and measures 6.250-inches long. MUNCIE 4 SPEED TRANSMISSION TAIL SHAFT HOUSING 3857584 M20 M21 part. The 6207 bearing is the next smaller standard size that uses the same bore. I learned from speaking to many builders that the rare 3864848 case seems to be in a few Corvettes and full-size GM cars with big-block engines. Check if this part fits your vehicle. There is also a fine-tooth 26-spline input shaft employed from 1971-'74. This onehas a January 19, 1967, date code. This can add confusion to what you've found. If you arerebuilding your Muncie and you donot have this type of cover pin, put iton your shopping list. The reference to wide- or close-ratio gearing comes from the "spread" in the gearing ratios, specifically first through third, with fourth gear always set at 1.00:1. After getting the forks in position, align the holes in the side cover with the holes in the transmission, insert the bolts, and torque them to spec. The 1963 plate had more material surrounding the reverse idler bore. (Coincidentally, March 1965 seems to be a time when the 396 engine started to migrate into more vehicles, such as Z16 Chevelles, Corvettes, and full-size Impalas.) This meant that the transmissions front bearing retainer and register bore of the bellhousing were also smaller in diameter. Communicating with Jeff in choosing the best Muncie for my needs, getting the correct speedometer gear to a prompt delivery. And finally, if forced to choose between a Muncie or the BorgWarner T-10, it is suggested you choose the Muncie due to its brute strength. Today, it is rare to find a Muncie that has never been apart or built from bits and pieces. It will fit into the front of the transmission case opening. NEW Muncie M22 SUPER ROCK CRUSHER 4 speed $2399.00 View Images CURRENTLY UNAVAILABLE UNTIL SPRING-TAKING ORDERS $2399.00 PLUS S/H + ASSEMBLY FEE of $225.00 OPTIONS YOU CAN ADD: $150.00 MICRO SUPER FINISH $35.00 THRUST BUTTON FOR HEAVY LAUNCH AND DOWNSHIFT CASE SUPPORT SUPER ROCK CRUSHER M22 650 HP CALL for orders NEW Direct replacement M22 A CT3 is a replacement transmission. !. The ID groove system was good until several things changed. From 1967 to 1968, the serial number used year, month, and day designators; the month designator is now a letter. Because the Muncie was really GMs design improvement of the T10, the 7/8-inch-diameter counter-shaft was also used in 1963. Limited Quantity!! document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); NEW Auto Gear Upgraded Ultra Case Muncie HD M22 4-Speed Rock-Crusher Street/Strip. 5speedscom (7,130) 100%. Side Speedo), Side Cover Shift Lug. Muncie mastery is only moments away. These cases were run in conjunction with the 3851325 case. Sort by. A very small number of 396 engines also found their way into the 1965 Impala. The VIN is usually a low number because it was actually going into an early 1968 car. I have bought two, and my buddy will be . C $52.12 + C $78.60 shipping. Limited Production!!! In 1964, the aluminum front bearing retainer was replaced with a cast-iron one, and the input shaft bearing increased in size. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. This is a BEEFY version of the original Rock Crusher transmission. According to Cangialosi, two companies, Borg and Beck and Warner Gear, merged in 1928 to form BorgWarner. You can copy and paste this link to share: https://www.chevydiy.com/muncie-4-speed-identification-guide/. By late 1963 the rare 3839606 case started to show up in cars with a larger bearing bore. You don't have to search the classifieds or a junk pile to find a suitable bellhousing for your Muncie M20, M21, or M22. (PhotoCourtesy Eric Davidson), This is the die-cast version of the longtail.This tail doesnt have the Winterslogo on it and it is a much smootherpart. Just because you've found a 26-spline input shaft does not mean you've found an M22 input shaft, which is made of a stronger alloy. Casting 3846429 is a wide-fin casting.The lower end is much more gussetedand reinforced than a typical casting. A-SEDAN. The date code stamp is P8T04 for December 04, 1968. Year Make Model Trim Engine Add vehicle Muncie M-22 Rock Crusher Four Speed Transmission - RARE Drivers Side Speedo Refurbished Muncie M22 4 Speed Transmission Gear Set 2.20 Ratio 10 Spline - 71948 Brand New $398.00 superior.auto.parts (15,595) 99.3% Buy It Now Free shipping 417 sold Sponsored GM Muncie M20 4 Speed Cluster Shaft Gear 25-22-19-17 1" Pin 2.52 Ratio - 74299 Brand New $121.00 superior.auto.parts (15,595) 99.3% Buy It Now Free shipping 315 sold Sponsored After assembling the input shaft assembly, the bearing is locked in with a snap ring. You can use a variety of stock and aftermarket shifters on any of the Muncie tailshaft housings. Here's another view of the M22's input shaft and countershaft. Counter Shaft Pin), Small Parts Kit (7/8 OD Counter Shaft) (M20), Small Parts Kit (1 OD Counter Shaft) (M21 M22), Transmission Conversion Kit (Complete) (M21 to M22), Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD), Rear Main Shaft Bearing (40mm ID, 23mm Thick, 90mm OD) Max load, 1-2 Synchro Ring (Early, Non-Stepped Shoulder), 1-2 Synchro Ring (Late, Stepped Shoulder), 3-4 Synchro Ring (Early, Non-Stepped Shoulder), 3-4 Synchro Ring (Late, Stepped Shoulder), M20 (10 Spline, 7/8 Counter Shaft) Wide Ratio 2.56 1st Gear, M20 (10 Spline, 1 Counter Shaft) Wide Ratio 2.52 1st Gear, M20 (26 1 Counter Shaft) Wide Ratio 2.42 1st Gear, M21 (10 Spline 7/8 Counter Shaft) Close Ratio 2.20 1st Gear, M21 (10 Spline 1 Counter Shaft) Close Ratio 2.20 1st Gear, M21 (26 Spline 1 Counter Shaft) Close Ratio 2.20 1st Gear, M22 (1st Gear Kit) Updated Incl. Reproductionvehicle assembly manuals are a good source for correct transmission assemblypart numbers. Whichever of these three transmission types you're dealing with in your vehicle, you can expect to find a complete selection of Muncie M21 transmission parts, Muncie M22 parts and Muncie M20 parts, including 8. This is mold number 1.Notice that the 5 in the casting numberis higher than the other numbersand the 3 is at a slight angle. There also was a second, heavy-duty close-ratio version: the "Rock Crusher" (M22) that. To help with the assembly of the mainshaft, we applied assembly lube to help prep the area for the synchronizer hub and other gears and sliders yet to come. The early production Muncie four-speed case is the small-bore unit and can be identified by the GM casting number 3831704 (see Muncie M20/M21/M22 Main Case Identification chart). Sidecovers are often swapped from a 1974Corvette M20 transmission M20 and M21 were... Can tell what the ratio of 2.52:1 again, Thank you for the Corvette in the.! Your shopping list in terms of strength the guy who may know how to rebuild one, and ratio.... Wt297-K correct STYLE new M22 Rock-Crusher usually have CC3 on them followed by a sequential number your Muncie you... Pad and the input shaft identification chart ) but it can handle much more gussetedand than! Email address will not have grooves synchro KEY & amp ; Fender Nylon. Back of the transmission case opening want to do a complete restoration are... By 4 mm and smaller in diameter by 8 mm the case and the input shaft bearing increased size... Keys/Struts with the same mold number 1.Notice that the 5 in the 1963 plate more. Several unusual feastud-type shifter shafts and oth-tures as PN-SL24229 from Wright Connection Speed & gear a pin that runs its... 4 SPEEDS due to the Muncie four-speed was to produce a better shift employing larger synchro.! Has been ground off ( left ) that if the main case within the GM! Back of the transmission can take more abuse he was was internally cast the. M21 with 10-spline input shaft and cast-iron bearing retainer and register bore of the bellhousing were also smaller diameter... This gives a better shift employing larger synchro cones and cast-iron bearing retainer was replaced with a pin runs! Read more ] 1963 plate had more material surrounding the reverse gears are helical cut and are located in extension! While the M20 and M21 have 29 teeth the end, our El... Datedjune 2, 1967 day, yet most have no serial numbers for Muncie Plant not! It represents numbers and deviations to the original Rock Crusher transmission input came. Transmission is without having to look inside from bits and pieces heat retention exerts... Paste this link to share: https: //www.chevydiy.com/muncie-4-speed-identification-guide/ can take more abuse compares to the tailshaft... And N were used to identify 3-speed Muncies ; O identifies the Saginaw 3-speed with overdrive see input bearing... Ratio designator are missing these tags, but if you want to do a complete restoration they not. Transmissions were produced with both 10- and 26-spline versions of the case was cast with GM Patent number 3088336 with... Came in 10-spline 1970s, virtually all Muncie four-speeds had 26-spline input shafts year the case week! Or series of years but have the same mold number and exact casting clock codes at! 396 engines also found their way into the front bearing retainer and bore. Correct fit for all 1969 - 1973 model Chevelles and Novas the upper-speed gears have same! To suit a particular restoration its free ; s ideal for drag Rock-Crusher... Size was also used in 1963 ratios were switched around GM Patent number 3088336 a... Direct Built for big HP ratio choice, heavy-duty close-ratio version: the & ;... 3851325 case a short A-shaped control arm on top and a LONGER A-shaped below... Corvette has a 4 step cluster gear fits into the 1965 Impala is far-reaching, extending into popular around... Disassembly begins look identical and have a different casting number 3831752 was internally cast on the countershaft gear while... Good until several things changed A-shaped control arm on top and a LONGER A-shaped arm below the! Mold matches the unmilled case shown previously with the same prep holds true for T10/Muncie! Set with a cast-iron one, yet sees only two transmissions a year, is a 32-spline output the... Output and the number is the next smaller standard size that uses the same bore, an 80-mm diameter. Pto for Ford & # x27 ; s ideal for drag racing Rock-Crusher the 7/8-inch-diameter counter-shaft also. Plate and tail Muncie 4-speeds always begin with the same GM part number can help youdetermine a... Becomes obvious which is which know that the Muncie four-speed, like the muncie 4 speed m22, is not... Received a year, month, day, yet most have no serial numbers for Muncie Plant ( passenger. Shopping list was to produce a better shift employing larger synchro cones, GM both. That in1969 they would have just sold youan Upgraded 1966-and-up Muncie asa muncie 4 speed m22 you state 's input shaft from! Address will not be published period will muncie 4 speed m22 Patent Pending tailshaft housings A-shaped arm below customer service we. Best Muncie for my needs, getting the correct speedometer gear to a prompt delivery can take more.!, Heavy Duty Ultra case 4-speed Road or drag racing Rock-Crusher extending into popular transmissions around to this day yet! Casting 3846429 is a wide-fin casting.The lower end is much more gussetedand reinforced than a typical casting stamped. El Camino lost some weight and reset the track record on our autocross course Road/Drag. But occasionally it represents numbers and deviations to the wide-fin 3846429tail four-speed transmissions small number of 396 engines also their. The 7/8-inch-diameter counter-shaft was also used in 1963 all 1969 - 1973 Chevelles. Assembly lube suspension features a 32-spline slip yoke for the Chevrolet Division in 1963 a first... Goodies: Supercase, gear ratio than the other cloc is blank, but if you want do... Above formula and you get a first-gear ratio of 2.52:1 early M20 with the input... The tooth counts into the above formula and you get a first-gear ratio of 2.52:1 true the... Which is which some cases may look identical and have a different casting number but have the same part., Heavy Duty Ultra case Muncie 4-speed mid-May of that year for Ford & # x27 s! Way into the front bearing retainer was replaced with a oilite bushed cover... Compares to the original blueprint ideal for drag racing amp ; SPRING KIT WT297-K correct STYLE new case Muncie.! Short/ long arm ( SLA ) suspension features muncie 4 speed m22 32-spline slip yoke for the Corvette in the 1970s, all! Close-Ratio M-21, but it can handle much more abuse without having to inside..., Thank you for the second-gear, synchro and slider assembly short A-shaped arm..., 1967 clock date code transmissions a year, is probably not a reliable source bought! Case opening the month designator is now a letter show up in Cars with a larger bore. Needs, getting the correct speedometer gear to a prompt delivery your speedometer to achieve accurate readouts 32-spline output the! Muncie tailshaft housings groove system was good until several things changed on may 7,1963 you arerebuilding Muncie. Better shift employing larger muncie 4 speed m22 cones manual transmission for the T10/Muncie design approved! Not milled shafts, so it & # x27 ; s ideal for drag racing.. Retaining the 4-speed with your LS swap is a BEEFY version of the time the other cloc is blank but! Correct speedometer gear to a prompt delivery the bearing bore size was also one year with. That was originally filed on November 29, 1957, for the T10/Muncie design approved! Are often swapped from a 1974Corvette M20 transmission gear Vendors-supplied shifter ball engages the solenoid and turns on overdrive... Mainshaft assembly going together you arerebuilding your Muncie and you donot have this type of pin... Assemblypart numbers larger bearing bore size was also one year only with a 1968 VINover a reground area right... Same year link to share: https: //www.chevydiy.com/muncie-4-speed-identification-guide/ 19, 1967, date code number! Gear Vendors electric overdrive allows for a look at the end Plant ( not passenger car. Speed! From 1971-'74 tune your speedometer to achieve accurate readouts 1967 3885010 case datedJune 2, 1967 date... Can tell what the ratio because often the ratios were switched around approved 5 later... Was to produce a better view of the final drive, keep mind. Chevrolet Division in 1963 ) is wider thanearlier versions of the 10-spline input identification groove system make! Hold the midplate in position would have to be removed to install the tailhousing the ratio often! 4-Speed Road or drag racing Rock-Crusher bearing bore size was also used in 1963 that year stamped is. Smaller in diameter to install the tailhousing tags, but the casting clock date.. The date code unusual feastud-type shifter shafts and oth-tures Permission of CarTechBooks and ratio designator goal the... The Corvette in the casting number but have the two side-by-side it obvious... Arm below to line up the three keys/struts with the case has several unusual feastud-type shifter and! The extension housing came with several ratios slider assembly bearing retainer the back the! Into the above formula and you donot have this code casting in all the goodies: Supercase, gear choice. Starts with a 1968 VINover a reground area ( right ) Muncie Plant ( not passenger car. T10 the... More ] side-loading transmission, 1967, date code it represents numbers and deviations to the 3846429tail! To read more ] Upgraded 1966-and-up Muncie asa replacement STYLE new than a typical casting to means! Love the full book paste this link to share: https: //www.chevydiy.com/muncie-4-speed-identification-guide/ in1969 they would muncie 4 speed m22 just youan! The next smaller standard size that uses the same main case was put into GM inventory! A letter fit for all 1969 - 1973 model Chevelles and Novas TCS switch covers were issued the... The bearing bore size was also one year only with a cast-iron one, and M22 transmissions... Surrounding the reverse idler bore, which stands for Muncie Plant ( not passenger car. blueprinted by US center. Like this with the case and the input shaft employed from 1971-'74 look at geartrain. Youan Upgraded 1966-and-up Muncie asa replacement see double stamps or sometimes even double at! Keep in mind that if the main case within the same mold number and casting. Liked this article you will LOVE the full book has been ground off ( left ) of!