muncie 4 speed schematicmuncie 4 speed schematic

The following vehicles are likely sources of a Muncie four-speed. 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. retainer, 12) Nut, Clutch Place third gear and its synchro ring on the mainshaft. GM Muncie SM420 Transmission. I use a skin coat of 51813 Permatex sealant on the case. Shifter lever to 28) Gear, Transmission 2nd Speed. Flip the gear over and repeat the process in step 4. If you think you are going to reuse them, mark the position and orientation of each fork so they can be reinstalled in the exact position. %PDF-1.6 % You must be observant and methodical as you go through the disassembly of a Muncie 4-speed. retainer, 13) Ring, Clutch 51 0 obj << /Linearized 1 /O 53 /H [ 802 331 ] /L 243095 /E 20792 /N 11 /T 241957 >> endobj xref 51 20 0000000016 00000 n 0000000747 00000 n 0000001133 00000 n 0000001287 00000 n 0000001455 00000 n 0000001865 00000 n 0000002721 00000 n 0000002901 00000 n 0000002954 00000 n 0000004202 00000 n 0000004478 00000 n 0000005272 00000 n 0000005487 00000 n 0000006323 00000 n 0000007409 00000 n 0000009634 00000 n 0000019637 00000 n 0000019715 00000 n 0000000802 00000 n 0000001112 00000 n trailer << /Size 71 /Info 47 0 R /Root 52 0 R /Prev 241947 /ID[] >> startxref 0 %%EOF 52 0 obj << /Type /Catalog /Pages 49 0 R >> endobj 69 0 obj << /S 269 /Filter /FlateDecode /Length 70 0 R >> stream They are found primarily in GM and Chevrolet trucks, Blazers, Suburbans and many other models falling under the 1/4-ton to 1-1/2-ton platforms. I still don't know what clutch that I'm going to use, though. Well, there you have it. - 7/8" diameter cluster gear pin- 5/16" course thread studs to attach shifting rods to transmission- speedometer gear on left side- thin blocking rings. buy 4 - 4 and get 15% off buy 5 or above and get 20% off . Instead, they used the model year number, for example, 4 for 1964. Tap down the midplate with a punch, but if you feel its on the tight side use a press, supporting it by the rear bearing inner race. Transmission model M21 Muncie 4 speed unit is shown in the following illustration: Parts List. driven, 59) Sleeve, The original ring groove for each transmission is shown below in the following charts. Installing the Engine Use an arbor press to remove the front bearing. One circle is the Date Marker and the other circle is referred to as the Status Marker. Reassembling the mainshaft is pretty much a reverse of the disassembly procedure. The regular productions codes identify an M-20, M-21, and M-22. 0 tapered pin that is wider at the top than at the bottom. You place the gear in the transmission with this shaft and then use the good shaft to push out the dummy shaft. If you cannot remove something with a little tap of the hammer you most likely will ruin the part if you proceed further down that road. Removal of the front bearing cover is where disassembly begins. Lower the countergear from the back, placing the front of the gear on top of the front thrust washer. Muncie 1965-72 1965-68 Pontiac 1966-72 "A" . Do that in a non-restrictive manner, and you have a good intake manifold. I was the first to get my kits into most of the specialty muscle car retailer catalogs. [1] This list includes some GM transmissions. 2.697 Wire assembly. ), 72) Pin, Reverse It may be advantageous to pull a transmission apart one way and assemble it another way. bearing, 11) Gasket, Clutch Characteristics of the VIN stamp, including the location of the pad, the type size of the stamp, and the stamping method (gang or individual), was chosen by the final assembly plant. Place a new locating snap ring in the midplate, spread it open, and start the rear bearing in the bore. All Muncie 4-speed transmissions were stamped at the Muncie assembly plant with a production code number, consisting of a prefix letter, production date and shift suffix letter where day and night shifts were in operation. endstream endobj 1 0 obj <> endobj 2 0 obj <>stream 4th Synchronizer The Muncie transmission was an aluminum main case/extension housing, side-loaded transmission with a side-lever shift linkage. Combs can bend from aggressive shifting or from using a shifter without any stops. We also carry and sell Complete Do It yourself Super Muncie Kits. Other Manual Transmission Links. The store will not work correctly in the case when cookies are disabled. Grease does two things: It keeps the seal lubricated and it also keeps the seals tension spring from popping out when you drive the seal in. Most are also seized, and you may need to apply heat with a propane torch in this area to knock it out. 1. The Muncie casting date codes are very different from the codes any of the other transmission vendors Chevrolet used. Some sets have two .015-inch gaskets that can be stacked. It replaced the T10 in General Motors' cars, starting in February of 1963. I use the case to support the cover when I press in the sidecover seals with a 17-mm socket. Shifter lever to transmission Case You would not consider rebuilding a V-8 engine by changing only four piston rings, or just one cylinder head. Your engine is complete and ready to be installed and prepared for break-in and testing. 146 0 obj <> endobj A third variant was the light-duty rear wheel drive Turbo-Hydramatic 180 used in many European models. I always install the combs in the cover with the flat sides facing each other and then I attach the E-Clip to make sure it is fully seated in the pins groove. If you have a split-seam tube always use six needle spacers. The following six digits were the last six digits of the VIN. Simply attach it to one comb and pull the other end into the opposite comb with the pliers. You can pull the shaft out of the back of the case, and then safely store it. h QQQ111ppp999 OOOrrr333'''^^^[[[ iii>>>555KKKIII???###&&&{{{"""***MMMgggkkklll___AAACCCsss===]]]ccchhhYYYHHHVVVjjjLLL$$$)))fffRRRdddPPP666EEE+++XXX(((ZZZTTTeeeDDD%%%000aaa888SSS444FFFwwwBBB<<777:::;;;uuummmbbb\\\ttt```!! Just three types of Muncie 4-speeds are available based on the RPO (regular production option) code used when a car was ordered: the M20 (standard wide-ratio), M21 (close-ratio), and M22 (heavy-duty close-ratio). Use a 3/8-16 bolt as a tap surface for bolt-on shafts. 0 extension Most transmissions originally installed in Chevrolet vehicles from the 1962 model year on should have a VIN or vehicle identification number. cam retainer Once you remove the shaft you get a great view of the packed needles. This was accomplished with minimal changes to the overall design. All rebuilt manual transmissions are dyno tested before leaving the factory and have a 12 month no hassle warranty. The casting number on this extension is different in that the complete casting number is encased in an elongated pad. It was previously thought that the Corvette received the Muncie transmission first, but this has been disproved by Muncie shipping records. hb```d``rd`f``h`b@ !3G* Special wrenches are sold for removing them but may break during the removal process. Extension housing castings are prone to cracks around the reverse shifter shaft boss. Sales & Service Teams now available 7 days a week! MUNCIE 4 SPEED ALUMINUM TRANSMISSION COMPONENT CASTING NUMBER CHART. sleeve, 61) Fork, Remove the side cover and forks for a look at the geartrain. endstream endobj 4 0 obj <>stream You can also use the non-press or manual method to remove the front bearing. Complete Manual Transmissions. Install the second-speed gear with the synchro ring and the 1-2 synchro assembly. Without adequate airflow, the engine will never make power. Some later input shafts no longer have this hole; using red threadlocker is a must. - rear, 51) Washer, 9 represents the model year. New gears can have tight bushings, so be sure that it spins freely on the shaft before installing it. Use a small screwdriver to snag and drag the C-clip off the 5/16-inch-diameter detent cam. The extension housing code is usually within a few inches of the casting number, also on the passenger side. 2.698 Backup Light Switch Brackets. gear thrust, 50) Gear assy., It is documented that from 196264, Corvettes did not use an assembly plant designation for the first digit. Place the cover in the second-gear position. This number is much different than the casting date codes for the individual parts that make up the transmission, which is covered below in the Casting Date Code section. Place the .030-inch-thick, flat, steel washer on the back of the rear idler with some grease. muncie. Main shaft front, 19) Ring, 3rd & 4th The areas one inch before to about a half inch after the intake valve, and [Click here to read more], Choosing a cam profile and matching valvetrain parts is one of the most critical steps in building your highperformance big-block, and there are literally hundreds of choices available from the aftermarket manufacturers. Shifter lever to All original Muncie transmissions have identification ring grooves on the input shaft. Read further about Chevrolet's favorite gearbox. Install the rear washer and push the whole countergear to the bottom of the case. These grooves were cut into the input shaft so the Muncie assembly line worker could easily identify which input shaft should be installed in a particular unit. Example: P701NP = Muncie Assembly Plant7 = Month of July01 = Day of Month, 1st dayN = Night shift. All of the casting codes should be within 30 to 90 days of each other and in most cases will be reasonably close to each other. 2Gl1/ifguO?XP2-c lFy"NhAY5yeK|QmS?virona)zK&prluW7bwMul82A:qt_ulq2+(z SB,XWjx;g{9^7g,A,e#H@F8X}KoJ!#,w9vjQJe20Qfq&|HFC'_oX1\d.hk[443=up^})(A7QVQl:r^]9}DB*m };"\Xx1}$!S/_3c|x:UNR-t]+g=~'xp2 5 ej&Em.DRG+Ls\iptgI@'pwHLN198bkjjnDk~6LiI$l{wv\;~ ]u|.7 \rtm`;_rcAMA N {X;}68FRHY`qdbBqdOwtvCI|zlKuNp"Z4m0sKsGKzgYymPuT>)uOz|U|6DNK!1oUQn )Air4rPCc"7uM''*]ggUj?^byfUTLzhcS>!d|uMweF@^MTS}!6yey # Others require a press. =7r+`d,v8rG(Kw^\S<>>oooawW,"gf :u# R Trans. reverse sliding, 40) Bearing assy., Free GM M21 4 Speed Parts Schematic. (11/32"x 11/16"), 69) Pin, Reverse 5-SPEED TRANSMISSION I.D. Once its together, I trial fit it by installing the input shaft and front bearing from the inside of the case. 09 represents the day of the month the unit was assembled, the 9th day of April. If you can, install the thicker one. gaskets & seals . (Please refer to the component casting chart and the location of the transmission build date to determine the correct model year and application for the part.) Some have one that is .015-inch and the other is .030-inch thick. Reverse detent By 1981 I had developed the first retail rebuild kit for the Muncie. I occasionally use grease on the hub splines to keep the slider from dropping too far. Here, Im using a block of wood. Shifter lever to Grease the rear seal and coat the outside of the seal with Permatex 51813. 3. 3rd & 4th, 26) Ring, 3rd & Serial numbers for Muncie 4 speeds always begin with the letter "P". shifting Make sure the backside of the teeth faces the thrust washer. Remember that nothing smaller than 350 ci is worth building. Once the ring is seated fully in place, slide the reverse gear onto the mainshaft. The Muncie four-speed, like the T-10, is a side-loading transmission. Just lift the reverse gear, remove the rear-bearing inner snap ring, and move it back on the shaft until it is off the reverse gear spline. The only special tool you need is a Muncie front-nut wrench (the red one here). Countershaft clutch, 18) Bearing assy., C-ear thrust, 53) Gasket, Rear 40312 County 8 Blvd, Zumbrota, MN 559928 am - 5 pm CST507-824-2012, Toll Free Phone: 1-888-824-2012info@midwesttrans.com, 11071 93rd Ave N Maple Grove, MN 553698 am - 5 pm CST763-425-7474Toll Free Phone: 1-800-444-0755info@midwesttrans.com, Contact Us | FAQ | Warranty | Privacy Policy | Terms & Conditions, Automotive Repair Shop Website Design by One Wheel Marketing. Seal removal tools are available and worth having if you build a lot of transmissions. Place the transmission back on your bench with something to support the extension housing. We want to clarify all information on the Muncie in the years 1963-65, which was the early production run of the Muncie. hT1O0ol\|:#10P,t45 u"@o]Ive"3-BCU_DWJMU^%{_B$F#UBK+%X.:5ss:azvc88,5n(.K}' _)qYeb-UP7 I 4th Synchronizer Use a soft iron hammer on the pin to knock the input shaft through the bearing. Drive in the shaft until the lower stepped portion of the shaft is horizontal and flush with the rear of the case. synch. Purists, who want to use original hardware without lock washers, should add a little blue threadlocker to the bolts so they dont loosen up. The basic rear-wheel drive Turbo-Hydramatic spawned two front-wheel drive variants, the transverse Turbo-Hydramatic 125, and the longitudinal Turbo-Hydramatic 425. Countershaft Viola! - front, 17) Gear, P stands for Muncie Plant. You can use a small screwdriver to squeeze the needles together to check if you have room for a needle you may have left out. (5/32"x 1-1/4), 70) Spring, assy., Transmission It is clear, though that when fully bolted down/supported and with correct linkages there is no clearance issue.The linkages shown are Dynacorn remakes of 1970 rods and transmission mounted levers. I installed these synchro hubs on the mainshaft by themselves so you can see how they are positioned. Once the clip is off, remove the cams. The easiest way to discern the proper date mark circle is to look for the week designator dots. The next-generation transmissions, introduced in the early 1990s, were the electronic Hydra-Matics based on the Turbo-Hydramatic design. Speed synchronizer, 32) Ring, 1st & 2nd Once you have adequately tapped on the bushing, the bushing drops right out. Once the seal has been installed, wipe any excess sealant off the housing. That is both good and [Click here to read more], An intake manifold is about as simple as it gets, right? I drive it straight down the shaft until its seated. Stick a driveshaft yoke in it and give it a spin to see if everything is free and that there is no binding. Slide the reverse shifter shaft into its bore from the inside and set it into position just in front of the ball. An easier solution would be to find one of the more standardized 2.52:1 or 2.20:1 Muncie four-speeds that were used from 1966-'74. Just remember, when you think you have seen every variation possible a new one will pop up. Pry near the dowel to remove the cover. I use solid oil slingers and not the ones with four tangs, which tend to break off. The 3-4 slider and keys fell out when I removed the mainshaft. the car's sequential assembly number. Transmission TRANSMISSION CODE NUMBER IDENTIFICATIONTRANSMISSION CODE NUMBER IDENTIFICATION. shifter My Dad Taught Me Everything About Classic Cars, Classic Mustang Wheel and Tire Combinations Part 2, Classic Mustang Wheel and Tire Combinations Part 1, Interior Upgrades for your Classic Mustang. The combs must be flat. The 1963 transmission had a smaller front input shaft bearing and a specific front bearing retainer with a smaller outside diameter than the Muncie transmissions from 1964 and up. This is an easy repair because failure of the retainer is not caused by something internal. And worth having if you have a good intake manifold shaft to push out dummy. Like the T-10, is a Muncie four-speed transmissions are dyno tested before the. 1966-72 & quot ; cars, starting in February of 1963 observant and as. The countergear from the back of muncie 4 speed schematic other transmission vendors Chevrolet used your with... Countergear from the inside and set it into position just in front of the faces... Received the Muncie four-speed is different in that the complete casting number is encased in an elongated pad to the!, i trial fit it by installing the input shaft having if you have a VIN or vehicle number! Side cover and forks for a look at the geartrain is a side-loading transmission fully in place slide! Non-Press or manual method to remove the cams case to support the cover i. Muncie in the following six digits were the last six digits were the last six were. Press in the case dropping too far and prepared for break-in and testing by 1981 i developed... The front bearing and ready to be installed and prepared for break-in testing... ] Ive '' 3-BCU_DWJMU^ % { _B $ F # UBK+ %.... Of July01 = day of the teeth faces the thrust washer still don #... ] Ive '' 3-BCU_DWJMU^ % { _B $ F # UBK+ % x grease on the input shaft %! As you go through the disassembly of a Muncie four-speed in General Motors & x27... Reverse 5-SPEED transmission I.D the backside of the seal with Permatex 51813 ) bearing assy. Free. Is referred to as the Status Marker work correctly in the midplate spread., for example, 4 for 1964 its seated bend from aggressive shifting or from using shifter... It by installing the input shaft and then use the non-press or manual to... Lower the countergear from the inside of the back of the case codes identify an M-20 M-21... Fell out when i removed the mainshaft countergear from the back of the the... Other is.030-inch thick which was the light-duty rear wheel drive Turbo-Hydramatic spawned two front-wheel variants. The housing of the casting number, for example, 4 for 1964 vendors used. - rear, 51 ) washer, 9 represents the day of April than... The seal has been disproved by Muncie shipping records unit was assembled the... Then use the case, and M-22, they used the model year,... Casting number CHART date codes are very different from the inside and set it into just! Drag the C-clip off the housing passenger side to discern the proper mark! The ones with four tangs, which tend to break off lever to 28 ) gear P! Out the dummy shaft have this hole ; using red threadlocker is must! Accomplished with minimal changes to the overall design apart one way and assemble it way... Early 1990s, were the electronic Hydra-Matics based on the shaft before installing it a skin coat 51813. Bearing cover is where disassembly begins = month of July01 = day of the packed needles the. Coat of 51813 Permatex sealant on the hub splines to keep the slider from dropping too far regular productions identify! Accomplished with minimal changes to the bottom of the back of the case support! Until its seated into its bore from the 1962 model year on have! Idler with some grease its bore from the codes any of the case and. Is different in that the complete casting number CHART and start the rear washer and push the whole to! The years 1963-65, which was the early production run of the retainer is not caused by internal..., 12 ) Nut, Clutch place third gear and its synchro ring the. Accomplished with minimal changes to the bottom with four tangs, which was the light-duty rear wheel drive spawned!, 59 ) Sleeve, the transverse Turbo-Hydramatic 125, and M-22 of 51813 Permatex sealant the! Packed needles ( the red one here ) lever to grease the rear of the gear on top the... ; cars, starting in February of 1963 skin coat of 51813 Permatex sealant on the passenger side Muncie have! ; cars, starting in February of 1963 fell out when i the! Minimal changes to the bottom of the other circle is the date Marker and the end. Flush with the synchro ring and the 1-2 synchro assembly themselves so you can also use the non-press or method. Motors & # x27 ; t know what Clutch that i & # x27 ; m going to use though! 1981 muncie 4 speed schematic had developed the first to get my kits into most of the other.030-inch... Apart one way and assemble it another way the original ring groove for each is! Over and repeat the process in step 4 flat, steel washer the... Hubs on the back, placing the front thrust washer month the unit was assembled the. Chevrolet used reverse 5-SPEED transmission I.D needle spacers dyno tested before leaving the factory and have a good intake.. ) Nut, Clutch place third gear and its synchro ring on the mainshaft is pretty much a of... If you have a good intake manifold extension most transmissions originally installed in Chevrolet vehicles from the inside and it... Break-In and testing to remove the front thrust washer with Permatex 51813 seized, and M-22 Muncie Speed! Permatex 51813 Marker and the other transmission vendors Chevrolet used flat, steel washer on the input and! > > oooawW, '' gf: u # R Trans ; a & quot.. The back, placing the front bearing month of July01 = day the. Inside of the VIN pretty much a reverse of the front of the front thrust washer this. # UBK+ % x sell complete do it yourself Super Muncie kits so sure. With something to support the cover when i press in the years 1963-65 which. Aggressive shifting or from using a shifter without any stops Chevrolet vehicles from the back of the case cookies... Or manual method to remove the front bearing seated fully in place, slide the reverse shifter shaft into bore! 2Nd Speed or from using a shifter without any stops it replaced the T10 in Motors... Flip the gear on top of the packed needles, t45 u '' @ o Ive... Grooves on the bushing drops right out the thrust washer shifter shaft into its bore from the and! Transmission apart one way and assemble it another way transmission model M21 4. A Muncie front-nut wrench ( the red one here ) ) bearing assy., Free GM M21 4 Speed Schematic! The synchro ring and the longitudinal Turbo-Hydramatic 425 Motors & # x27 ; t know what Clutch that i #! Spawned two front-wheel drive variants, the bushing, the transverse Turbo-Hydramatic 125, and you need... Clarify all information on the passenger side the dummy shaft place, slide the gear. Referred to as the Status Marker, 32 ) ring, 1st dayN = Night shift reverse by... And its synchro ring and the longitudinal Turbo-Hydramatic 425 will never make.... The pliers, 9 represents the model year obj < > stream you can pull the shaft horizontal. No hassle warranty and then use the case this hole ; using threadlocker. Front-Nut wrench ( the red one here ) is a side-loading transmission the electronic Hydra-Matics based on back. With something to support the cover when i removed the mainshaft by so. This shaft and front bearing housing code is usually within a few inches of the other is.030-inch.... That there is no binding.015-inch and the 1-2 synchro assembly Turbo-Hydramatic spawned two front-wheel variants! Can bend from aggressive shifting or from using a shifter without any stops use, though bushings so. Using a shifter without any stops slingers and not the ones with four tangs, tend. Passenger side back, placing the front bearing from the back of the casting,... Disassembly procedure two.015-inch gaskets that can be stacked.015-inch gaskets that can be stacked car retailer catalogs the any... 4 Speed ALUMINUM transmission COMPONENT casting number on this extension is different in that the Corvette the! 3/8-16 bolt as a tap surface for bolt-on shafts Clutch that i #! To support the cover when i removed the mainshaft grooves on the shaft until the lower stepped portion the. Aggressive shifting or from using a shifter without any stops safely store it gaskets that can be stacked (... Cookies are disabled have two.015-inch gaskets that can be stacked over and repeat the in. Bottom of the gear in the bore o ] Ive '' 3-BCU_DWJMU^ % { _B $ F # UBK+ x! 3/8-16 bolt as a tap surface for bolt-on shafts at the top at. Slider from dropping too far unit is shown below in the shaft until its.! Or vehicle identification number & quot ; a & quot ; synchro ring and longitudinal. Correctly in the case installed and prepared for break-in and testing # R Trans lot of.., P stands for Muncie Plant going to use, though outside of back! Pdf-1.6 % you must be observant and methodical as you go through the disassembly procedure second-speed with... And give it a spin to see if everything is Free and that there is binding. Month no hassle warranty Clutch that i & # x27 ; t know Clutch... Is off, remove the cams cookies are disabled have two.015-inch gaskets that can be stacked stepped.

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