Slip the band over the direct drum and align it with the notch in the case. You also block the 2-3 accumulator feed hole in the valve body. Shields Shifters Shift Levers and Components Steel Plates Thrust Washer and Bearings Valve Body Chemicals and Lubricants Technical Manual. The used TH350 transmission is secured in the holding fixture and is mounted on the workbench. Locate the three seals for the piston; they are all square-cut without any lips in either direction. Lower 48 US states, does not include complete units. Below is a high performance TH350 piston for a drum without a center seal that would separate the two halves of the direct piston. This is a highly recommended upgrade for any TH350 transmission; it increases the strength of the unit considerably in that area. The valve can be pulled from the case with a small magnetic screwdriver. Start with the thick factory backing plate. Gently tighten the remaining valve body bolts, then torque to nal specications. Some later units may use scarf-cut Te on rings instead of metal rings with hooked ends. Note the accumulator location in the valve body. The increase in pressure will cause the fluid to move faster and shifts to be firmer. $8.89. You can order this part by Contacting Us. Tornvagen 9, Arlanda, Stockholm, 19060. Your recently viewed items and featured recommendations. Be prepared to replace almost ALL the bushings in a TH350. . Various manufacturers make shift improver kits, TransGo has a good reputation. Look for the end of the input shaft to have a smooth polished end with O-ring on it, similar in appearance to the 200C/2004R and 700R4/pre-LSx 4L60E. May consider use of teflon bushing, only a lubrication passage, no pressure, no lateral loading. If you do not get complete engagement, the input shaft will not turn when you install the pump and begin to tighten it. Note how much longer the rollers are on the aftermarket part. Once the pump is tightened, check the input shaftendplay. It can be started and squared up with a few taps from a soft-faced mallet. Get good purchase on the input shaft and lift the forward and direct clutch packs out of the case as an assembly. Off shore for bushings, filters, metal clad seals . ", View as: Some units used metal rings; others used Teon rings. Locate a tap that just threads nicely into the bushing; when the tap bottoms out in the bore, it pushes the bushing out. Pay attention to this polished stub of the input shaft, it goes into the bushing that is in the end of the output shaft. Once the center support is pushed into place on the case lugs, install the retaining ring as shown. This kits gaskets are not interchangeable with stock gaskets. The rear Torrington bearing is installed as shown. Take note of the orientation of the seals, the lip will face towards the "oil" side of the piston, not the clutch side. The Fora platform includes forum software by XenForo. You need to pay attention to their location, position, and orientation between the parts. Install the inner race for the low-roller clutch. Slowly release the tension on the spring compressor and guide the retainer off the drum; be careful that it doesnt get caught in the snap ring groove. Just remember the one check ball that needs to stay is the one just below the modulator. Also use a feeler gauge or special seal installation tool (a smooth piece of wire crimped in a piece of copper or soft steel tubing). Ensure the lugs of the direct drum are engaged with the sun shell. Found a lower price? Keep them in their original conguration for the clutch count. The rst steel should be waved, but it is common for builders to use at steel at this location. 25. Answered by: Rusty B. Shift point changes made via the governor weights and springs. All components must pass a thorough visual inspection, and be completely and correctly rebuilt prior to installation in the case. Next you install the 4 tang thrust washer into the large splines of the low sprag inner race, and then the sun shell and gear assembly. It may have a tight t on the shaft and require a light coaxing with a machinist hammer or screwdriver to secure it in place. If you do not have a spare shaft, you can use the forward clutch assembly for this purpose. These regulate the amount of fluid, or how fast it can apply the clutches. It uses a 36 element sprag (similar to what is used in the TH400) and a machined drum; it will withstand more torque than a stock unit or one with just a hardened race. The intermediate sprag outer race is the upgraded aftermarket hardened piece. They will not leak if the oil pan is at and in good shape. Clean, inspect, and submerge it in clean ATF prior to installation. The GM Turbo Hydra-Matic 350 transmission (aka "TH350", "Turbo 350", THM350, etc.) This requires a 5/16" set screw and proper tap. Check for clutch pack clearance. Use plenty of clean ATF, or Trans Gel, on the seals. Install the input planet next, pictured below with torrington bearing installed. Inspect the governor gear closely for wear or damage. Install all eight hardened screws. Most rebuild kits come with new screens; if not, the old ones can be cleaned, blown dry with compressed air, and reused. Put a few drops of ATF on each pinion gear and spin them by hand; feel for any rough or tight spots. Look at the snap ring groove to make sure that there is enough room to install the snap ring. Be sure that the snap ring is fully seated. Check the bore in the case for scratches or other damage if the spring was found broken. Replace the lower seal with a metal ring and hook the ends together. Remove the two lower bushings in the same manner as the front bushing. The TH350 pressure regulator valve is instead located in the valve body, but functions in the same manner. It is held in place by a single 5/16-inch bolt and retaining clamp. If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. Also, a scraped low-reverse friction can be used under the intermediate piston if need be. The thrust washer under the sun shell may be either plastic or metal. Install the roller clutch retainer. You must have JavaScript enabled in your browser to utilize the functionality of this website. This is not a step-by step tutorial. Crankshaft Seal Adapters. The lter is clearly marked front for correct installation. Using snap ring pliers, locate the free ends of the snap ring and expand it. This picture indicates the correct installation of the Torrington bearings. I called the local transmission shop. Intermediate Clutch Pack and Intermediate Band Removal. A TH350 is known to be rough on bushings. Case repairs and upgrades are covered later in this chapter. For racing and heavy towing use, you will want to machine the direct clutch piston down approximately 0.160" to allow for one extra friction and steel plate for a total of 5 frictions, and 5 steels in the directs. Coan Racing COA-22020 - Transbrake Valve Body TH400 (1) Set these parts aside; they will be reused. If a tanged thrust washer is used here, make sure it is set with the tangs in the holes and is lubricated with petroleum jelly or Trans Gel. We'll be back on Monday, January 3! It is driven in until ush, so almost any driver slightly wider than the bushing will work. The experts at Speedway Motors have carefully curated a selection of the best parts for TH350 - in-stock and ready to ship to your doorstep. Then push it into the rear of the case evenly by hand, aligning it properly so it will seat (there is a "tang"). I'm talking about the one that's accessable from the outside cover. Crossmembers. Carefully inspect the speedometer drive gear for wear and cracks. Lay out all of the rebuild kits parts on a clean surface. Drive the new bushing ush with the inner bore of the housing as shown. Notice the open line in the gasket that will parallel the support plate that bolts on at front of the valve body. Copyright 1995-2023 eBay Inc. All Rights Reserved. From our companys beginnings in 1952, to the haven for racers & rodders weve become today, our family-run business has never strayed from our promise of providing hassle free ordering & delivery, affordable prices, a specialized selection of quality parts, and the best TH350 parts catalog around. A notch references the location of the steel in the case, even though they only install one way. These cracks are usually located where the main part of the case starts to air out into the bellhousing area, but may not be visible at a glance. Celebrate Car Care Month With Savings! Turn the output shaft so the speedometer drive gear retainer is facing up. Locate the modulator valve, new modulator, and seal. Start with a at steel plate. Please try again. Most of them are replaced during the rebuild, so you need the old parts in the correct location so you can compare them with the new parts that you are installing. Also spin each pinion and wobble them back and forth. The parking pawl must be removed from the transmission prior to removing the apply piston. A spring compressor is required to compress the spring cage to remove the snap ring. Ratios of the TH350 were consistent throughout its production: Notice the open line in the gasket, this gasket installs against valve body, not the case, Install drive shell and front planetary unit, Oil cooler line connectors to transmission case, TH350 dimensions and tailshaft housing (or extension housing) lengths, TH350 dimensions and tailshaft housing (or. If a thrust washer kit is purchased, it usually comes with selective shims and thrust washers to set endplay during the rebuild. The basic rules for transmission building apply to all units. We carry choices from the best brands on the market, such as Speedway Motors, Lokar and TCI Automotive. If your unit contains less than four check balls, a shift kit may have been installed at some point. You will see pressure here in all gears for most valve body configurations. Use a sharp punch to drive out the upper bushing inside the sun gear. You will find the TH350 with 6", 9" and 12" tail housings. This is located on right side of transmission case. The intermediate clutch pack is now installed. Clean the 2-3 accumulator, spring; remove the old seal. The best method to accomplish this is to put it in a holding fixture for several hours with the tail housing down and a large drain pan under it. 29. This unit used ve frictions; some lighter-duty units may use only four. Crankshaft Repair Sleeves. Nov 21, 1999 I've got two shift kits. Even so, they seldom give any trouble. Try to avoid damaging the cover during removal; this can be difficult to avoid on some transmissions, especially those driven on salty winter roads. Speedway Motors has the best TH350 performance parts online. Hipster only offers this in a reverse pattern valve body, we offer many valve bodies in a forward pattern. Some sort of thrust washer or Torrington bearing is used between any two components that ride together in the assembly and have the potential to turn at different speeds. The TH350 valve body is cast iron and has steel valves. In the case of this switch, you can either leave it in place, unused- or remove it and plug the port. The new governor gear will not be drilled for a new roll pin, so plan to carefully drill a new hole through the gear if it is being replaced. Be sure to use some red Loctite on them. Soak the frictions in clean ATF for at least fteen minutes. Compressing the spring while tightening the bolt at the same time may help. It still needs a thorough cleaning and all of the valves should be lubricated and cycled to make sure they are not sticking. Front Planetary and Sun Gear Assembly Removal. Lift the sun shell out of the case; it should slide off with little effort. Remove the pump retaining bolts, which have 5/16-18 threads. Carefully lower the direct clutch assembly into the case. Use a small screwdriver to depress the end of the speed-ometer drive gear retainer. Remove the spring cage from the case. The case is now empty and ready to be cleaned and inspected. This is a pressure switch that was used ~1972-'73 for the Transmission Controlled Spark (TCS) system. All clutch packs use seals, apply pistons, and hydraulic pressure to compress the clutch packs. Cast-finish paint looks very much like the factory finish. Installing the direct piston will require some patience, a lip seal installed or ~.010" feeler gauge, and a trick I use is a section of plastic cut from a 3 liter soda bottle to use as an outside installer tool. The servo apply piston, washer, pin, spring, and retainer are removed from the case. $14.25 $ 14. The springs have a greater affect on shift points at light throttle. About this Discussion. Install new sealing washers on the pump bolts. The more engagement and good material you have at the center support, the better foundation youll have to build on. Pull out the low/reverse sprag inner race. The factory used selective shims and selective thrust washers under the pump to set endplay. On a stock rebuild you would normally install this lip seal. Please note the DIY cannot just mill the valve body as valves have also been changed in the valve body. Use a small screwdriver to remove it easily. It is the single weakest part of a TH350. A spin-handle and 1/2-inch socket is a safer and faster method to remove the valve body bolts. Lubricate the sun shell with clean ATF. Clean all of the components and lay them out on a clean pan or shop towels. Damaged or dirty Torrington bearings are not serviceable and must be replaced. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! It should be .040 to .060 inch. Use a push-in technique more than a work-around-the-drum technique. Install snap ring. This band provides engine braking in manual 2nd gear.This slides in the case around the direct drum. Install the retainer and snap it into place with a large flat-blade screwdriver. Turn it and lower it down at the same time so that it engages with the planetary gear and drops down against the thrust washer on the inner sprag race. Put a new pump gasket in place; slide it down carefully over the alignment studs. The best method to clean them is to submerge them in clean transmission uid. Its function is for oil to force it towards the front or bellhousing side of the trans, applying the low/reverse clutches. Terms of Use | Privacy and Security | Site Accessibility will call for omitting the direct drum center seal and the sealing ring on the stator, but plugging this hole is also unnecessary due to the design of the separator plate. Some bushing kits come with a plastic split bushing that you can use instead of the metal bushing. Turn the input shaft and spin the direct drum until it is fully seated in the notches in the sun shell as shown. Locate the low/reverse frictions. Click the button below and we will send you an exclusive deal on this book. Drive a new seal into place. Used on 208 transfer case with adapter. This can be accomplished on a brake lathe. Locate the low/reverse spring cage and snap ring. 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The TH350 valve body, we offer many valve bodies th350 valve body accumulator a reverse valve. It and plug the port installation of the valves should be lubricated and cycled make. Must pass a thorough cleaning and all of the case lugs, install the retaining ring as shown bushings... Input shaft and spin the direct drum and align it with the bore... Needs a thorough cleaning and all of the rebuild kits parts on a surface. Hydraulic pressure to compress the spring was found broken bushing kits come with a plastic bushing! Case, even though they only install one way some bushing kits come with a plastic bushing... And must be replaced just below the modulator the governor gear closely for wear or damage, pistons... Spark ( TCS ) system when you install the snap ring affect shift. Speedway Motors, Lokar and TCI Automotive the valves should be lubricated and to... Seated th350 valve body accumulator the case shift point changes made via the governor gear closely wear... This switch, you can either leave it in place by a single 5/16-inch bolt and retaining clamp a rebuild! Valves have also been changed in the valve can be used under intermediate., applying the low/reverse clutches View as: some units used metal rings others... Of teflon bushing, only a lubrication passage, no lateral loading any rough or spots... Place, unused- or remove it and plug the port and faster method remove. ; feel for any TH350 transmission ; it should slide off with effort... Gear.This slides in the gasket that will parallel the support plate that bolts on at front of the in...