You do not need to remove any valves or springs to rebuild the transmission. If you are performing a stock rebuild, always use the stock gaskets. The piston is about 0.990" thick. Product Code: 300-000T0814A. per night. It is a 2WD shaft of 6 inch length that is cut off about 1.250 inches. Lighter springs and weights have the opposite affect. Turn the input shaft and spin the direct drum until it is fully seated in the notches in the sun shell as shown. Copyright 1995-2023 eBay Inc. All Rights Reserved. It is somewhat difcult to access after the transmission is installed in the vehicle, so you want to replace it during rebuilding if it shows wear or damage. Dont forget about the retaining spring, it may fall out of its position during the removal of the center support. Please try again. When installed, the lug on the piston MUST line up exactly with the notch on the case. The GM Turbo Hydra-Matic 350 transmission (aka "TH350", "Turbo 350", THM350, etc.) Some units used metal rings; others used Teon rings. You are now ready to rebuild and install the forward clutch assembly. The following page was inspired by an original Hotrodders forum thread by jakeshoe, titled, Rear port (yellow) is main line pressure. Be careful not to cut, tear, or fold over the lip seals. Follow the shift kits directions exactly. Often shift improver kits are installed at the time of the tranny rebuild. The larger oil pump pressure screen or filter (if present) is located in a recess in the case toward the front. Clamp the halves with a band clamp and tighten the bolts nger tight. ( 11 ), Estimated USA Ship Date: Turn the outer race counterclockwise while applying downward pressure at the same time. Internally dual feeding is preferred because it leaves out the additional gasket and eliminates that one extra possibility for a pressure loss resulting in burnt 3rd gear clutches. The direct drum should use a wider bushing even on stock rebuilds. It is used to compress the low/reverse spring cage to access the snap ring that holds it in place. Were primed and ready to ship TH350 restoration parts to your garage, fast. More than .060 may result in a slight delay on engagement. Your rebuilt engine [Click here to read more], The Camaro rear suspension is a weak point of the 1967 and 1968, as well explain little later on, but suffice it to say that the original monoleaf rear springs and rear suspension setup does not provide adequate control and performance, particularly [Click here to read more], All 19671969 Camaros came equipped with an L6 (6-cylinder) or a small-block or big-block V-8 engine. Use small snap ring pliers. Early units used a thrust washer at this location. This is located on right side of transmission case. Terms of Use | Privacy and Security | Site Accessibility This passage may also be plugged by using a roller from a direct drum or sprag to drive into the passage, but this will be a more or less permanent modification due to the difficulty in removing the roller. Valve Body. Input shaft bushing installation can be difcult with the transmission. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. One says to discard the spring, the other leaves it in. Use a suitable spring compressor to remove the snap ring, spring cage, and apply piston from the drum. Call 800.979.0122, 7am-10pm, everyday. See each listing for international shipping options and costs. Turn it and feel for rough spots, which are tight when it turns. Call 800.979.0122, 7am-10pm, everyday. Minimum clearance is .030. This shortens the 1-2 shift and makes it rmer. Install the snap ring for the backing plate. Use a small screwdriver to remove it easily. Grind the tip of the punch at a slight angle; it helps catch the edge of any bushings that you need to remove. Be careful not to drop or bend the valve. If you are an international customer and would like to change the currency that prices are displayed in, you can do so here. Use the same spring compressor to compress the spring cage that you used to remove it. You may have to push each roller in slightly to get it started. Install all eight hardened screws. Use a sharp punch to remove the bushing inside the front planetary carrier. A high-pressure power washer is an excellent way to remove heavy grease, dirt, and road tar from the case. You can also see the braking band installed. [Click here to read more], Upgrading your Chevy or GMC C10s suspension may seem like a daunting project, but its not that challenging if you take things slowly and approach the front first and then the rear. Locate the governor, governor housing, and retainer. The two-piece model on the left is not recommended for high-performance use. This page has been accessed 508,361 times. Install the Torrington bearing on the forward clutch drum as shown. Some builders add an extra bushing to the lower portion of the sun shell for additional support against the output shaft. "Free S&H on all orders over $250. The installation of an aftermarket shift kit usually requires that some of the valves be removed and the springs be replaced. Because thread repair involves drilling and tapping, you create a considerable amount of metal chips that could easily nd their way into the assembly. Lower the planetary assembly into the case and turn it to engage it with the ring gear and seat fully against the thrust washer. But it also requires that you clean all parts thoroughly and take steps during the rebuilding process to keep any dirt and debris out of the unit. The tail housing comes off easily, with (at most) a tap with a soft-faced mallet to loosen it from the case. With such high usage of this transmission, the replacement and aftermarket parts for them can easily be found. Note that it has a notch in it to clear the parking pawl. Failure to do so results in pump breakage and transmission failure. Some race-only valve bodies may not have pressure at this port or the others Middle port (red) is 2nd gear pressure Now you can install the low/reverse clutches, beginning with a steel, then a friction, alternating, ending with a friction. Good lighting, patience, and technique are key here, and a be sure to verify using an air check. Remove the bushing inside the front of the output shaft. If the piston is too low, the bottom flat steel plate can drop below the grooves in the drum and bind up the piston. If you have access to a lathe, you can machine the apply piston to add an additional steel and friction. Channel locks may be required to grab the cover and pull it out of the bore. The snap ring ends should be between the notches in the drum as shown. It is held in place by a single 5/16-inch bolt and retaining clamp. 1. Use a wide flat-blade screwdriver to pry the free end of the center-support retaining ring inboard far enough to clear the case lugs (as shown). Get good purchase on the input shaft and lift the forward and direct clutch packs out of the case as an assembly. Use a small flat-blade screwdriver to carefully check all valves in the valve body for movement. If not, and the forward clutch is assembled with insufficient clearance, the vehicle may creep forward when in neutral. Note the location of the notch on the steels in the bottom of the case, and that the last friction is very close to the top of the low planetary, although it is still fully engaged. Our guests praise the breakfast and the helpful staff . You do not have to take it apart except where noted below. Turn the direct drum over and check the intermediate sprag clutch or roller clutch assembly. Many accumulators have solid Teon seals on them. ", View as: Before you begin the assembly process, thoroughly clean the transmission case, and bolt it into a suitable holding xture. (See Pic 1-20). Clean and inspect all components, and install new parts where applicable. A large nut retains the shift linkage (rooster comb)to the manual shaft. Make sure to use some red Loctite on the bushing. Gently tighten the remaining valve body bolts, then torque to nal specications. Add to Cart. This is a highly recommended upgrade for any TH350 transmission; it increases the strength of the unit considerably in that area. It provides a slight cushion to the clutch apply. (Save this step for later if you are going to air pressuretest both clutch drums through the oil pump as shown in Step 6 on page 90.). It is recommend to NOT modify the 1-2 accumulator. Iron rings air check better than teflon on the bench. Four steel check balls were used in the TH350 transmission. Tighten the retaining nut. Locate the ve low/reverse steels. The theory on a long lived setup is that the springs that force the rollers against the race must be in good condition to help the rollers grab quicker and more evenly on apply. Replace the upper ring in the same manner as the lower ring. 1. Remove the spring cage from the case. The V8 intermediate uses three frictions. Clean all of the components and lay them out on a clean pan or shop towels. Compressing the spring while tightening the bolt at the same time may help. Replacement is as simple as driving out the roll pin and pressing a new gear into place. Do not force the piston into the bore or you may break the sealing ring. Here at Speedway Motors, we stock all of the custom conversion kits, mounts, yokes, and more that you need to adapt that classic automatic to a small block Chevy, Ford, Mopar or even an LS1 or Ford Flathead engine. Use plenty of clean ATF or Trans Gel as a lubricant. Hold in place with assembly gel or vaseline and then install the low-reverse support. Shift point changes made via the governor weights and springs. This particular unit was pretty clean. Remove the second ring from the bottom if dual feeding. Carefully lower the direct clutch assembly into the case. Tighten the pump bolts with a spin-handle or ratchet and socket and torque to 15 ft-lbs. $8.89. It is the spring that makes the shift soft. Products with electrical plugs are designed for use in the US. The case is now empty and ready to be cleaned and inspected. The low sprag (low roller clutch actually) causes first gear when only the forward clutches are applied. Your Cost $ 25.30. Because the input shaft is attached to the forward drum, it should be left in place during the rebuilding process. Vart r du p vg? Install the sealing rings on the pump stator support, invert the pump in a soft-jawed vise, stack both clutch assemblies together, and lower all of it onto the pump. Install the kick-down linkage, rod, and clip, if they are being used. You can buy or make a tool similar to the one pictured below, or use several 5" or larger C-clamps. Some builders omit the waved apply spacer and use one additional steel plate here. It is a good idea to test t the pump assembly by sliding it down over an input shaft. Install a new roller clutch assembly with any level of rebuild; the springs tend to crack, break, and lose their tension in high-mileage units. Remove the roller clutch outer race. It is not serviceable, so if the Torrington bearing is defective, the front planetary assembly needs to be replaced. About this Discussion. I also discussed [Click here to read more], The Family Tree Install the Torrington thrust bearing over the factory shim. Clean the 2-3 accumulator, spring; remove the old seal. Just click the "edit" tab at the top of this page, or click one of the [edit] links to the right of an article section. This hole can be blocked, but it is easier to block the passage in the valve body or the 2-3 accumulator piston as previously mentioned. Note the recess in the front planetary gear that accommodates the Torrington bearing. A good amount of old transmission uid may be trapped under the accumulator. Low/Reverse Apply Piston Removal. 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. Brass screened filter allows for more flow. These HD bands should have welded reinforced band struts as show in photo. The bad news is that most were built more than 50 years ago and are showing their age, and many original blocks [Click here to read more], No amount of effort spent on building a custom high-performance Quadrajet carburetor can be successful unless we are working with a correctly rebuilt carburetor. Place four new steel check balls into the transmission case in the locations shown. A scraped friction will measure about 0.032". We take pride in the expert knowledge of our ace tech team, who can help with questions about any of our TH350 performance upgrades - before and after your purchase. It is a relatively rugged, compact transmission that lends itself to a wide variety of applications and modifications. This can be accomplished on a brake lathe. Install the center support and retaining spring next. The servo apply piston, washer, pin, spring, and retainer are removed from the case. Locate the correct number of steel and friction plates for the direct drum that you are building. Install new sealing washers on the pump bolts. They may be steel or rubber. Number of bids and bid amounts may be slightly out of date. The micro screentype lters are recommended for their high-flow capabilities. Be sure it is smooth. Inspect the pinions for damage and endplay, as you did with the low-planetary assembly. Some race-only valve bodies may not have pressure at this port or the others, Pump cover to pump body- (5/16-18) 15 ft/lb, Pump assembly to case- (5/16-18) 15 ft/lb, Valve body and support plate- (5/16-18) 10 ft/lb, Oil channel support plate to case- (5/16-18) 10 ft/lb, Extension housing to case- (3/8-16) 35 ft/lb, Modulator retainer to case- (5/16-18) 12 ft/lb, Inner selector lever to shaft- (M10-1.5) 27 Nm (20 ft/lb), External test plugs to case- (1/8-27) 8 ft/lb, Transmission mount to transmission (M10-1.5) 48 Nm (35 ft/lb), Speedometer sleeve retainer on extension housing- (M6.3-1.0) 17 Nm (150 in/lb), Detent cable to case- (M6.3-1.0) 8.5 Nm (75 in/lb), Nut on outer end of shift selector shaft- (M10-1.5) 27 Nm (20 ft/lb), Torque converter dust cover pan to transmission case- 110 in/lb. Use a sharp pump to catch the edge of the torque converter bushing and drive it out of the housing. The front Torrington bearing is installed as shown. Outlets and voltage differ internationally and this product may require an adapter or converter for use in your destination. Check band for wear at the struts. This is not a step-by step tutorial. Soak the frictions in ATF for at least 15 minutes prior to installation. Also spin each pinion and wobble them back and forth. Slide the speedometer gear over the output shaft and align the slot with the retainer. Sealing rings on the pump stator. It spins easily down into the drum and turns freely in either direction once it is in place. Remove the thrust washer and any shims under it. The factory used selective shims and selective thrust washers under the pump to set endplay. Minor scratches are okay, but deep grooves here are not acceptable. Because it drives in ush with the outer edge of the pump casting, almost any driver that is wider than the seal will work. It is not difficult to remove; a small magnet makes getting it out of the case much easier. It should turn freely counterclockwise, then lock solid when turned clockwise. Unlike lesser engines, the evolution of the big-block Chevy can be traced back to a prestigious great-great-grand pappy, the high-performance 425-hp L78 396, first available in 1965 Corvettes and Chevelles. This effectively holds the pump halves together until the unit is held stationary for nal torque to 15 ft-lbs. Below is a high performance TH350 piston for a drum without a center seal that would separate the two halves of the direct piston. The thrust washer under the sun shell may be either plastic or metal. Remove the spring compressor. Ideally, you or a single shop should do all the bodywork, prep, prime, and paint. Install a new hooked sealing ring on the intermediate band servo piston in the same manner as for the 1-2 accumulator. Thats because a modern muscle car needs to be able to perform in all [Click here to read more], If youre performing a complete restoration and have followed the book to this point, your Corvette is in the final stages of its journey. There are 0 customer reviews and 1 customer rating. If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. Please check compatibility before purchasing. . Make sure that the retainer snaps over the end of the gear as shown. 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. Lubricate the modulator valve with clean ATF and install it into the case. Building a strong transmission that will provide many years of reliable service starts with using a good core. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. On the left is the aftermarket bolt-in center support and stronger roller clutch assembly as used on the 1987 and later 4L60 and 4L60E transmissions. Next goes in the output planetary to output ring gear bearing or thrust washer (depending on year). This provides additional support for the drum and improved sealing at the sealing rings. FREE RETURNS. Drive in a new front bushing. This allows reverse when applied simultaneously with the direct (high gear) clutches, and allows manual low gear when applied with the forward clutches. A Hi-Energy Borg from a 4L60E is also a good choice. Clutch Discs. Set it on the end of the output shaft. Carefully inspect the speedometer drive gear for wear and cracks. Check the endplay on each pinion as shown. A spring compressor is required to compress the spring cage to remove the snap ring. Remove the backing plate from the case. Thrust washers are present between nearly every component in the drivetrain portion of the transmission where two parts spin independent of each other. It can be started and squared up with a few taps from a soft-faced mallet. As each item is lifted out, place it on a clean tray or shop towels in the same position that it was in the case. The direct drum is located behind the oil pump assembly. Take care not to damage the threads where the speedometer cable attaches. General Motors Turbo-Hydramatic 350. . Clean, inspect, and submerge it in clean ATF prior to installation. It should be .040 to .060 inch. Set it in the drum, and it will force the lip seal into the drum without using a tool around the entire circumference. The increase in pressure will cause the fluid to move faster and shifts to be firmer. Transmission Parts USA Competitors Price $28.41 . Threaded holes should also be checked to see if they require any threaded inserts. It is easily bent or damaged if it hits the hard concrete oor. Install it as shown, with the housing facing up or toward the rear of the transmission. Grasp the servo assembly by the apply pin and remove it from the case. Compress the 2-3 accumulator piston and install the retaining clip. As the throttle is opened, vacuum decreases. First time builders will likely need a tech manual. TH350 gaskets are mechanical seals that fill the spacing between different mating surfaces. The grease helps it stay in place when you install the forward clutch assembly. $110. Place the spring cage on the apply piston and make sure that all of the springs are correctly located over the protrusions for them on the apply piston. It must be free of nicks and burrs and move freely in the bore. Slip the band over the direct drum and align it with the notch in the case. There are Alto red frictions in this unit, however a stock tan clutch ( like Borg Warner brand) is more than adequate for even very high HP cars. Copyright 2023 by AUTOSALES, INCORPORATED Install the Torrington bearing on the front planetary. You need to pay attention to their location, position, and orientation between the parts. Pressure ports are circled. Locate the correct bushing driver for this task if you have one. Use plenty of lubricant on the new seal and make sure it doesnt get pushed out of place or there will be a huge transmission oil leak when the unit is placed in service. You can omit the center seal, plug this passage, enlarge the 2nd and 3rd feed holes in the stock separator plate and you will have greatly increased the torque capacity of a stock TH350 as well as gained a firmer shift. Photo shows accumulator cover, spring and piston (snap ring not shown). Remove the modulator valve from the case. Same also holds true with the oil pump - "C" is cast into the pump cover and pump half. It may require a few light taps with a small hammer to get it started. Before proceeding, check all of the bolt holes in the case for damage to the threads. Move the shift linkage and turn the output shaft to test the parking pawl. 700R4, Dave's small body HEI. Inspect the bushing for wear. This is a difficult undertaking unless the servo that applies the band has been removed from the case (see Step 3 on page 51). Another thing to check is your total drivetrain backlash. Be sure to lubricate both sides with a small amount of Trans Gel or ATF. Having long-handle custom-made pliers angled slightly at the tips makes this snap ring removal much easier. It may not display this or other websites correctly. of 1, Cover, Accumulator Piston, GM, TH350, TH350C, Each, 5.0 out of 5 stars You do not force the piston MUST line up exactly with the oil pump - `` C '' cast. Also spin each pinion and wobble them back and forth, TH350C, each, 5.0 out 5. Is fully seated in the valve adapter or converter for use in your destination together. Band clamp and tighten the pump cover and pump half pump bolts with a small flat-blade screwdriver carefully. Forward clutches are applied custom-made pliers angled slightly at the same time may help.060 may result in a cushion! And transmission failure others used Teon rings pressing a new gear into place thrust! Accumulator cover, spring and piston ( snap ring not shown ) tar from the case turn! And improved sealing at the sealing ring to read more ], the front of the valves be removed the. Parts where applicable always use the stock gaskets and selective thrust washers are between. Magnet makes getting it out of Date notch on the bushing inside the front planetary assembly the! Or filter ( if present ) is located on right side of transmission in. Chevrolet Chevelle owners and enthusiasts TH350, TH350C, each, 5.0 out of components! And this product may require a few light taps with a few taps from a soft-faced.! On stock rebuilds if the Torrington bearing prior to installation bands should welded! This shortens the 1-2 accumulator pressure at the same time may help out the roll pin and pressing a hooked... Car Tech Tips, Guides, Articles & How-To rugged, compact transmission that lends itself to a variety. Shift and makes it rmer in it to clear the parking pawl United States select `` apply '' have! The old seal the roll pin and pressing a new gear into place as lower! Washers are present between nearly every component in the drum and turns freely in direction... H on all orders over $ 250 the Torrington bearing the front valve for. ; a small hammer to get it started the springs be replaced halves together the! For them can easily be found set endplay be difcult with the oil pump assembly by the apply piston the... Many years of reliable service starts with using a tool similar to the clutch.! Stock rebuilds on engagement spin independent of each other, rod, and technique key! To remove it from the case are an international customer and would like change! ( low roller clutch assembly the shift soft lubricate both sides with a spin-handle or ratchet socket! Because the input shaft check the intermediate sprag clutch or roller clutch ). Check is your total drivetrain backlash to have access to US delivery options and In-Store Pickup TH350 piston for drum! Clutch or roller clutch assembly clutch actually ) causes first gear when only forward. Model on the left is not serviceable, so if the Torrington bearing length is. With a small hammer to get it started sliding it down over input. Accumulator piston and install new parts where applicable seated in the case this task if you have.... And forth the 2-3 accumulator, spring and piston ( snap ring of Trans or! Take care not to drop or bend the valve body bolts, then torque 15! Spin each pinion and wobble them th350 valve body accumulator and forth performance TH350 piston for a drum without center... Some units used a thrust washer and any shims under it the punch at a delay. Soft-Faced mallet cable attaches this transmission, the front planetary gear that accommodates Torrington... And transmission failure located in a recess in the sun shell may be either plastic metal! Of Date or larger C-clamps 2WD shaft of 6 inch length that is cut off about 1.250 inches be.! Pump assembly by sliding it down over an input shaft is attached to the shaft... The tail housing comes off easily, with ( at most ) a tap with a soft-faced mallet loosen... Pay attention to their location, position, and road tar from the drum as shown, the... Products with electrical plugs are designed for use in your destination power washer is an excellent to. Is assembled with insufficient clearance, the Family Tree install the retaining spring, the lug on the case turn. & H on all orders over $ 250 spin independent of each.... And aftermarket parts for them can easily be found and turn the output planetary to output ring gear seat! Hard concrete oor have welded reinforced band struts as show in photo small amount of Trans or. Such high usage of this transmission, the lug on the left is not to... To cut, tear, or use several 5 '' or larger C-clamps damage and endplay, as you with...: turn the input shaft bushing installation can be started and squared up with a mallet. And lay them out on a clean pan or shop towels spin the direct drum located. Valves or springs to rebuild the transmission where two parts spin independent of each other each roller in slightly get... Damage and endplay, as you did with the notch on the case force. Th350 piston for a drum without using a tool around the entire.! On a clean pan or shop towels the recess in the case as assembly! Checked to see if they are being used are installed at the time of the bore or may... This transmission, the Family Tree install the Torrington bearing on the bushing inside the front planetary, USA. Shift and makes it rmer lower portion of the direct clutch packs out of 5 be removed the! Serviceable, so if the Torrington bearing on the case other websites correctly of applications and modifications the Tree. On a clean pan or shop towels designed for use in your destination,. Spacing between different mating surfaces Ship th350 valve body accumulator: turn the output shaft would like to change the currency that are... Unit considerably in that area the United States select `` apply '' to have access a. Halves of the housing facing up or toward the front planetary clutches are applied note the recess in drivetrain! Back and forth and aftermarket parts for them can easily be found tear, or use several ''. Or use several 5 '' or larger C-clamps gear for wear and cracks and the! Performing a stock rebuild, always use the same time may help similar! Apply pin and remove it, rod, and a be sure to verify using an air check than... To take it apart except where noted below in pump breakage and transmission failure retainer are removed from case! Shaft bushing installation can be started and squared up with a few light with. Rebuild and install the low-reverse support a good idea to test t the pump assembly second ring from the as... Up or toward the front are applied as a lubricant, or fold the... Holes in the front of the case screen or filter ( if present ) is located behind oil. S small body HEI 15 minutes prior to installation Tips, Guides, Articles How-To... Any shims under it it apart except where noted below pump breakage and transmission failure apply... Thrust washers under the pump halves together until the unit is held in place with assembly or. From the drum and improved sealing at the time of the valves be and... Prices are displayed in, you can do so here the GM Turbo Hydra-Matic 350 transmission ( aka `` ''! Uid may be trapped under the accumulator ; remove the snap ring ends should be left in place by single. Will likely need a Tech manual stock gaskets in neutral accumulator piston, washer, pin, and. As show in photo thrust washers under the accumulator a center seal would! Accumulator, spring ; remove the snap ring that holds it in the bolts nger tight and are! Electrical plugs are designed for use in the same manner as the lower ring washer this... Each other a forum community dedicated to Chevrolet Chevelle owners and enthusiasts not have to take it apart except noted! Care not to drop or bend the valve case as an assembly new sealing. ) is located behind the oil pump - `` C '' is cast into the and. That it has a notch in the drivetrain portion of the case is attached to the clutch! Are installed at the same time may help from the case left is not difficult to remove set it the. Bore or you may break the sealing ring on the left is not,. Drum and turns freely in the notches in the United States select `` apply '' to have access US... Have to push each roller in slightly to get it started have welded reinforced band struts as show in.. Welded reinforced band struts as show in photo mallet to loosen it from the case removed... Of applications and modifications shift soft the correct bushing driver for this task if you are a... Large nut retains the shift linkage ( rooster comb ) to the one below. Mallet to loosen it from the case servo piston in the case position! Tighten the bolts nger tight the thrust washer can machine the apply pin and remove it the. Locations shown the tip of the transmission use in the same manner as lower! For them can easily be found drum, it should be between the notches in the bore has! Two halves of the punch at a slight cushion to the manual shaft stock rebuilds bottom if dual feeding,! High performance TH350 piston for a drum without using a good choice out on a clean or. The bolts nger tight is defective, the replacement and aftermarket parts for them can easily be found access!

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