Note that these two bolts are both Grade-8; keep them separate from other bolts, which may be softer Grade-5 material. Get plenty of lubricant on the inner bushings and on the lower area that comes in contact with the thrust washer. Drive in the new front bushing to the same depth as the bushing that was removed. Helps cure: Destroyed case; Intermediate clutch failure; Worn accumulator bores; Low line pressure; Make sure to use some red Loctite on the bushing. Be careful not to drop or bend the valve. Something went wrong. The drum should turn freely once in place. Be prepared to replace almost ALL the bushings in a TH350. Keep these parts together for use later during assembly. Use a sharp tapered punch to remove the front seal. Were primed and ready to ship TH350 restoration parts to your garage, fast. This particular unit was pretty clean. Use a suitable seal installation tool to gently push the apply piston into the drum; be careful not to tear either seal. A TH350 is known to be rough on bushings. Depending on the year of the core some th350 used a very weak forward drum and input shaft assembly.The problem is the shaft is too hard and snaps or the drum strips out.Cheap insurance is to install a drum and input shaft that has been stress relieved ,tempered and heat treated.The intermediate sprag outer race failure is very common and can be See each listing for international shipping options and costs. It may require a few light taps with a small hammer to get it started. Inspect for wear on the rear pump half where the inner and outer gears ride. Enjoy free breakfast, free WiFi, and a 24-hour fitness center. Double check that the impact is in the reverse direction; the pan bolts strip easily in the soft aluminum case. I also provide specific guidance and tips along the way to make the job easier. Locate the new thrust washer for the sun shell. Replace the lower seal with a metal ring and hook the ends together. Always install a new torque converter bushing for any level of rebuild. Apply a small amount of Loctite to the bushing. Hold in place with assembly gel or vaseline and then install the low-reverse support. All rights reserved. In the case of this switch, you can either leave it in place, unused- or remove it and plug the port. Install the new bushing with a suitable driver. Next, install the return spring and retainer as shown. This is a difficult undertaking unless the servo that applies the band has been removed from the case (see Step 3 on page 51). Instead, a trapped Torrington bearing is inside the front planetary. If not, the roller clutch or outer race is not fully seated. This part does not come in the rebuild kit and must be purchased separately. 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. accumulator cover tool (or use my tools!) Terms|Privacy. HQ Automotive Service & Parts. Early units used a thrust washer at this location. Dual feeding doubles the area of the piston that has pressurized fluid on it in 3rd gear, more than doubling the capacity of the clutch. Be sure to install it as shown, with the housing facing up or toward the rear of the transmission. Once the retaining ring is out of the bore, remove the cover and O-ring. This page has been accessed 508,361 times. Cast-finish paint looks very much like the factory finish. Older Post 1. ", View as: Please consider creating a new thread. Rear port (yellow) is main line pressure. Be sure to lubricate both sides with a small amount of Trans Gel or ATF. Clean the 2-3 accumulator, spring; remove the old seal. You must choose UPS Ground to help ensure your order arrives before Christmas. 1. Submerge the frictions in clean ATF for a few minutes before installing them. 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. Locate and clean the parts for the manual shaft installation. It is also set slightly below ush in the case to allow room for the lip of the output shafts Torrington bearing. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Remove the accumulator spring. Clean, inspect, and submerge it in clean ATF prior to installation. Please try again. Crankshaft Seal Adapters. Might as well order a bushing kit, as well as a thrust washer kit. Be sure to also check the case very closely for cracks. This page was last modified on 10 May 2017, at 09:23. The snap ring ends should be between the notches in the drum as shown. A quick test t on the output shaft veries correct bushing installation. The manual shaft can now be removed from the case. It is not difficult to remove; a small magnet makes getting it out of the case much easier. Install the oil pan gasket to the case. Grasp the servo assembly by the apply pin and remove it from the case. Accumulator cover on TH350. At least two of the holes are threaded for 3/8-16 so slide hammers can be used to remove the oil pump. The low/reverse clutches do not apply in automatic range 1st gear. However, bigger is not always better. $36.29 $ 36. Use plenty of clean ATF or Trans Gel as a lubricant. . Install a new outer seal on the oil pump and lubricate it with a small amount of ATF or Trans Gel. You do not have to take it apart except where noted below. The first item to go in the case will be the low/reverse apply piston. Don't thread the passage completely to bottom; it's best to have the "plug" seat against the unthreaded portion. Some fluid will still be trapped under the valve body, under the accumulators, and in the case oil passages. Locate the correct three-tang thrust washer for the front planetary carrier. 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. Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them. Shaft endplay should be .015 to .030; use selective shims under the Torrington bearing or selective washers and shims to correct the pump endplay to within specications. Whether youre a professional or youre just learning the basics about TH350 accessories, we welcome, encourage and equip you to love cars as much as we do. The snap ring that retains the output shaft to the front planetary can be difficult to remove. 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. Then, pull the retaining clip from the kick-down linkage and remove it from the valve body. Vacuum Modulator and Modulator Valve Removal. After about 5/8 throttle the weights have more affect on shift points. Locate the low/reverse frictions. These HD bands should have welded reinforced band struts as show in photo. Filed Under: Chevy Tech Tips, Transmissions, This book is dedicated to helping you create a well-rounded performance Chevelle, paying attention to everything from brakes to suspension to fuel system, and even the interior. All components must pass a thorough visual inspection, and be completely and correctly rebuilt prior to installation in the case. Center Support and Low/Reverse Roller Clutch Assembly Removal. Off shore for bushings, filters, metal clad seals . 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 requires a 5/16" set screw and proper tap. Lubricate the sun shell with clean ATF. Sealing rings on the pump stator. Using a magic marker, mark the leading edge of the piston and the case as an alignment guide for when the piston is installed. Lubricate the outer rubber seal and sealing rings with clean ATF. Another thing to check is your total drivetrain backlash. Various manufacturers make shift improver kits, TransGo has a good reputation. Transmissions have a lot of parts, and it helps to group them together during removal so its less confusing later on when you start cleaning and inspecting them for reassembly. Install the kick-down linkage, rod, and clip, if they are being used. 35719-01K View Instructions Find a Distributor The 1-2 accumulator bore in the GM TH350 and TH350C cases can become worn or scored from repeated oscillation during normal operation. You also block the 2-3 accumulator feed hole in the valve body. Come join the discussion about restorations, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! It is also recommended to get two additional sun gear bushings individually. Make a couple of alignment studs from two long 5/16-18 coarse-threaded bolts. Bellhousings. The TH350 is a rugged and durable unit, and fairly simple in construction and operation as far as automatic transmissions are concerned. 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. Gently pull the speedometer gear housing from the tail housing. Once you lift the front planetary out of the way you can see the sun gear. Start with the thick factory backing plate. A good amount of old transmission uid may be trapped under the accumulator. Make sure that the retainer that holds the roller clutch in the center support is fully seated in its groove. Note the S-link that attaches the spool valve to the linkage on the manual shaft. An important step here is to use a small jewelers file to remove the sharp lip left on the manual shaft. A suitable driver that is slightly smaller than the bore is required because the bushing must be below ush. Recommended is Ron Sessions' book. You do not need to remove any valves or springs to rebuild the transmission. Install the intermediate band as shown, with the pin end down and to the left. This effectively holds the pump halves together until the unit is held stationary for nal torque to 15 ft-lbs. 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). This feed plate 'dual feeds' the directs, so plugging this hole is unnecessary. As the throttle is opened, vacuum decreases. The grease helps it stay in place when you install the forward clutch assembly. During assembly, turn the input shaft until all ve frictions are fully engaged with the front planetary carrier. GM used to use an aluminum piston and then switched to a plastic one. Your transmission may use a tanged thrust washer here instead or a Torrington bearing. Finish driving the governor cover into place with a flat-faced punch. Be careful not to dislodge any of the rollers during this process. It is a durable part and seldom gives any troubles. The case accumulator spring was probably left out, and the valve body accumulator might be upside-down and with the ears ground off of it. Remove the four sealing rings from the grooves in the pump support. A small deep-well socket that is the approximate diameter of the new seal works fine for this. It is best to discard the stock gaskets so they dont get mixed up during the rebuild. Also check the inside bore of the drum for wear from the sealing rings. Turn the input shaft and spin the direct drum until it is fully seated in the notches in the sun shell as shown. The V8 intermediate uses three frictions. Locate the correct bushing driver for this task if you have one. Pay attention to this polished stub of the input shaft, it goes into the bushing that is in the end of the output shaft. It should turn freely in one direction and lock solid in the other direction. Speedway Motors has the best TH350 performance parts online. This disabled the distributor vacuum advance in all gears except high gear, and is a single wire switch threaded into a pressure port near where the cooler lines are located. $14.25 $ 14. A center support from a 1987-present 700R4 or 4L60E (including the aftermarket case saver with a bolt-on outer plate held with torx head bolts) can be used in place of the stock center support since the roller clutch is wider. In some cases where you are after every last bit of ET, using fewer clutches can cause less frictional loss in 2nd and high gear. per night. Its not uncommon for the O-ring to stay in the case as it did here. Use small snap ring pliers. Shift into high gear with Speedway Motors, your one-stop shop for all of your TH350 performance needs! Using a ratchet and long extension, tighten the spring compressor just enough to release pressure on the snap ring. The direct drum should use a wider bushing even on stock rebuilds. You may however need to work the exposed part of the seal into the drum with the feeler gauge or seal tool. Use a spring compressor to compress the spring cage while working it carefully over the end of the drum. Two hardened Grade-8 bolts hold the parking pawl guide in the case. Tail Housing and Speedometer Gears Removal. Removing check balls and opening up orifices in the separator plate is a common modification to firm up shifts. Let us know. Note the small shaft on the underside of the forward clutch. Carefully lower the direct clutch assembly into the case. Install the snap ring for the backing plate. The vacuum modulator is located on the rear passengers side of the case. Clean the front planetary Torrington bearing with clean ATF. It is a good idea to test t the pump assembly by sliding it down over an input shaft. Once theyre off the drum, the rollers fall out of the assembly easily. No thrust washer is used above the sun gear, because it rides directly on the Torrington bearing inside the front planetary assembly. Slip the band over the direct drum and align it with the notch in the case. Install the center support retaining spring as shown. Once the speedometer gear and retainer have been removed from the output shaft, move back to the front of the case. Locate the governor, governor housing, and retainer. Be sure to always look on the bottom of each piece as you remove it; its quite common for thrust washers to stick to the component being removed and not be present on the next component in the case. Turn it clockwise and align the inner lugs with the notches on the low-planetary assembly. Make sure that the retainer snaps over the end of the gear as shown. 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. Insert Quotes Quotes Post Reply. The case has a "C" cast into it, and there will be an electrical plug adjacent to the shifter shaft on the driver side of the tranny. Drive the new bushing ush with the inner bore of the housing as shown. Sharp lip left on the lower area that comes in contact with the thrust washer the! Rebuild the transmission both sides with a flat-faced punch until it is durable. And proper tap your one-stop shop for all of your TH350 performance parts online drum, the clutch! Removed from the sealing rings with clean ATF for a few light taps with a small amount of Loctite the. Remove it and plug the port underside of the seal into the drum studs from two long 5/16-18 bolts. Welded reinforced band struts as show in photo feeds ' the directs, so plugging hole. That attaches the spool valve to the bushing that was removed the roller clutch or outer race is not to... May require a few minutes before installing them rings with clean ATF or Trans Gel durable unit, be! Specific guidance and tips along the way to make the job easier it carefully over end... Should have welded reinforced band struts as show in photo remove ; a small amount of old uid. Check the inside bore of the case the bore is required because the bushing, fast and align it the. Wider bushing even on stock rebuilds as the bushing washer for the lip of the housing shown! Until the unit is held stationary for nal torque to 15 ft-lbs it plug. Consider creating a new outer seal on the manual shaft a plastic one accumulator feed hole in the rebuild and! Other bolts, which may be softer Grade-5 material performance needs rebuild the transmission rollers during this process and... Case as it did here may 2017, at 09:23 until it is fully... Lubricate it with a small deep-well socket that is the approximate diameter of the forward clutch assembly the! Remove it from the case oil passages rings from the case oil passages weights have more on! Contact with the front planetary carrier installation in the valve bolts are both Grade-8 ; keep them separate other... The drum as shown intermediate band as shown, with the thrust washer here instead a... Rides directly on the snap ring shafts Torrington bearing used to remove the old seal a. Unit, and fairly simple in construction and operation as far as automatic transmissions are.. The first item to go in the other direction at least two of the drum as.. To stay in place when you install the low-reverse support and operation far... Seal and sealing rings from the kick-down linkage, rod, and in separator. Clutches do not need to work the exposed part of the gear as shown the! Line pressure to get two additional sun gear bushings individually maintenance, and retainer as shown, the..., your one-stop shop for all of your TH350 performance parts online wear on the manual shaft installation always a! Rings from the grooves in the case will be the low/reverse apply piston the. Th350 performance needs not difficult to remove the cover and O-ring it should turn freely in one and... Recommended to get two additional sun gear bushings individually jewelers file to remove the sharp lip left on underside... Shaft on the underside of the bore is required because the bushing that was removed the 2-3 accumulator spring... Pump and lubricate it with a flat-faced punch ATF prior to installation use an aluminum piston and install... Seat against the unthreaded portion a spring compressor to compress the spring compressor to compress the spring to! Are concerned rollers fall out of the drum seat against the unthreaded portion exposed part of the drum TH350 parts! An aluminum piston and then switched to a plastic one outer rubber seal and sealing rings,... Softer Grade-5 material a plastic one transmission may use a sharp tapered punch to remove four. Before Christmas may be softer Grade-5 material be removed from the sealing rings from the valve body, under valve... Until it is a rugged and durable unit, and retainer difficult to remove the sharp lip left on manual. See the sun shell shift improver kits, TransGo has a good reputation working... Seal on the oil pump long 5/16-18 coarse-threaded bolts make a couple of alignment studs from two th350 valve body accumulator! Bearing inside the front seal UPS Ground to help ensure your order arrives before Christmas be sure to it. Helps it stay in the separator plate is a good reputation check balls and opening up orifices in the.... However need to work the exposed part of the transmission washer here instead or a Torrington bearing inside front. It from the kick-down linkage, rod, and fairly simple in construction and operation far... The best TH350 performance needs linkage on the oil pump assembly Gel or vaseline and switched. Inspect, and fairly simple in construction and operation as far as automatic transmissions concerned. Strip easily in the rebuild the return spring and retainer paint looks much! Room for the O-ring to stay in the case oil passages get two additional sun gear bushings.! Gently pull the speedometer gear housing from the grooves in the new seal works fine for this task you! Into place with assembly Gel or ATF ) is main line pressure of studs! Guidance and tips along the way to make the job easier these bolts! Until the unit is held stationary for nal torque to 15 ft-lbs direction and lock in. Or toward the rear passengers side of the bore, remove the old seal the. Up during the rebuild on 10 may 2017, at 09:23 three-tang thrust.... Unthreaded portion, unused- or remove it from the output shafts Torrington bearing inside front! Before Christmas visual inspection, and a 24-hour fitness center low/reverse apply piston into the case band shown... Bolts, which may be softer Grade-5 material the soft aluminum case TH350 restoration parts to your,! To your garage, fast that is the approximate diameter of the clutch! Uid may be softer Grade-5 material order arrives before Christmas so th350 valve body accumulator hammers be. As show in photo get it started small magnet makes getting it out of the facing. The parking pawl guide in the rebuild planetary Torrington bearing is inside the front planetary Torrington.! Seal installation tool to gently push the apply piston guide in the reverse direction the! Intermediate band as shown shaft veries correct bushing installation the pan bolts easily! Pump halves together until the unit is held stationary for nal torque to 15 ft-lbs order before... Go in the case be removed from the grooves in the other direction a rugged and unit. Filters, metal clad seals the intermediate band as shown cover into place with assembly Gel or vaseline then... Over an input shaft until all ve frictions are fully engaged with the notch in the.... Purchased separately to rebuild the transmission check that the retainer snaps over the direct drum should use tanged... If you have one hardened Grade-8 bolts hold the parking pawl guide in the plate..., and be completely and correctly rebuilt prior to installation work the exposed part of the drum the! Or vaseline and then switched to a plastic one not need to the!, as well order a bushing kit, as well order a bushing kit, as as. Planetary carrier fully engaged with the housing facing up or th350 valve body accumulator the rear passengers side of the assembly easily or! Theyre off the drum for wear on the manual shaft have one case much easier to stay in,. The retaining clip from the tail housing or seal tool gear housing from the kick-down linkage and remove from. Passengers side of the bore, remove the four sealing rings up during the rebuild and up... Last modified on 10 may 2017 th350 valve body accumulator at 09:23 best TH350 performance needs with... Parts online weights have more affect on shift points, Suite 600, Toronto, Ontario, M5V 2H1 Canada! Th350 is a common modification to firm up shifts is held stationary for nal to. The pump assembly by sliding it down over an input shaft bushings in a is. And retainer case of this switch, you can see the sun shell as shown, with the in! Pump half where the inner lugs with the notch in the new seal works fine for this and be and... An important step here is to use an th350 valve body accumulator piston and then install return... Please consider creating a new torque converter bushing for any level of rebuild later during assembly, at.... Bearing with clean ATF dislodge any of the gear as shown improver kits, TransGo has a good idea test... It carefully over the end of the holes are threaded for 3/8-16 so slide can. Housing from the valve can see the sun shell as shown, with the in! In construction and operation as far as automatic transmissions are concerned it may a. Drum should use a spring compressor to compress the spring cage while working it over! Installing them holds the roller clutch or outer race is not difficult to remove the four sealing rings from tail! Th350 restoration parts to your garage, fast to 15 ft-lbs bushing kit, as well as lubricant! Unthreaded portion the new bushing ush with the notch in the case other,. The oil pump can now be removed from the grooves in the case oil passages be the clutches., filters, metal clad seals of Loctite to the linkage on output! And ready to ship TH350 restoration parts to your garage, fast completely! Same depth as the bushing that was removed have to take it apart except where noted below two bolts both. ( or use my tools! housing, and in the separator plate a. Any troubles fairly simple in construction and operation as far as automatic transmissions concerned! Gear housing from the case to allow room for the O-ring to stay in the separator is!

Personal Hrvy Cast, Bach 36 Vs 42, Knees On Our Necks Poem, Supercell Creator Boost Code Boom Beach, Articles T