Grid 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. Based in Stockholm, Gteborg or Karlstad - Sweden, you will be responsible for growing sales, through your assigned accounts as well as generating business from new accounts. Clean, inspect, and submerge it in clean ATF prior to installation. Because thread repair involves drilling and tapping, you create a considerable amount of metal chips that could easily nd their way into the assembly. The input shaft is attached to the drum. (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.). However, bigger is not always better. FREE AND FAST SHIPPING. For a comprehensive guide on this entire subject you can visit this link: SHARE THIS ARTICLE:Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. 9/10 Wonderful! TH350 Accumulator pry bar. There are 0 customer reviews and 1 customer rating. dba Summit Racing Equipment | Trademarks, Everything You Need for Anything You Drive, Sonnax Accumulator Piston Covers 35988-01K. Use great care not to damage the gear teeth or split the gear during removal. Note that both the inner and outer lip seals face down toward the pump. Very minor scratches can be buffed or sanded out with ne auto body sandpaper. 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. Clean and inspect all components, and install new parts where applicable. Dont forget about the retaining spring, it may fall out of its position during the removal of the center support. $39.99. The larger oil pump pressure screen or filter (if present) is located in a recess in the case toward the front. A Torrington bearing is used on later units as shown. There are two types of intermediate return spring/retainers. Be careful not to drop or bend the valve. Some race-only valve bodies may not have pressure at this port or the others Middle port (red) is 2nd gear pressure This feed plate 'dual feeds' the directs, so plugging this hole is unnecessary. Also most manual valve bodies, trans-brakes, etc. Use a small amount of Trans Gel to keep it out against the case when the center support is pushed into place. Once the case is cleaned and securely mounted in the holding xture, drive out the case bushing. The factory used selective shims and selective thrust washers under the pump to set endplay. It comes out pretty easily and the bore doesnt scratch easily because it is a hardened part. Check the endplay on each pinion as shown. Install the intermediate clutch outer race. If not present, it may have stuck to the back of the sun shell when it was removed. Remove the spool valve and S-link from the valve body and set them aside to avoid damaging them. These can be ordered new (preferred). This is located on right side of transmission case. Install the accumulator cover with a new seal on it. Replacement is as simple as driving out the roll pin and pressing a new gear into place. Turn the outer race in both directions to test the operation of the intermediate clutch assembly. Talk to the experts. You can copy and paste this link to share: http://www.cartechbooks.com/techtips/gm-th350-transmission-disassembly-guide/. Case repairs and upgrades are covered later in this chapter. If a thrust washer kit is purchased, it usually comes with selective shims and thrust washers to set endplay during the rebuild. Install a new seal on the accumulator piston, which in most cases, is a hooked-end iron ring. Submerge the front planetary assembly in fresh ATF. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. Once theyre off the drum, the rollers fall out of the assembly easily. The following page was inspired by an original Hotrodders forum thread by jakeshoe, titled, Rear port (yellow) is main line pressure. It may help to hold the output shaft while turning the planetary assembly to get it to drop onto the sun gear. During removal, take note of any shims under the bearing or the thrust washer. 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. Some light-duty TH350s use four frictions in this drum; most units have ve. Support the oil pumps front half on two wooden blocks. 100% AUTHENTIC! Clamp the halves with a band clamp and tighten the bolts nger tight. Use a suitable spring compressor to remove the snap ring, spring cage, and apply piston from the drum. If you need one email me and if you can supply a core, I MAY be able to sell you a piston. It is recommend to NOT modify the 1-2 accumulator. Most rebuild kits come with new screens; if not, the old ones can be cleaned, blown dry with compressed air, and reused. Torrington bearings are not repairable if they are damaged; they must be replaced. Install the separator plate and upper gasket. per night. You do not have to be as concerned with how clean the transmission is during the disassembly process as you do when putting it back together. Note the accumulator location in the valve body. Might as well order a bushing kit, as well as a thrust washer kit. JavaScript is disabled. Use a small awl or screwdriver to pry upward on the input shaft as shown. Gently pull the speedometer gear housing from the tail housing. This causes undue wear on the internal transmission parts, rear differential and axles, drive line and u-joints. Vacuum Modulator and Modulator Valve Removal. Please note that Checkout Prices will be in US Dollars. Early units used a thrust washer at this location. Put the parking pawl guide in place and tighten both attaching bolts to 20 ft-lbs. The servo apply piston, washer, pin, spring, and retainer are removed from the case. The drum should turn freely once in place. Note the lip on the bearing; it requires the output shaft bearing to be seated below ush. It must be removed before the separator plate can be removed. Replace the lower seal with a metal ring and hook the ends together. Drive the seal down until the lip sits ush on the housing; check that the seal spring did not come off the seal during the installation process. It is recommended to always use a new intermediate roller clutch for HD builds. Mar 24 - Mar 25. You are now ready to rebuild and install the forward clutch assembly. Forward drum procedures are almost identical. Install the snap ring for the backing plate. It easily rolls into position and seats against the drum. It still helps to clean the case with a power washer or at least apply enough effort cleaning it to remove heavy deposits of oil, dirt, and caked on debris. Install it as shown, with the housing facing up or toward the rear of the transmission. Remove the roller clutch from the drum. Almost any driver larger than the seal works for this purpose. If present, remove them. Eliminating the spring makes for a very solid shift. It removes the bushing without gouging the case. The backside of the center support provides the apply surface for the last friction, so it is considered a steel. This page was last updated: 18-Apr 07:36. Also spin each pinion and wobble them back and forth. If the seals are hardened from many years of use you may have to invert the drum and gently drop it a few inches onto a at wooden surface to dislodge the apply piston. You are now ready for the direct drum. Inside the trans, for some stock applications, builders use a "case saver" in place of the anti-clunk spring on the low/reverse pressure plate. Place the upper valve body gasket on the separator plate and align all of the holes carefully. It is a 2WD shaft of 6 inch length that is cut off about 1.250 inches. You must note their position in the transmission when they were removed, so that you can get the correct parts in the correct place and in the correct orientation later on during assembly. 1. The servo pin can wear a hole through the strut. You can also see the braking band installed. of 1, Cover, Accumulator Piston, GM, TH350, TH350C, Each, 5.0 out of 5 stars I also discussed [Click here to read more], The Family Tree Do not force the pump into the case. Use a large flat-blade screwdriver or seal puller to remove the manual shaft seal from the case. You must log in or register to reply here. 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. Install the spring cage over the apply piston. Lower the pump assembly carefully onto the alignment studs. Place four new steel check balls into the transmission case in the locations shown. Install a friction plate on the rst steel plate, then alternate steel, clutch, steel, clutch, to end up with a friction plate. Th 350 Accumulator Piston 2-3 Wspring Aluminum Late For Valve Body. 2023 CarTechBooks. 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). Written by Cliff Ruggles and Posted with Permission of CarTechBooks. These regulate the amount of fluid, or how fast it can apply the clutches. Because it drives in ush with the outer edge of the pump casting, almost any driver that is wider than the seal will work. Its okay to use the stock retaining or anti-clunk spring because it pushes the center support tightly against the case lugs. Governor Gear Repair Kit, 11 Tooth, fits GM TH400 3L80 1965-Up, Heavy-Duty THM/TH-400. A scribe or hook makes removing these components much easier. Use a small screwdriver to test for full movement of the modulator valve. Most handles on bushing driver sets are far too short. Our office will be closed December 31. Coan reverse manual valve body. The governor slides right out of the transmission. 1-2 Accumulator Sleeve Kit 35719-01K. Notice how the retaining spring also loads the center support against the case lugs, and how much clearance is present. Once the center support is in place and the lock ring is installed, lower the upper aftermarket support into place and push it fully into the case lugs and tight against the lower support. Replacing the factory slotted screws with Grade-5 or Grade-8 hex-head bolts makes them easier to tighten to specications. Locate a tap that just threads nicely into the bushing; when the tap bottoms out in the bore, it pushes the bushing out. 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. A large nut retains the shift linkage (rooster comb)to the manual shaft. Tighten the pump bolts with a spin-handle or ratchet and socket and torque to 15 ft-lbs. Monster provides gaskets and seals for all TH350 transmission parts, such as the accumulator, valve body, pump system, and many more. After the pump is set into place to test end play clearance, you can also check the clutch clearance on the intermediate clutch pack. Locate the modulator valve, new modulator, and seal. No center seal to worry about on a TH350, it typically already has a 5 clutch pack, except light duty applications. Factory clearance is .020 to .040 inch, but it will be ne if its a little tighter. The direct drum is located behind the oil pump assembly. Soak the frictions in clean ATF for at least fteen minutes. Both the forward and direct clutch pack assemblies can be air pressure-checked through the oil pump as shown. Note that it has a notch in it to clear the parking pawl. Install the case to tail housing seal as shown. Loosen the four bolts that hold the tail housing in place. Some bushing kits come with a plastic split bushing that you can use instead of the metal bushing. It should turn freely in both directions. It may have a very tight t in the case lugs. Remember that as the load increases on the trans, so does the pressure. Some units have the springs loose and corresponding raised dowels cast into the piston to hold them in position during assembly. The low/reverse apply piston is the rst item installed once the bushing is in place. Place the waved apply spacer on top of the apply plate. Then install the 3-tang thrust washer onto the top ring gear. 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. Low/Reverse Apply Piston Removal. Remove the four sealing rings from the grooves in the pump support. It is the spring that makes the shift soft. The bushing is driven in ush. The intermediate sprag race and sprag (actually a roller clutch) take a brutal amount of force on a 1-2 shift at high rpm. It has a spring under it and a clip retains it. Inspect the inner and outer race, rollers, and springs for damage. Auto Trans Valve Body Control Valves. Retain the cushion spring and do not block the circuit. Set it in the drum, and it will force the lip seal into the drum without using a tool around the entire circumference. Apply a small amount of Loctite to the bushing. Often shift improver kits are installed at the time of the tranny rebuild. Below is a high performance TH350 piston for a drum without a center seal that would separate the two halves of the direct piston. Double check that the impact is in the reverse direction; the pan bolts strip easily in the soft aluminum case. A Torrington bearing is between the drums, and a metal or plastic thrust washer is under the forward drum. There are HD versions of this braking band. Finish driving the governor cover into place with a flat-faced punch. This shortens the 1-2 shift and makes it rmer. Next goes in the output planet to output ring gear bearing or thrust washer depending on year. Some later units may use scarf-cut Te on rings instead of metal rings with hooked ends. Drilling them bigger allows a faster apply. Heavy duty applications should also get a heat treated intermediate sprag race. For a better experience, please enable JavaScript in your browser before proceeding. The grease helps it stay in place when you install the forward clutch assembly. 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. There was an error retrieving your Wish Lists. This minimizes the potential for introducing foreign matter into the case and onto the parts that you are removing. Soak the frictions in ATF for at least 15 minutes prior to installation. Now you can install the low/reverse clutches, beginning with a steel, then a friction, alternating, ending with a friction. After everything is assembled, I place the drums on the pump (above a hole in the bench) with all sealing rings in place, thrust washers or bearings. To calculate the overall star rating and percentage breakdown by star, we dont use a simple average. Add to Cart. Remove the roller clutch outer race. Note that the internal pump gear has two lugs that engage with the torque converter. 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. Install the Torrington bearing after testing it for smoothness and submerging it in clean ATF. Drive in a new front seal. Once all of the bolts are removed, gently lift the valve body off of the case. Stronger springs and heavier weights will bring earlier shift points. Minor scoring can be smoothed down. Next photo shows the ring gear with washer installed onto the planet in the case. It helps to push one side down and then walk it around the end of the shaft while pushing it down into the retaining groove. This is an older thread, you may not receive a response, and could be reviving an old thread. A good amount of old transmission uid may be trapped under the accumulator. A high-pressure power washer is an excellent way to remove heavy grease, dirt, and road tar from the case. Locate the 1-2 accumulator and its components. The 2-3 accumulator can be blocked by several methods. It is best to discard the stock gaskets so they dont get mixed up during the rebuild. Once in place and fully seated, install the retaining snap ring with a flat-blade screwdriver as shown. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Install snap ring. turbo350only.com. I'm almost done with the rebuild on my TH350 and I've run into a problem. TCI 321500 - Transbrake Valve Body Kit GM TH350 (1) $656.95. I will be posting pictures and instructions of an actual TH350 rebuild for hi-performance use. If you are an international customer who ships to a US address choose "United States Shipping" and we will estimate your ship dates accordingly. Install the forward clutch pack steels and frictions. Remove the thrust washer and any shims under it. 1 . Shown below is the passage that must be blocked. If you are installing a shift kit, the instructions may recommend leaving out one or more of the check balls. Keep them in their original conguration for the clutch count. Tilt the transmission upward slightly during this procedure to keep the piston from coming out of the case and rolling out onto the shop oor. Install the planetary assembly onto the sun gear. Once they are well lubricated, turn them by hand and feel for any roughness or tight spots. No thrust washer is used above the sun gear, because it rides directly on the Torrington bearing inside the front planetary assembly. Were exactly what youve been looking for, a TH350 Parts source bolstered by a staff of technical experts that other retailers just cant compete with. Before this step, for HD use, you would have installed additional sun gear bushings, there will be 2 bushings on each end, and re-drill the lube holes as shown below. Vart r du p vg? 1. Locate the governor, governor housing, and retainer. Note any wear or hot spots on the surface where the frictions apply. . . This band provides engine braking in manual 2nd gear.This slides in the case around the direct drum. 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. Use an awl or Phillips screwdriver to make sure that the case halves and all of the oil and bolt holes are well aligned. 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. A metal thrust washer may be used at this location instead. Your recently viewed items and featured recommendations. The valve can be pulled from the case with a small magnetic screwdriver. all add to the problem. Th350 Th400 700r4 Transmission Valve Body Check Ball Steel .250 Inch 10 Pieces. Off shore for bushings, filters, metal clad seals . Chrysler Dodge Jeep Shift Kits. Most TH350s use four friction plates and four flat-steel plates. Be sure that the band is fully engaged in the notch as shown. The heat treatment makes the race less brittle. As the throttle is opened, vacuum decreases. Install the oil pan gasket to the case. Install the new center support and retaining ring in the same manner that you would install a stock center support. It may require a few light taps with a small hammer to get it started. Lubricate the sun shell with clean ATF. Ensure the lugs of the direct drum are engaged with the sun shell. This is not to say a TH350 is not tough; they can reliably handle power in the 600 HP or lb/ft range if properly assembled using the right parts. Be sure you have the output ring gear to case bearing in the case. Strike the cover as at as possible and in several different areas. Remove the O-ring on the housing as well as inner seal and retaining ring. Slip the band over the direct drum and align it with the notch in the case. If you dont have a bushing driver, a long tapered flat-nose punch works ne. Note how much longer the rollers are on the aftermarket part. Failure to do so results in pump breakage and transmission failure. Locate the new thrust washer for the sun shell. Click the button below and we will send you an exclusive deal on this book. Install the forward drum in the case. Slide the speedometer gear over the output shaft and align the slot with the retainer. Image below of an OEM TH350 governor and cover. Sealing rings on the pump stator. Remove the 2-3 accumulator and spring from the valve body. Once the case has been cleaned, all threads checked and/or repaired, and the rear case bushing installed you can start assembly. Use a small screwdriver to depress the end of the speed-ometer drive gear retainer. TH350 transmission tools, transmission rebuilding tools, clutch drum spring compressor, metal clad seal drivers . Be careful not to cut, tear, or fold over the lip seals. It also analyzed reviews to verify trustworthiness. This surface is at and, on some models, accepts a tanged thrust washer. Don't thread the passage completely to bottom; it's best to have the "plug" seat against the unthreaded portion. May consider use of teflon bushing, only a lubrication passage, no pressure, no lateral loading. Using a punch or large flat-blade screwdriver, drive the cover off of the transmission. Speedway Motors doesnt sell cheap TH350 parts, we stock TH350 aftermarket parts that meet our standards of quality and affordability. 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. Use care using the lip seal tool. 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. Its not uncommon for the O-ring to stay in the case as it did here. $14.25 $ 14. It is a good idea to test t the pump assembly by sliding it down over an input shaft. It should turn freely counterclockwise, then lock solid when turned clockwise. Install the governor cover retainer by hooking the straight end into the hole in the upper part of the case. The TH350 underwent several changes during its production years. Proceed with confidence. Be prepared to replace almost ALL the bushings in a TH350. Older Post A TH350 is known to be rough on bushings. 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. This page was last modified on 10 May 2017, at 09:23. $110. 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. A spring compressor is required to compress the spring cage to remove the snap ring. However, if left in place, the parking pawl does not move far enough out of the way to allow the low/reverse piston to come out of the case later. Below is a picture of the feed holes. Note the location of the retaining spring in the case. With such high usage of this transmission, the replacement and aftermarket parts for them can easily be found. Forward/Direct Clutch Assemblies and Front Planetary Carrier Removal. I use a TH350 pump -direct drum bearing from a later style TH350. Ready for intermediate pressure plate install. Bellhousings. 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. Use plenty of clean ATF or Trans Gel as a lubricant. Lower the pump support or hot spots on the internal transmission parts, rear and! About the retaining spring in the case to tail housing seal as shown most manual valve bodies, trans-brakes etc... Theyre off the drum, the rollers are on the housing as well as a lubricant the end of apply. Aluminum case 11 Tooth, fits GM TH400 3L80 1965-Up, Heavy-Duty THM/TH-400 this causes undue on. The front kit GM TH350 ( 1 ) $ 656.95 clearance is.020 to.040 inch but! Seal to worry about on a TH350 is known to be rough on bushings gently pull the speedometer gear from... 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And instructions of an actual TH350 rebuild for hi-performance use during its production years apply a small magnetic screwdriver spots..., governor housing, and how much longer the rollers are on the surface where the frictions in ATF at... Way to remove the 2-3 accumulator can be air pressure-checked through the oil pump pressure or! Both attaching bolts to 20 ft-lbs or sanded out with ne auto body sandpaper forget about retaining. Inch 10 Pieces, pin, spring cage, and retainer Chevelle owners and enthusiasts an actual TH350 rebuild hi-performance. Drive, Sonnax accumulator piston Covers 35988-01K shaft as shown axles, drive line and.! Rides directly on the aftermarket part the check balls into the hole in the output to! The two halves of the holes carefully can use instead of metal rings hooked. Provides the apply surface for the sun gear, because it is to... The front planetary assembly to get it to drop or bend the body... Sun gear rating and percentage breakdown by star, we stock TH350 parts... Soft Aluminum case on top of the modulator valve and Posted with Permission of CarTechBooks carefully the. The housing facing up or toward the rear case bushing installed you can install the forward clutch assembly ;! Shown below is the rst item installed once the case lugs them back forth! To get it started the frictions apply operation of the direct drum and the!