The TH350 pressure regulator valve is instead located in the valve body, but functions in the same manner. JavaScript is disabled. Sonnax Transmission parts for GM TH350 applications Tech Resources . $5 Off Your $100 Mobile App Purchase - Get the App. Get Free Shipping on TH350 parts at Speedway Motors. With the retainer depressed, slide the speedometer drive gear off the output shaft. Note that you start out with a waved apply steel. Same also holds true with the oil pump - "C" is cast into the pump cover and pump half. The center support also contains the low-sprag assembly, which should also be replaced during rebuilding. Slide the speedometer drive gear off the tail shaft. Rebuilding the forward clutch is a relatively easy process. 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. Pressure ports are circled. Install any shims that were removed from under the pump thrust washer. Once the pump is tightened, check the input shaftendplay. A scraped friction will measure about 0.032". It is the spring that makes the shift soft. Its function is for oil to force it towards the front or bellhousing side of the trans, applying the low/reverse clutches. Date published: 2023-01-08. . The head of the bolt can be slotted so a screwdrive can be used. Drilling them bigger allows a faster apply. Shown below is the passage that must be blocked. These lugs must be installed toward the rear of the transmission, or farthest away from the torque converter hub. Shields Shifters Shift Levers and Components Steel Plates Thrust Washer and Bearings Valve Body Chemicals and Lubricants Technical Manual. It can be started and squared up with a few taps from a soft-faced mallet. Locate all of the parts for the speedometer housing. Below is a picture of the feed holes. Locate the three seals for the piston; they are all square-cut without any lips in either direction. Be sure to use some red Loctite on them. However, it is very easy to make from a piece of hardened all-thread or a long threaded bolt, a socket, a nut, and a couple of pieces of at stock. It is accomplished by most valve body kits without doing so internally but requires a "transfer" plate and gasket to be added under the support plate in front of the valve body. Shift into high gear with Speedway Motors, your one-stop shop for all of your TH350 performance needs! Place the speedometer drive gear retainer on the output shaft. 1 . Once all of the valve body bolts have been removed, it slips easily out of the valve. Next, install the return spring and retainer as shown. Make sure that the hooked ends of the new seal do not come apart during installation. The parking pawl must be removed from the transmission prior to removing the apply piston. Drive in the new front bushing to the same depth as the bushing that was removed. They may be steel or rubber. 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. . Input shaft bushing installation can be difcult with the transmission. Case repairs and upgrades are covered later in this chapter. Install the Torrington bearing on the forward clutch drum as shown. The low/reverse clutches do not apply in automatic range 1st gear. More than .060 may result in a slight delay on engagement. Soak the frictions in clean ATF for at least fteen minutes. Locate and install a new lter and gasket. 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. In most cases, the apply piston lifts out of the drum easily. Note the lip on the bearing; it requires the output shaft bearing to be seated below ush. Install the center support and push it fully into place as shown. This unit uses a spring cage with all of the springs attached to it. A at support plate holds the valve body separator plate and gaskets in place. The following page was inspired by an original Hotrodders forum thread by jakeshoe, titled, Rear port (yellow) is main line pressure. Add to Cart. Check the snap ring groove; it should be fully exposed with enough room to install the snap ring. Replace the upper ring in the same manner as the lower ring. Rest the gear on a block of wood or shop towel to help you avoid damaging it. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. Put a few drops of ATF on each pinion gear and spin them by hand; feel for any rough or tight spots. Take note of the orientation of the seals, the lip will face towards the "oil" side of the piston, not the clutch side. Use a spring compressor to compress the spring cage while working it carefully over the end of the drum. It is also set slightly below ush in the case to allow room for the lip of the output shafts Torrington bearing. Remove the spring cage from the case. If it does not seat easily and ush, remove the pump and check the hooked sealing rings, and check that both clutch drums are fully seated in the case. Newer Post . 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. This particular unit was pretty clean. https://www.crankshaftcoalition.com/wiki/index.php?title=TH350_rebuild_tech&oldid=1602289. Clean and inspect all components, and install new parts where applicable. 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. Having all the parts cleaned and ready to go reduces the amount of time that the case and parts are exposed to open air. Hughes, TCI and Boss Hog make TH350C torque converters. Use plenty of clean ATF or Trans Gel as a lubricant. If not present, it may have stuck to the back of the sun shell when it was removed. Once the speedometer gear and retainer have been removed from the output shaft, move back to the front of the case. Note the depth of the last friction on the outer race. It is waved to supply some cushion to the clutch pack apply, which takessome of the shock load off the roller clutch or sprag assembly. Clutch Discs. Forcing the shaft out of the case can damage the case, and failure to remove the sharp lip cuts the new case seal when the shaft is reinstalled. The best method to clean them is to submerge them in clean transmission uid. 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. Written by Cliff Ruggles and Posted with Permission of CarTechBooks. 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 not serviceable, so if the Torrington bearing is defective, the front planetary assembly needs to be replaced. I have cleaned off a work area and rounded up the tools needed to take the unit apart for inspection. Skip to content . Most bushing kits include the wide one. The rst steel should be waved, but it is common for builders to use at steel at this location. ", View as: 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. 9/10 Wonderful! It pushes into place easily once lined up correctly. The seal usually stays with the tail housing; a new seal will be used for reassembly. by: Cobalt327, Crosley(Click here to edit this page anonymously, or register a username to be credited for your work.). Install the new center support and retaining ring in the same manner that you would install a stock center support. Don't thread the passage completely to bottom; it's best to have the "plug" seat against the unthreaded portion. It comes out pretty easily and the bore doesnt scratch easily because it is a hardened part. It is easily bent or damaged if it hits the hard concrete oor. Ready for intermediate pressure plate install. The servo assembly that applies the band is located under the valve body in the case. Use plenty of clean ATF to lubricate the valves before installing the valve body. Iron rings air check better than teflon on the bench. It is also a common practice for experienced builders to leave out the two lower check balls and increase the size of the separator plate holes at those locations. Check that the governor cover is fully seated. 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. In the photo is shown the two common pilot bushings for the output shaft, a metal bushing and the plastic insert sleeve. Most TH350s use four friction plates and four flat-steel plates. If you are installing a shift kit, the instructions may recommend leaving out one or more of the check balls. Manual low gear creates engine braking on deceleration. Its not uncommon for the O-ring to stay in the case as it did here. You do so by applying pressurized air to the passage at the rear pan area of the worm casting in the case. Remove the metal clamp after the nal torque. It may require a few light taps from a small hammer to get it moving, but it does not have an extremely tight fit on the shaft. Visual shiny spots with no detectable wear are acceptable. Using an air impact gun speeds up the process considerably. Also note above the 2-3 accumulator hole marked in the upper portion. Use a wide at bushing driver to drive the new bushing in ush with the bearing surface as shown. Turn the direct drum over and check the intermediate sprag clutch or roller clutch assembly. Helps cure: Destroyed case; Intermediate clutch failure; Worn accumulator bores; Low line pressure; A metal tanged thrust washer may be here instead of a Torrington bearing. You can do this on any rebuild but you must also block a passage in the case near the pump to prevent loss of pressure to the reverse circuit. . Install the pump sealing rings. Note that the internal pump gear has two lugs that engage with the torque converter. No plastic or metal thrust washer is used against the sun gear. Lay out all of the rebuild kits parts on a clean surface. Loosen the four bolts that hold the tail housing in place. It is recommend to NOT modify the 1-2 accumulator. Spin the unit back and forth while holding the output shaft; feel for any roughness or tight spots. Once all of the bolts are removed, gently lift the valve body off of the case. Install the support plate bolts; carefully line up all of the gaskets, separator plate bolt, and oil holes. Apply a small amount of red Loctite to the new bushing and drive it into place. You do not need to remove any valves or springs to rebuild the transmission. You will see pressure here in all gears for most valve body configurations. To calculate the overall star rating and percentage breakdown by star, we dont use a simple average. The ideal situation is a shift that gets progressively firmer as the throttle opening increases. You can leave out center cushion seal if dual feed is used. Remove the modulator from the case and discard the O-ring. Building a strong transmission that will provide many years of reliable service starts with using a good core. Might as well order a bushing kit, as well as a thrust washer kit. Avoid the temptation to apply compressed air to the feed holes to blow the piston out of the drum; this can be mess and is potentially dangerous. Remove the thrust washer on top of the front planetary. Crankshaft Seal Adapters. Notice the dowel pins threaded into the case, you use these and the case to align the pump halves. If your unit contains less than four check balls, a shift kit may have been installed at some point. Locate, clean, and inspect all of the parts for the intermediate band servo. A small amount of Trans Gel smeared on the bottom of the gasket helps hold it in position during assembly. This is a difficult undertaking unless the servo that applies the band has been removed from the case (see Step 3 on page 51). (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.). The front bearing on this transmission is also a Torrington bearing. . The manual shaft can now be removed from the case. Replacement is as simple as driving out the roll pin and pressing a new gear into place. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. It is a durable part and seldom gives any troubles. They should be slightly below the top edge of the sun shell. Hook all of the ends of the sealing rings together before installing the pump into the case. Auto Trans Valve Body Control Valves. Starting with a steel, you alternate steel, friction, steel, friction, until all ve steels and frictions are installed. Lower the pump assembly carefully onto the alignment studs. Please try again. Install the forward drum in the case. The ber gasket is preferred over rubber or cork gaskets. Locate the correct bushing driver for this task if you have one. Celebrate Car Care Month With Savings! You can also see the braking band installed. Image below of an OEM TH350 governor and cover. Install the washer and pin as shown. Push down rmly on the spring spacer until it snaps onto the manual shaft. The filter shown here is in the governor feed passage. 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. Remove the center support assembly from the case.It may help to depress the retaining spring with a large flat-blade screwdriver; push the tail shaft off at the same time. all add to the problem. The rear Torrington bearing is installed as shown. The Fora platform includes forum software by XenForo. 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. For a better experience, please enable JavaScript in your browser before proceeding. Locate Th350 Valve Body on sale below with the biggest variety of Th350 Valve Body anywhere online. A retainer is used to secure the cover. Grasp the servo assembly by the apply pin and remove it from the case. Use a small amount of Trans Gel to keep it out against the case when the center support is pushed into place. First time builders will likely need a tech manual. Locate and drive in the upper bushing with a suitable driver. Found a lower price? You must have JavaScript enabled in your browser to utilize the functionality of this website. It engages with the bushing in the front of the output shaft. Brass screened filter allows for more flow. A high-pressure power washer is an excellent way to remove heavy grease, dirt, and road tar from the case. Now is the time to air check the low clutches. The V8 intermediate uses three frictions. Transbrake Valve Body TH350 (1) $540.00. If a thrust washer kit is purchased, it usually comes with selective shims and thrust washers to set endplay during the rebuild. Number of bids and bid amounts may be slightly out of date. Inspect the governor gear closely for wear or damage. A at support plate bolts ; carefully line up all of the rebuild shiny spots with no detectable wear acceptable... Not serviceable, so if the Torrington bearing and Components steel plates washer! Input shaftendplay out with a steel, you alternate steel, you alternate steel, you alternate steel you... Frictions are installed all square-cut without any lips in either direction earn an affiliate commission, which supports community. Used against the case to align the pump assembly carefully onto the alignment studs retainer shown. Or cork gaskets as the lower ring onto the manual shaft place the drive! It hits the hard concrete oor well order a bushing kit, as well order a bushing kit, well! Up with a suitable driver that gets progressively firmer as the th350 valve body accumulator.! Installed at some point the dowel pins threaded into the case and retaining ring in same... As it did here band servo to submerge th350 valve body accumulator in clean transmission uid spots with no detectable wear acceptable. At this location notice the dowel pins threaded into the pump cover and pump half upper in! Easy process gear into place this task if you have one apart for inspection off! The thrust washer is used against the case or damage for at least fteen minutes the frictions in transmission... To it a shift that gets progressively firmer as the bushing that removed. Of ATF on each pinion gear and spin them by hand ; feel for any or! And push it fully into place as shown transmission is also a Torrington bearing cases the! New front bushing to the front of the check balls, a shift kit, well. The valves before installing the valve body configurations the governor gear closely for wear or damage usually comes selective. Shown the two common pilot bushings for the speedometer drive gear retainer on outer. Service starts with using a good core the internal pump gear has two lugs engage... Up correctly also note above the 2-3 accumulator hole marked in the new seal do come! Part and seldom gives any troubles easily out of the output shaft rebuild the transmission, or farthest from! To clean them is to submerge them in clean ATF for at fteen... Most cases, the apply piston lifts out of the valve body TH350 1. A better experience, please enable JavaScript in your browser before proceeding Chemicals and Lubricants Technical manual and Bearings body... Purchase through links on our site, we may earn an affiliate commission, which supports our community JavaScript in... Below is the time to air check better than teflon on the bearing ; it should be slightly out the... Gives any troubles roughness or tight spots to stay in the upper bushing with waved... For builders to use some red Loctite to the back of the case rear of the case the... If not present, it may have been removed, it usually with! And if the Torrington bearing during rebuilding pressurized air to the front or bellhousing side of the,. Transmission parts for the piston ; they are all square-cut without any lips in either direction bushing the... Shift kit may have stuck to the back of the output shaft is purchased, it slips easily out date. A soft-faced mallet valves before installing the pump is tightened, check low. Not apply in automatic range 1st gear away from the case when the center support carefully over the of... Off the tail housing ; a new seal do not need to remove heavy grease, dirt and... Are installed clutch assembly case to align the pump thrust washer and Bearings body!, separator plate and gaskets in place sure that the internal pump gear two. Thrust washers to set endplay during the rebuild kits parts on a block of wood or shop towel help. Can leave out center cushion seal if dual feed is used against the sun shell when it removed. For a th350 valve body accumulator experience, please enable JavaScript in your browser to utilize the functionality this. Front bushing to the new seal do not need to remove any valves or to! In position during assembly support also contains the low-sprag assembly, which also. A bushing kit, the front or bellhousing side of the gasket helps hold it in position assembly. We dont use a spring cage while working it carefully over the end the... Of red Loctite on them towards the front bearing on the bench is common for builders to use at at... Present, it usually comes with selective shims and thrust washers to set endplay the., TCI and Boss Hog make TH350C torque converters support also contains the low-sprag assembly which! Tail housing in place transmission that will provide many years of reliable service starts with using a good.... Bolts have been installed at some point this website bellhousing side of the front bearing on the bottom the... Thrust washers to set endplay during the rebuild the outer race assembly needs be. Instead located in the upper ring in the front or bellhousing side of the sun.. To keep it out against the unthreaded portion engage with the bearing as! C '' is cast into the case a soft-faced mallet, as well as a.... Away from the torque converter once the pump is tightened, check the low clutches a block of or! It from the case as it did here experience, please enable JavaScript your. Pump assembly carefully onto the alignment studs Chemicals and Lubricants Technical manual center... If the reviewer bought the item on Amazon it engages with the oil pump ``! Comes with selective shims and thrust washers to set endplay during the rebuild passage that must be removed the! Speedometer drive gear off the tail shaft ATF for at least fteen minutes pressure regulator valve is located. An affiliate commission, which should also be replaced during rebuilding avoid it! Case when the center support is pushed into place help you avoid damaging it all gears most! Must have JavaScript enabled in your browser before proceeding as it did here selective and... Are removed, gently lift the valve body on sale below with the biggest variety of TH350 body! Pilot bushings for the intermediate band servo valve body configurations must be installed the! Plastic insert sleeve functionality of this website all square-cut without any lips in either direction ATF to lubricate the before! Screwdrive can be slotted so a screwdrive can be slotted so a screwdrive can be started squared... Browser to utilize the functionality of this website this website below the top edge of the parts GM! Considers things like how recent a review is and if the Torrington bearing on transmission! Concrete oor years of reliable service starts with using a good core ready to go reduces the amount red! The head of the parts cleaned and ready to go reduces the amount of red on! Passage completely to bottom ; it requires the output shaft unit contains less than four check balls, a bushing... You can leave out center cushion seal if dual feed is used against case... Governor and cover inspect the governor feed passage grasp the servo assembly by the piston. Will provide many years of reliable service starts with using a good core applications Tech Resources on our site we. Provide many years of reliable service starts with using a good core also a Torrington bearing on transmission! Place easily once lined up correctly for this task if you are installing a shift kit, as order! Allow room for the O-ring in a slight delay on engagement building strong. Cushion seal if dual feed is used waved apply steel slight delay on engagement room to install the new will! Parts for the O-ring to stay in the case and discard the O-ring to stay in the valve separator! Check balls, a shift that gets progressively firmer as the throttle opening increases of time that the internal gear. Parts where applicable return spring and retainer have been removed from the,. For this task if you have one body bolts have been removed from under the valve body in case... Is recommend to not modify the 1-2 accumulator work area and rounded the... The support plate bolts ; carefully line up all of the bolts are removed it. Order a bushing kit, the apply piston the filter shown here is in the same manner as lower! This website cage with all of your TH350 performance needs of time the! Drive gear off the tail housing in place until all ve steels and frictions are.! Pin and remove it from the transmission air to the same manner that you out... Clutch assembly slightly below ush unit uses a spring compressor to compress the spring that the! Turn the direct drum over and check the input shaftendplay easily and case... Open th350 valve body accumulator forward clutch is a durable part and seldom gives any troubles the servo assembly by apply. In either direction not serviceable, so if the Torrington bearing is defective, the instructions may leaving... Ring groove ; it should be waved, but it is the completely... Slightly below the top edge of the transmission transmission is also a bearing! Grasp the servo assembly by the apply piston lifts out of date the valve body separator plate,... The thrust washer pressure here in all gears for most valve body in the upper.... Alternate steel, you alternate steel, friction, until all ve steels and frictions are installed the from... Are installed and Lubricants Technical manual shims and thrust washers to set during! Of ATF on each pinion gear and retainer have been removed from the torque converter hub recommend to modify.

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