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. Make sure that it is fully seated against the last friction. Locate Th350 Valve Body on sale below with the biggest variety of Th350 Valve Body anywhere online. Remove the pump retaining bolts, which have 5/16-18 threads. Install the backing plate over the last friction. 25. 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. Hipster only offers this in a reverse pattern valve body, we offer many valve bodies in a forward pattern. 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. The factory used selective shims and selective thrust washers under the pump to set endplay. iron valve body; weight- 120 pounds length- 21 3/4" 4 output shaft extension . 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. Install the manual shaft through the case and case seal. The accumulator will be removed later. There was an error retrieving your Wish Lists. 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 Start with a at steel plate. Drive in the new front bushing to the same depth as the bushing that was removed. 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. Slide the planetary assembly off the output shaft.Occasionally, the planetary assembly does not want to slide off the front of the output shaft. It pushes into place easily once lined up correctly. The tail housing comes off easily, with (at most) a tap with a soft-faced mallet to loosen it from the case. Set it in the drum, and it will force the lip seal into the drum without using a tool around the entire circumference. Use an air impact to remove the 5/16-18 valve body bolts. Copyright 1995-2023 eBay Inc. All Rights Reserved. Then push it into the rear of the case evenly by hand, aligning it properly so it will seat (there is a "tang"). Put a few drops of ATF on each pinion gear and spin them by hand; feel for any rough or tight spots. There are HD versions of this braking band. You do not have to take it apart except where noted below. Use a sharp pump to catch the edge of the torque converter bushing and drive it out of the housing. (2,616 reviews) Most of them are replaced during the rebuild, so you need the old parts in the correct location so you can compare them with the new parts that you are installing. Its function is for oil to force it towards the front or bellhousing side of the trans, applying the low/reverse clutches. 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. Remove these two bolts and remove the parking pawl guide from the case. Install new seals on the apply piston, lips facing down, and install the apply piston in the drum. The servo assembly that applies the band is located under the valve body in the case. The used TH350 transmission is secured in the holding fixture and is mounted on the workbench. Use a suitable driver to install the manual shaft seal into the case. Install the inner race for the low-roller clutch. Having long-handle custom-made pliers angled slightly at the tips makes this snap ring removal much easier. $5 Off Your $100 Mobile App Purchase - Get the App. De-burr the edges of the manual shaft so it does not cut the seal as it passes through. The design of the OE planet determines bearing or thrust washer use. Retain the cushion spring and do not block the circuit. Soak the frictions in clean ATF for at least fteen minutes. Install a new hooked sealing ring on the intermediate band servo piston in the same manner as for the 1-2 accumulator. Install the new bushing to the depth as shown in the pictures. Forward clutch pack clearances can be tighter than usual; however it must have some clearance. Remove the large snap ring as well as the frictions and steels. There is a lot of load on this bushing, and it should ALWAYS be replaced on overhaul. The case bushing is driven in from the front. Stay Updated with Emails from Summit Racing. This page has been accessed 508,361 times. Remove the modulator valve from the case. 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). This requires that the spring compressor must have the ability to accommodate the input shaft and still compress the spring cage. Pump gear install. Automatic transmissions rely on hydraulic uid and pressure to work correctly, so there are multiple passages and moving parts, including valves, that need to move freely for correct function. It really helps if you can nd the parting line in the bushing and strike it there. Be prepared to replace almost ALL the bushings in a TH350. Right side of TH350 case. Check that the governor cover is fully seated. Apply a small amount of red Loctite to the new bushing and drive it into place. Turn the outer race in both directions to test the operation of the intermediate clutch assembly. My rebuild included a TransGo shift kit that uses one additional gasket under the stock support plate as shown. It is not serviceable, so if the Torrington bearing is defective, the front planetary assembly needs to be replaced. General Motors Turbo-Hydramatic 350. . All transbrake applications will require dual feed of the direct clutch, possibly as well as manual valve bodies. Install the intermediate band as shown, with the pin end down and to the left. 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. [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. It is a relatively rugged, compact transmission that lends itself to a wide variety of applications and modifications. The low/reverse clutches do not apply in automatic range 1st gear. They are offset. 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. From our companys beginnings in 1952, to the haven for racers & rodders weve become today, our family-run business has never strayed from our promise of providing hassle free ordering & delivery, affordable prices, a specialized selection of quality parts, and the best TH350 parts catalog around. It may require a few light taps with a small hammer to get it started. If you need one email me and if you can supply a core, I MAY be able to sell you a piston. Once the center support is pushed into place on the case lugs, install the retaining ring as shown. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. Most rebuild kits come with the hook-end metal sealing rings shown. Although we can't match every price reported, we'll use your feedback to ensure that our prices remain competitive. This may involve some extra effort to remove paint or old undercoating that may be covering up troubled areas. Stronger springs and heavier weights will bring earlier shift points. Note the orientation of the tangs on the inner gear. Use the factory shims for the rst trial assembly. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. If your unit contains less than four check balls, a shift kit may have been installed at some point. 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. Something went wrong. The TH350 valve body is cast iron and has steel valves. This wiki is not intended to be a replacement for an ATSG or factory tech manual. The wider bushing is recommended for all levels of rebuilding because it provides additional support for the direct drum, improves sealing at the rings, and prolongs service life. Install the spring, piston, and retaining clip carefully. Bellhousings. Make sure that the retainer snaps over the end of the gear as shown. Tighten the four bolts that hold the housing to the case; torque to 35 ft-lbs. 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. Install coasting band aka braking band. Once the support plate is removed, the gaskets and separator plate lift off of the case. Be careful not to cut, tear, or fold over the lip seals. Install the input planet next, pictured below with torrington bearing installed. 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. Install the snap ring for the backing plate. Then install the 3-tang thrust washer onto the top ring gear. There are 0 customer reviews and 1 customer rating. TH350 gaskets are mechanical seals that fill the spacing between different mating surfaces. 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. Repeat this procedure for both lower bushings. 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. We love getting under the hood just like you do, because our employees are racers and rodders too. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Before bolting the pump halves together, measure them with a feeler gauge to make sure that the pump gears have some clearance. Notice the dowel pins threaded into the case, you use these and the case to align the pump halves. If not removed, it can be very difficult, if not almost impossible to pull through the case. Remove the O-ring on the housing as well as inner seal and retaining ring. Reply Quote. Be sure you have the output ring gear to case bearing in the case. Unhook the ends on all four sealing rings. Do not force the pump into the case. Drive in a new front bushing. Use a sharp punch or the correct bushing driver to remove the tail shaft bushing and seal. Excessive pinion to ring gear backlash, worn u-joints, etc. Some units have the springs loose and corresponding raised dowels cast into the piston to hold them in position during assembly. Hughes, TCI and Boss Hog make TH350C torque converters. Add to Cart. Featuring a huge selection of TH350 parts - in stock and ready to ship today! Let us know. Place four new steel check balls into the transmission case in the locations shown. Submerge the front planetary assembly in fresh ATF. Grind the tip of the punch at a slight angle; it helps catch the edge of any bushings that you need to remove. 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. Notice the scraped and split low reverse friction in the intermediate piston cavity. Low/Reverse Apply Piston Removal. It is best to clean all of the parts before you start the assembly process and give them a very close inspection for cracks, wear, broken or chipped teeth, etc. TH350 transmission tools, transmission rebuilding tools, clutch drum spring compressor, metal clad seal drivers . A suitable driver that is slightly smaller than the bore is required because the bushing must be below ush. of 1, Cover, Accumulator Piston, GM, TH350, TH350C, Each, 5.0 out of 5 stars Install the support plate bolts; carefully line up all of the gaskets, separator plate bolt, and oil holes. During removal, take note of any shims under the bearing or the thrust washer. I have cleaned off a work area and rounded up the tools needed to take the unit apart for inspection. A high-pressure power washer is an excellent way to remove heavy grease, dirt, and road tar from the case. Factory clearance is .020 to .040 inch, but it will be ne if its a little tighter. The stock TH350 center support is shown stacked on top of an aftermarket bolt-in center support. It is held in place by a single 5/16-inch bolt and retaining clamp. Assembled direct drum sprag and race with retainer. Use a suitable spring compressor to remove the snap ring, spring cage, and apply piston from the drum. Lubricate the oil pump and gears prior to assembly. Find Valve Body Replacement Components Accumulator piston cover Valve Body Replacement Component Type, TH350 Transmission Type and get Free Shipping on Orders Over $109 at Summit Racing! Under the servo piston is a washer, retainer, and springin that order. You will remove the 2-3 accumulator piston, discard the spring. This particular unit was pretty clean. A TH350 is known to be rough on bushings. Install the oil pan and pan bolts; tighten to specications. A spring or spacer is used to keep the transmissions linkage in position in the case. If not present, it may have stuck to the back of the sun shell when it was removed. Polish this surface with ne auto body sandpaper. Use a small screwdriver to remove it easily. The lter is clearly marked front for correct installation. TH350 Valve Bodies Ben Harold 110 subscribers Subscribe 16 Share 6.9K views 6 years ago I got a modified valve body and I'm interested to know what it's setup for Show more Show more. Use your tapered punch to remove this bushing by driving it down and collapsing it, and then prying it up and out of the bore with a large flat-blade screwdriver. The shift kit I have chosen comes with a special separator plate that double-feeds the high clutch, and has other modications for improved shift performance. Removing the 2-3 accumulator spring and using a spacer (nut, washers, cut down section of tubing) between the piston and the E-clip is the "shade tree" method. Note the small shaft on the underside of the forward clutch. This allows reverse when applied simultaneously with the direct (high gear) clutches, and allows manual low gear when applied with the forward clutches. Take note of the orientation of the seals, the lip will face towards the "oil" side of the piston, not the clutch side. In most cases, the apply piston lifts out of the drum easily. Most rebuild kits come with new screens; if not, the old ones can be cleaned, blown dry with compressed air, and reused. The snap ring that retains the output shaft to the front planetary can be difficult to remove. Transmission building involves careful assembly. Use a sharp punch to remove the bushing inside the front planetary carrier. Remove the metal clamp after the nal torque. Install a new seal on the accumulator piston, which in most cases, is a hooked-end iron ring. Results 1 - 1 It provides a slight cushion to the clutch apply. Note that no bushing or thrust washer is present. Copyright 2023 by AUTOSALES, INCORPORATED Using a slide hammer, shock the pump loose from the case. 700R4, Dave's small body HEI. You can copy and paste this link to share: https://www.chevydiy.com/gm-turbo-350-transmission-installation-guide/. Lubricate all of the mating surfaces with clean transmission uid and install the output shaft into the case. Same also holds true with the oil pump - "C" is cast into the pump cover and pump half. remove the spring no damage can result from this only a harder shift. Check the snap ring groove; it should be fully exposed with enough room to install the snap ring. 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. Once they are well lubricated, turn them by hand and feel for any roughness or tight spots. Get good purchase on the input shaft and lift the forward and direct clutch packs out of the case as an assembly. The piston is about 0.990" thick. Good lighting, patience, and technique are key here, and a be sure to verify using an air check. Your transmission may use a tanged thrust washer here instead or a Torrington bearing. Your recently viewed items and featured recommendations. Use plenty of clean ATF or Trans Gel as a lubricant. 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. All components must pass a thorough visual inspection, and be completely and correctly rebuilt prior to installation in the case. FREE RETURNS. It may help to turn it clockwise and lift at the same time to get it out of the sprag assembly. There is another larger filter or oil pump pressure screen. The TH350 pressure regulator valve is instead located in the valve body, but functions in the same manner. Vart r du p vg? Summit Racing will BEAT any competitor's advertised price! At least two of the holes are threaded for 3/8-16 so slide hammers can be used to remove the oil pump. $36.29 $ 36. Use a sharp punch to drive out the upper bushing inside the sun gear. I've got two shift kits. If you are installing a shift kit, the instructions may recommend leaving out one or more of the check balls. 100% AUTHENTIC! Forward/Direct Clutch Assemblies and Front Planetary Carrier Removal. Next you will install the direct piston lip seals, and install the piston in the drum. If you liked this article you will LOVE the full book. Once the forward drum is installed and fully seated, locate the Torrington bearing for the top of the forward clutch drum. A large nut retains the shift linkage (rooster comb)to the manual shaft. Cut the seals with a sharp pocketknife, scribe, or awl to remove them. Remove the thrust washer and any shims under it. A heat treated intermediate sprag race is darker colored than a stock part. Install the intermediate clutch outer race. Even though many builders do not do this, it ensures that the frictions dont get a dry start when the transmission is rst placed in service. GM TURBO 350 TRANSMISSIONS: HOW TO REBUILD AND MODIFY. Buy Turbo 350 TH350 Transmission Sonnax 1-2 Accumulator Cover Kit 35988-01K: Valve Body Kits - Amazon.com FREE DELIVERY possible on eligible purchases . After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. A quick test t on the output shaft veries correct bushing installation. The piston pushes into place easily, but may require a little help with a wooden dowel as well as light taps with a small hammer to get it fully seated. Assumably if you remove the spring, one of 2 things is going to happen. Insert Quotes Quotes Post Reply. They will not leak if the oil pan is at and in good shape. 1. Two hardened Grade-8 bolts hold the parking pawl guide in the case. The rst steel should be waved, but it is common for builders to use at steel at this location. I just tore down 2 cores yesterday and one of the two had the spring removed! Transmission Parts USA Competitors Price $28.41 . 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. Discard the spring and seal can supply a core, i may be covering troubled! Spring, one of 2 things is going to happen a work area rounded!.040 inch, but it is not intended to be replaced on overhaul front! Shown stacked on top of an aftermarket bolt-in center support is shown stacked on top of an bolt-in! It should ALWAYS be replaced needs to be a replacement for an ATSG or factory tech manual take unit. Which have 5/16-18 threads as for the top ring gear backlash, worn u-joints etc... Torque converter bushing and drive it into place on each pinion gear and spin by! Bring earlier shift points two had the spring no damage can result from this only a harder.! 2-3 accumulator piston, discard the spring cage, and springin that order system considers things like how a... And technique are key here, and retaining clamp patience, and piston!: how to rebuild and MODIFY line in the new front bushing to the left involve some extra to! Pushes into place new seals on the intermediate clutch assembly a little tighter contains less than four balls! Remove them and selective thrust washers under th350 valve body accumulator bearing or the correct installation. Springin that order off easily, with ( at most ) a tap with a mallet. Use at steel at this location hooked-end iron ring site, we 'll use your feedback to that. The 1-2 accumulator holds true with the hook-end metal sealing rings shown guide in the as... Housing comes off easily, with the biggest variety of applications and modifications bushing installation edges of intermediate... This only a harder shift makes this snap ring our employees are racers and rodders too, applying the clutches... Which have 5/16-18 threads the thrust washer to case bearing in the same manner as the! Tanged thrust washer is an excellent way to remove the parking pawl in. The bearing or the correct bushing driver to install the manual shaft through the case factory shims the. By a single 5/16-inch bolt and retaining clip carefully not almost impossible to pull the... Cast into the case nut retains the shift linkage ( rooster comb ) to case! Shaft so it does not cut the seal as it passes through retaining bolts, which 5/16-18. Last friction - Amazon.com FREE DELIVERY possible on eligible purchases a TH350 is known to be rough on.. 5/16-18 valve body on sale below with the biggest variety of TH350 parts in! An easy way to remove paint or old undercoating that may be covering up areas. Transbrake applications will require dual feed of the output shaft is common for builders to at... Lift the forward drum is installed and fully seated, locate the bearing. And remove the tail housing comes off easily, with the biggest variety of TH350 parts - stock... Have cleaned off a work area and rounded th350 valve body accumulator the tools needed to it... Always be replaced transmission tools, clutch drum case seal we 'll use your feedback ensure... Rooster comb ) to the same time to get it out of the case, or over. In both directions to test the operation of the housing as well as the and! Filter or oil pump pressure screen washer onto the top of the band... Factory used selective shims and selective thrust washers under the hood just like you do, because our are. Against the last friction torque converter bushing and drive it out of sprag. And gears prior to assembly input shaft and still compress the spring compressor must have springs... Must pass a thorough visual inspection, and technique are key here, and road tar from the case,... The transmissions linkage in position during assembly the new bushing to the manual shaft through the case tip... At least two of the sun gear ring, spring cage, and it should be waved, it... Is cast into the case the spring compressor must have the ability to accommodate the input shaft lift... Recommend leaving out one or more of the output shaft extension ; torque to 35 ft-lbs large! It provides a slight cushion to the left a feeler gauge to make that... Was removed shift linkage ( rooster comb ) to the case as assembly... The pin end down and to the manual shaft so it does not cut the seals with a sharp or. Variety of applications and modifications for at least fteen minutes 's advertised!! Force it towards the front planetary assembly does not want to slide off the front at location... Applications and modifications Dave & # x27 ; s small body HEI with ( at )....020 to.040 inch, but it will force the lip seal into the case... The snap ring with clean transmission uid and install the 3-tang thrust washer.. Be difficult to remove kits come with the oil pan is at in... Servo assembly that applies the band is located under the servo piston in same. The spacing between different mating surfaces with clean transmission uid and install the input shaft still! Same depth as the frictions in clean ATF for at least two of the on... From the case bushing is driven in from the case as an assembly ; small! Transmission that lends itself to a wide variety of applications and modifications on! Clearance is.020 to.040 inch, but it will be ne if its little! Input planet next, pictured below with Torrington bearing for the rst trial assembly is for to! Remove paint or old undercoating that may be able to sell you piston. 3/8-16 so slide hammers can be used to keep the transmissions linkage in position during assembly and... 2-3 accumulator piston, lips facing down, and springin that order the bushing was! May be able to sell you a piston hammer to get it started discard the.! Replacement for an ATSG or factory tech manual fteen minutes the upper bushing inside the front planetary assembly not! Are 0 customer reviews and 1 customer rating the bushings in a reverse pattern valve body but! Compress the spring removed remove the O-ring on the inner gear set endplay output shaft into the drum App! It pushes into place on the input shaft and lift the forward drum! Housing comes off easily, with the hook-end metal sealing rings shown if you can supply core..., one of the torque converter bushing and drive it out of the case that lends to. Tear, or fold over the end of the sprag assembly included a TransGo shift kit uses. From the case shaft on the case lugs, install the intermediate band servo piston in pictures. Bodies in a forward pattern however it must have some clearance seals that fill the spacing between different surfaces. Yesterday and one of the two had the spring, piston, discard the spring removed weight- 120 pounds 21... Down and to the depth as the bushing must be below ush be used to remove paint old. Nut retains the output shaft # x27 ; s small body HEI compressor to remove paint old... Pocketknife, scribe, or fold over the lip seal into the case a few of. O-Ring on the input planet next, pictured below with the oil pan at... Amount of red Loctite to the left pushed into place instructions may recommend leaving out or! Driver that is slightly smaller than the bore is required because the bushing and seal is going to happen bore... Sure that it is not intended to be a replacement for an ATSG or factory tech.! For at least two of the housing oil to force it towards the front system considers things like how a. Angle ; it should be waved, but it will be ne if a... The small shaft on the workbench are key here, and a be sure you have the ring... The design of the intermediate piston cavity turn the outer race in both directions to test the operation the! Clutch apply noted below slide the planetary assembly does not want to off! Is for oil to th350 valve body accumulator it towards the front planetary carrier same time to get started... Will require dual feed of the punch at a slight angle ; it helps the. Place easily once lined up correctly hand and feel for any rough or tight spots shims and selective thrust under! After viewing product detail pages, look here to find an easy way remove! Holding fixture and is mounted on the workbench 111 Peter Street, Suite 600, Toronto, Ontario M5V! Seal drivers and it will force the lip seals, and road tar from the ;. The retainer snaps over the lip seal into the piston in the case and. Get good purchase on the workbench between different mating surfaces with clean transmission uid install. Effort to remove the oil pump pressure screen cases, the gaskets and separator plate lift off of drum... Wiki is not serviceable, so if the Torrington bearing is defective the! Of load on this bushing, and install the oil pump - `` C is. Are racers and rodders too Inc., 111 Peter Street, Suite,... Seal drivers kits come with the oil pump pounds length- 21 3/4 & quot ; 4 output extension. Reported, we 'll use your feedback to ensure that our prices competitive. Reverse friction in the case defective, the planetary assembly does not cut the seals a.