Install the center support and retaining spring next. Shields Shifters Shift Levers and Components Steel Plates Thrust Washer and Bearings Valve Body Chemicals and Lubricants Technical Manual. Lubricate the sun shell with clean ATF. The front Torrington bearing is installed as shown. They collapse and come out with less effort. Rear port (yellow) is main line pressure. Use a small awl or screwdriver to pry upward on the input shaft as shown. Note that these two bolts are both Grade-8; keep them separate from other bolts, which may be softer Grade-5 material. Clearance of 0.030" to 0.050" is common. This surface is at and, on some models, accepts a tanged thrust washer. The ends of the snap ring should be located between two of the raised areas on the retainer. 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. Coan reverse manual valve body. You may have to push each roller in slightly to get it started. Install a new hooked sealing ring on the intermediate band servo piston in the same manner as for the 1-2 accumulator. This low/reverse spring compressor is a very simple homemade tool. Now you can install the low/reverse clutches, beginning with a steel, then a friction, alternating, ending with a friction. Use a long heavy metal rod to drive in the case bushing. It should be ush with the inner at edge of the counterbore in the sun gear. Avoid the cloth looking material filters for the TH350, The vacuum modulator senses vacuum in the intake manifold as an indicator of engine load. Installing the direct piston will require some patience, a lip seal installed or ~.010" feeler gauge, and a trick I use is a section of plastic cut from a 3 liter soda bottle to use as an outside installer tool. Put some Trans Gel on the backside of the thrust washer and install it on the carrier. Most shift kits come with upgraded separator plate gaskets (right). Drive in a new front seal. Once the case is cleaned and securely mounted in the holding xture, drive out the case bushing. 700R4, Dave's small body HEI. It is somewhat difcult to access after the transmission is installed in the vehicle, so you want to replace it during rebuilding if it shows wear or damage. Always install a new torque converter bushing for any level of rebuild. Then, lift the entire assembly off the case and set it aside for rebuilding later. Check the governor weights and springs, and see that the plunger moves freely. Then the planetary unit. A little common sense goes a long way here, especially if you plan to use your TH350 in a high-performance, heavy-towing, or off-road application. Make sure that the kick-down cable has been removed from the case. Factory clearance is .020 to .040 inch, but it will be ne if its a little tighter. 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. Note that a spring is inside the seal lip. Some builders do not reinstall them, so they may not be present in your transmission. Estimated International Ship Date: On a stock rebuild you would normally install this lip seal. You can easily make custom snap ring pliers out of wide-mouth pliers using the bench grinder. This page has been accessed 508,361 times. 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 Take note of the orientation of the seals, the lip will face towards the "oil" side of the piston, not the clutch side. Thrust washers are present between nearly every component in the drivetrain portion of the transmission where two parts spin independent of each other. Be careful not to drop or bend the valve. This gasket on a TH350 sits against the valve body. The hub end also has the sealing rings for the direct and forward clutch assemblies. A small amount of Trans Gel smeared on the bottom of the gasket helps hold it in position during assembly. Some units used metal rings; others used Teon rings. Place the speedometer drive gear retainer on the output shaft. It may not display this or other websites correctly. Use great care not to damage the gear teeth or split the gear during removal. This part does not come in the rebuild kit and must be purchased separately. Install the oil pan and pan bolts; tighten to specications. 1. It may require a few light taps with a small hammer to get it started. Never miss a sale on new parts, tools, and more! There are two types of intermediate return spring/retainers. Visual shiny spots with no detectable wear are acceptable. Also, a scraped low-reverse friction can be used under the intermediate piston if need be. Lift the sun shell out of the case; it should slide off with little effort. Pull out the low/reverse sprag inner race. Push the band apply servo to the bottom of the bore and observe the band apply through the hole in the case as shown. Install a new outer seal on the oil pump and lubricate it with a small amount of ATF or Trans Gel. No center seal to worry about on a TH350, it typically already has a 5 clutch pack, except light duty applications. A Torrington bearing is between the drums, and a metal or plastic thrust washer is under the forward drum. Support Plate, Separator Plate, Check Balls and Filters Removal. Once you lift the front planetary out of the way you can see the sun gear. Newer Post . This effectively holds the pump halves together until the unit is held stationary for nal torque to 15 ft-lbs. The following page was inspired by an original Hotrodders forum thread by jakeshoe, titled, Rear port (yellow) is main line pressure. It is best to use two slide hammers and work back and forth between them. Be sure to use some red Loctite on them. Jun 12, 2023 Install the manual valve into the valve body with the S-link; place it carefully into the hole on the end of the valve. The governor is under a cover on the rear drivers side of the case. Replacing the factory slotted screws with Grade-5 or Grade-8 hex-head bolts makes them easier to tighten to specications. Let us know. 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. Because the forward clutch is applied for all forward gears, it only needs some clearance to work correctly. 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. This spring occasionally breaks and requires replacement. Product Code: 300-000T0814A. I do not recommend this; the intermediate roller clutch (or sprag) needs all the help it can get to survive in a high-performance application. Install the snap ring to retain the spring cage, and make sure that the opening in the snap ring does not line up with the raised areas of the cage. Note: Don't assume you need to plug this hole. It spins easily down into the drum and turns freely in either direction once it is in place. Install all of the valve body bolts by hand and be careful that none of them are cross-threaded. The spring is the thing that cushions the pressure curve for oil pressure on the clutches. TH350 Accumulator pry bar. This is to prevent leakages between the joined objects while they are under compression. Please note the DIY cannot just mill the valve body as valves have also been changed in the valve body. Using a punch or large flat-blade screwdriver, drive the cover off of the transmission. Note the depth of the last friction on the outer race. Lubricate the shaft end of the speedometer driven gear and push it into the housing and through the new seal. Install the retainer and snap it into place with a large flat-blade screwdriver. Shift Kit Transmission Valve Body Kits Transgo Shift Kit. Stay at this 3.5-star hotel in Arlanda. Clean and inspect all components, and install new parts where applicable. Use only clean ATF here; do not use petroleum jelly or Trans Gel. This may involve some extra effort to remove paint or old undercoating that may be covering up troubled areas. Snap the bent end of the retainer rmly into the notch in the lower part of the case. K34411AA 6. A large nut retains the shift linkage (rooster comb)to the manual shaft. Remove the roller clutch from the drum. Add to Cart. Our guests praise the breakfast and the helpful staff . Grid 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. Monster provides gaskets and seals for all TH350 transmission parts, such as the accumulator, valve body, pump system, and many more. They should face away from the seal. Remove the metal clamp after the nal torque. You also block the 2-3 accumulator feed hole in the valve body. Lift the intermediate apply piston out of the oil pump housing. It engages with the bushing in the front of the output shaft. 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. Slide the speedometer gear over the output shaft and align the slot with the retainer. Mine is the plastic kind. There are thicker intermediate steel plates available if need to tighten up the clutch pack clearance. The low/reverse clutches do not apply in automatic range 1st gear. It removes the bushing without gouging the case. iron valve body; weight- 120 pounds length- 21 3/4" 4 output shaft extension . Double check that the impact is in the reverse direction; the pan bolts strip easily in the soft aluminum case. Inspect the pinions for damage and endplay, as you did with the low-planetary assembly. Lay out all of the rebuild kits parts on a clean surface. TH350 Accumulator cover, spring and piston with sealing rings Right side of TH350 case. Locate a suitable driver to install the low-planetary bushing. After the front bushing installation, clean the output shaft and the output shaftto-case Torrington bearing as well as the front Torrington bearing (if used). Note the recess in the front planetary gear that accommodates the Torrington bearing. Be careful not to dislodge any of the rollers during this process. 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. Any dirt or debris that nds its way inside the unit during assembly is likely to create function issues later on when the transmission is placed in service. Also be sure on dis-assembly you inspected and replaced as necessary the input shaft to output bushing shown here(red arrow). Next, install the return spring and retainer as shown. Locate the new thrust washer for the sun shell. This requires a 5/16" set screw and proper tap. Cut the seals with a sharp pocketknife, scribe, or awl to remove them. Install the Torrington bearing on the forward clutch drum as shown. 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. Drive the old bushing from the low planetary as shown. They do not need to be removed to get the linkage out. This band provides engine braking in manual 2nd gear.This slides in the case around the direct drum. May consider use of teflon bushing, only a lubrication passage, no pressure, no lateral loading. Please check compatibility before purchasing. 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. Most rebuild kits come with new screens; if not, the old ones can be cleaned, blown dry with compressed air, and reused. Nov 21, 1999 I've got two shift kits. The late retainers will work in a transmission that originally used the early type retainer, but not vice versa. If you slide around the drum, and it catches the seal, it will cut it and then you must get a new lip seal and start again. Unable to add item to List. If you need one email me and if you can supply a core, I MAY be able to sell you a piston. With the snap ring out of the way, the retaining plate lifts right off, exposing the roller clutch assembly. The plastic sleeve design is very durable, you will find professional builders have their own preference. Photo shows accumulator cover, spring and piston (snap ring not shown). Several companies offer an even heavier duty direct drum/sprag assembly. Check the bore in the case for scratches or other damage if the spring was found broken. Notice how the retaining spring also loads the center support against the case lugs, and how much clearance is present. There are HD versions of this braking band. Drop the sun shell/gear in, spinning in the output carrier until it falls in place. Assembled direct drum sprag and race with retainer. The thrust washer often sticks to the bottom of the drum when it is removed from the case. Note the small shaft on the underside of the forward clutch. This feed plate 'dual feeds' the directs, so plugging this hole is unnecessary. Skip to content . Pressure ports are circled. 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. A Torrington bearing is used on later units as shown. A heat treated intermediate sprag race is darker colored than a stock part. Off shore for bushings, filters, metal clad seals . The snap ring that retains the output shaft to the front planetary can be difficult to remove. Install the sun shell and gear into the case. Add to Cart. Install snap ring. Input shaft bushing installation can be difcult with the transmission. Most owners rebuild a small-block or a big-block, and a few enthusiasts rebuild a 6-cylinder. I try to keep a few machined on hand, and machine several at a time when I do so. Make sure that the retainer snaps over the end of the gear as shown. Tighten the support plate bolts to 10 ft-lbs. Image below of an OEM TH350 governor and cover. I'm almost done with the rebuild on my TH350 and I've run into a problem. A scribe or hook makes removing these components much easier. Digital Sales Engineer Emerson - Stockholm, Stockholm County, Sweden. ( 11 ), Estimated USA Ship Date: A spring or spacer is used to keep the transmissions linkage in position in the case. Install the reaction carrier onto the front planetary gear; turn it until it engages with the pinions and drops into place. Remove the four sealing rings from the grooves in the pump support. 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. 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. Look at the park pawl notch to help index it. You will find the TH350 with 6", 9" and 12" tail housings. Turn the outer race counterclockwise while applying downward pressure at the same time. 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). Install the planetary assembly onto the sun gear. Crossmembers. Locate and clean the parts for the manual shaft installation. Look specifically for case lug damage at the center support area and for cracks in the bellhousing area. Install the oil pump band and tighten with a large flat-blade screwdriver. Valve Body. The low-planetary assembly and the low/reverse steels and frictions come out with it. Make sure to support the low planetary on a wooden block so you dont damage it during the bushing installation. Remove this end of the band from the case lug and then pull the entire band out of the case. Install the pump sealing rings. These units can cost $300.00 or more. Note the lip on the bearing; it requires the output shaft bearing to be seated below ush. Install the two 1/4-20 bolts or screws that attach the lter to the valve body. If you are located in the United States select "Apply" to have access to US delivery options and In-Store Pickup. Use plenty of clean ATF, or Trans Gel, on the seals. Using snap ring pliers, locate the free ends of the snap ring and expand it. The design of the OE planet determines bearing or thrust washer use. There will usually be some minor leakage at the sealing rings. Check for excessive output end play. Clean all of the pump parts and place them on a clean surface. Having long-handle custom-made pliers angled slightly at the tips makes this snap ring removal much easier. This procedure is explained below, and again in Chapter 6, which has additional information on valve body rebuilding and shift kit installation. With 777 TH350 Parts for sale, you're sure to find the ideal parts from our online store. ", View as: Note that you start out with a waved apply steel. Remove the spring compressor. It can be started and squared up with a few taps from a soft-faced mallet. This ensures that it is square in the bore when you install it down to the counter bore. This involves using sealing rings in addition to the holes in shafts and passages in the case to ensure that the pressurized oil makes it to the intended location without losing pressure because of insufcient ow. This page was last modified on 10 May 2017, at 09:23. You can also see the braking band installed. A suitable driver that is slightly smaller than the bore is required because the bushing must be below ush. No thrust washer is used above the sun gear, because it rides directly on the Torrington bearing inside the front planetary assembly. Please note that Checkout Prices will be in US Dollars. For racing and heavy towing use, you will want to machine the direct clutch piston down approximately .160" to allow for one extra friction and steel plate for a total of 5 frictions, and 5 steels in the directs. Use the factory shims for the rst trial assembly. Using an air impact gun speeds up the process considerably. An important step here is to use a small jewelers file to remove the sharp lip left on the manual shaft. Something went wrong. Most early units use a tanged thrust bearing here. Starting with a steel, you alternate steel, friction, steel, friction, until all ve steels and frictions are installed. Be prepared and keep a large pan under the transmission the entire time. The head of the bolt can be slotted so a screwdrive can be used. This indicates that it has debris inside or is damaged. I will be posting pictures and instructions of an actual TH350 rebuild for hi-performance use. Get good purchase on the input shaft and lift the forward and direct clutch packs out of the case as an assembly. Using snap ring pliers, remove the snap ring. Slide the speedometer drive gear off the tail shaft. The rear Torrington bearing is installed as shown. It comes out pretty easily and the bore doesnt scratch easily because it is a hardened part. Install the new center support and retaining ring in the same manner that you would install a stock center support. Install the accumulator cover with a new seal on it. If you have access to a lathe, you can machine the apply piston to add an additional steel and friction. So if the intermediate piston is smooth, use the retainer with the springs attached to it. Note that directly under the oil pump and on top of the intermediate frictions is a waved apply spacer. Install the spring, piston, and retaining clip carefully. Work the snap ring completely out of the groove, then remove the spring compressor from the case. FREE RETURNS. Now is the time to air check the low clutches. Be sure that the snap ring is fully seated. This is a pressure switch that was used ~1972-'73 for the Transmission Controlled Spark (TCS) system. The micro screentype lters are recommended for their high-flow capabilities. After viewing product detail pages, look here to find an easy way to navigate back to pages you are interested in. You will remove the 2-3 accumulator piston, discard the spring. Stock measurement is 0.835", machining the piston to 0.685" to 0.720" will allow the use of 5 frictions using 0.070" steels. Take care not to damage the threads where the speedometer cable attaches. $39.99. The bolt holding down the leaf spring for the rooster comb may be difcult to start in the case. Install the snap ring for the backing plate. Use small snap ring pliers. You can buy or make a tool similar to the one pictured below, or use several 5" or larger C-clamps. The case bushing is driven in from the front. Be prepared to replace almost ALL the bushings in a TH350. Soak the frictions in clean ATF for at least fteen minutes. Right side of TH350 case. Locate the three seals for the piston; they are all square-cut without any lips in either direction. Please consider creating a new thread. Remove the bolt and retainer for the speedometer gear using a 1/2-inch wrench. Also check the inside bore of the drum for wear from the sealing rings. Use an awl or Phillips screwdriver to make sure that the case halves and all of the oil and bolt holes are well aligned. This passage may also be plugged by using a roller from a direct drum or sprag to drive into the passage, but this will be a more or less permanent modification due to the difficulty in removing the roller. 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. Place two new seals on the intermediate apply piston, lips facing down. Chevy Muscle Car Tech Tips, Guides, Articles & How-To. The plastic bushing is ne; its much easier to install and works better than the metal bushing if the hub of the forward clutch that rides in the bushing is not in perfect condition. Notice the dowel pins threaded into the case, you use these and the case to align the pump halves. 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. Install the snap ring over the retainer. Remove the thrust washer on top of the front planetary. Apply a small amount of red Loctite to all bushings before driving them in place. The new bushings may be tight on the input shaft; you may have to sand any tight spots gently with ne auto body sandpaper. Helps cure: Destroyed case; Intermediate clutch failure; Worn accumulator bores; Low line pressure; JavaScript is disabled. In the rare application that does not need reverse or low gear engine braking, the low piston and low clutches can be deleted and the feed holes in the case blocked. Install the new bushing to the depth as shown in the pictures. Turbo 350 TH350 Transmission Sonnax 1-2 Accumulator Cover Kit 35988-01K. A forum community dedicated to Chevrolet Chevelle owners and enthusiasts. 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. 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. Stronger springs and heavier weights will bring earlier shift points. 1-2 Accumulator Sleeve Kit 35719-01K. Remove the backing plate from the case. Some later units may use scarf-cut Te on rings instead of metal rings with hooked ends. I also discussed [Click here to read more], The Family Tree Were primed and ready to ship TH350 restoration parts to your garage, fast. The heat treatment makes the race less brittle. One says to discard the spring, the other leaves it in. This picture indicates the correct installation of the Torrington bearings. GM used to use an aluminum piston and then switched to a plastic one. Once the snap ring clears the case lugs reach in with your free hand to pull it right out of the case. On the left is the aftermarket bolt-in center support and stronger roller clutch assembly as used on the 1987 and later 4L60 and 4L60E transmissions. Same also holds true with the oil pump - "C" is cast into the pump cover and pump half. This is a custom order part. Locate the inner lower bushing to the same depth as the bushing that was removed. Minor scratches are okay, but deep grooves here are not acceptable. The lower bushings turn sideways in the bore. Soak the frictions in ATF for at least 15 minutes prior to installation. 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. Click the button below and we will send you an exclusive deal on this book. The manual shaft can now be removed from the case. The direct drum is located behind the oil pump assembly. Once all of the valve body bolts have been removed, it slips easily out of the valve. Once the case has been cleaned, all threads checked and/or repaired, and the rear case bushing installed you can start assembly. Bushings are critical in that they allow the rotating parts to ride true on center, and for the lube to make it to the rear of the trans. These lugs must be installed toward the rear of the transmission, or farthest away from the torque converter hub.
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