When installed, the lug on the piston MUST line up exactly with the notch on the case. Next goes in the output planetary to output ring gear bearing or thrust washer (depending on year). The bushing is driven in ush. Hughes, TCI and Boss Hog make TH350C torque converters. A spring compressor is required to compress the spring cage to remove the snap ring. Use a push-in technique more than a work-around-the-drum technique. The vacuum modulator is located on the rear passengers side of the case. As the throttle is opened, vacuum decreases. Remove it with a small screwdriver or scribe. Notice the open line in the gasket that will parallel the support plate that bolts on at front of the valve body. Drive two new bushings into the lower end of the stator. Remove the spool valve and S-link from the valve body and set them aside to avoid damaging them. It may stick to the gaskets and tear them during removal. Something went wrong. 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. Take care not to damage the threads where the speedometer cable attaches. You are using an out of date browser. Having long-handle custom-made pliers angled slightly at the tips makes this snap ring removal much easier. Lower the valve body onto the case. A later-model spring cage is shown with the springs attached to the cage. Measure the additional thickness of the extra friction and steel, then cut the exact amount needed to leave you the exact clearance you desire. Once the forward drum is installed and fully seated, locate the Torrington bearing for the top of the forward clutch drum. Then install the small outside snap ring to hold it all in place. Apply a small amount of Loctite to the bushing. 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. Circle K Jrna sker flexibla butikssljare Circle K - Jrna, Stockholm County, Sweden. A retainer is used to secure the cover. Tail Housing and Speedometer Gears Removal. 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. Vart r du p vg? Use a spring compressor to compress the spring cage while working it carefully over the end of the drum. 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. Used on 208 transfer case with adapter. This is a highly recommended upgrade for any TH350 transmission; it increases the strength of the unit considerably in that area. Jump to Latest Follow 1 - 2 of 2 Posts. Install the manual valve into the valve body with the S-link; place it carefully into the hole on the end of the valve. As you apply air to the correct passages, you will see and hear the drums apply the clutches. Lubricate the case bores and the 1-2 accumulator seals with clean ATF. Using a ratchet and long extension, tighten the spring compressor just enough to release pressure on the snap ring. One reason is the accumulator protects the failure-prone intermediate sprag and another is the spring keeps the cover loaded against the snap ring. There is a lot of load on this bushing, and it should ALWAYS be replaced on overhaul. 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. Locate the new thrust washer for the sun shell. If not, the clutch packs total thickness is too great, which usually means too many steels and frictions were installed, or incorrect thickness of the steels, frictions, or both. Install snap ring. 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. You are now ready to rebuild and install the forward clutch assembly. Be prepared and keep a large pan under the transmission the entire time. We use encrypted SSL security to ensure that your credit card information is 100% protected. Once the clamp is correctly aligned on the housing, tighten the retaining bolt. 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. Soak the frictions in clean ATF for at least fteen minutes. Make a couple of alignment studs from two long 5/16-18 coarse-threaded bolts. Note: Don't assume you need to plug this hole. See each listing for international shipping options and costs. Th 350 Accumulator Piston 2-3 Wspring Aluminum Late For Valve Body. This causes undue wear on the internal transmission parts, rear differential and axles, drive line and u-joints. We'll be back on Monday, January 3! Lubricate the outer rubber seal and sealing rings with clean ATF. Stay at this 3.5-star hotel in Arlanda. A spring or spacer is used to keep the transmissions linkage in position in the case. I have cleaned off a work area and rounded up the tools needed to take the unit apart for inspection. Drive the new bushing ush with the inner bore of the housing as shown. There is another larger filter or oil pump pressure screen. Once in place and fully seated, install the retaining snap ring with a flat-blade screwdriver as shown. Turn the outer race counterclockwise while applying downward pressure at the same time. Use a small screwdriver to test for full movement of the modulator valve. Use a sharp punch to remove the bushing inside the front planetary carrier. Use a suitable driver to install the manual shaft seal into the case. Products with electrical plugs are designed for use in the US. Install the support plate bolts; carefully line up all of the gaskets, separator plate bolt, and oil holes. 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. The thrust washer under the sun shell may be either plastic or metal. A longer 4x4 output shaft was used for around 1.5 years. 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. Once the spring compressor is out of the way, you can remove the snap ring. Your recently viewed items and featured recommendations. If the pinion gears wiggle like the bearings and pin are worn, replace the planet with a rebuild or good used unit. 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. 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. This page was last updated: 18-Apr 07:36. These lugs must be installed toward the rear of the transmission, or farthest away from the torque converter hub. Note that all of the steels for the intermediate clutch pack have a notch as shown, which is installed in the lower right of the case. Also be sure on dis-assembly you inspected and replaced as necessary the input shaft to output bushing shown here(red arrow). Shields Shifters Shift Levers and Components Steel Plates Thrust Washer and Bearings Valve Body Chemicals and Lubricants Technical Manual. I also provide specific guidance and tips along the way to make the job easier. Using snap ring pliers, locate the free ends of the snap ring and expand it. I also discussed [Click here to read more], The Family Tree Install the intermediate clutch outer race. Install the forward clutch pack steels and frictions. Brass screened filter allows for more flow. iron valve body; weight- 120 pounds length- 21 3/4" 4 output shaft extension . Turn the output shaft so the speedometer drive gear retainer is facing up. Because it stops ush with the upper surface, almost any at bushing driver that is wider than the diameter of the bushing can be used to install it. Drive the old bushing from the low planetary as shown. Install the oil pump pressure screen/lter into the case. There are Alto red frictions in this unit, however a stock tan clutch ( like Borg Warner brand) is more than adequate for even very high HP cars. Rest the gear on a block of wood or shop towel to help you avoid damaging it. Once the case has been cleaned, all threads checked and/or repaired, and the rear case bushing installed you can start assembly. Front Planetary and Sun Gear Assembly Removal. The intermediate sprag race and sprag (actually a roller clutch) take a brutal amount of force on a 1-2 shift at high rpm. . You may however need to work the exposed part of the seal into the drum with the feeler gauge or seal tool. Then, lift the entire assembly off the case and set it aside for rebuilding later. Please try again. Install the planetary assembly onto the sun gear. Two filters were used in the case under the separator plate. Notice the scraped and split low reverse friction in the intermediate piston cavity. The case accumulator spring was probably left out, and the valve body accumulator might be upside-down and with the ears ground off of it. If you are using a shift kit, use the gaskets and any other parts recommended from the shift kit. It is best to use two slide hammers and work back and forth between them. Compress the 2-3 accumulator piston and install the retaining clip. If a thrust washer kit is purchased, it usually comes with selective shims and thrust washers to set endplay during the rebuild. Slip the band over the direct drum and align it with the notch in the case. They do not interchange during the rebuild without changing to a different style planetary gear that accommodates the tanged thrust washer. You do not have to take it apart except where noted below. It is held in place by a single 5/16-inch bolt and retaining clamp. Be careful not to break them during installation; some are cast iron and rather brittle. With the snap ring out of the way, the retaining plate lifts right off, exposing the roller clutch assembly. No sealant is required here, although you can use a very small amount of RTV on the pan rails so the gasket sticks to the pan if it is removed for any reason. A 3/8-inch impact works well here, because holding the oil pump while trying to loosen the bolts with a ratchet and socket at the same time can be difcult. 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. There are thicker intermediate steel plates available if need to tighten up the clutch pack clearance. The modulator on the transmission will raise the main line pressure in the transmission. A notch references the location of the steel in the case, even though they only install one way. Grasp the servo assembly by the apply pin and remove it from the case. Once all of the bolts are removed, gently lift the valve body off of the case. 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. A bearing will not fit a thrust washer design planetary unit with out machine work. Estimated International Ship Date: Apply a small amount of red Loctite to the new bushing and drive it into place. Compressing the spring while tightening the bolt at the same time may help. 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. Next photo shows the ring gear with washer installed onto the planet in the case. A Torrington bearing is used on later units as shown. Minor scoring can be smoothed down. Good lighting, patience, and technique are key here, and a be sure to verify using an air check. Insert Quotes Quotes Post Reply. It should be just below the oil supply hole, not blocking it. Most handles on bushing driver sets are far too short. Be sure to install it as shown, with the housing facing up or toward the rear of the transmission. Grid It is the single weakest part of a TH350. Be sure it is smooth. The case has a "C" cast into it, and there will be an electrical plug adjacent to the shifter shaft on the driver side of the tranny. I address each part individually as I proceed with the assembly. 700R4, Dave's small body HEI. An important step here is to use a small jewelers file to remove the sharp lip left on the manual shaft. Install the spring, piston, and retaining clip carefully. Under the servo piston is a washer, retainer, and springin that order. There will usually be some minor leakage at the sealing rings. You can omit the center seal, plug this passage, enlarge the 2nd and 3rd feed holes in the stock separator plate and you will have greatly increased the torque capacity of a stock TH350 as well as gained a firmer shift. Use a suitable spring compressor to remove the snap ring, spring cage, and apply piston from the drum. Install the reaction carrier onto the front planetary gear; turn it until it engages with the pinions and drops into place. The low/reverse clutches do not apply in automatic range 1st gear. This is located on right side of transmission case. Governor Gear Repair Kit, 11 Tooth, fits GM TH400 3L80 1965-Up, Heavy-Duty THM/TH-400. Please try again. 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. 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. Carefully push the roller clutch assembly onto the drum. Replace the bushing in this planet.Check planet pinion gears for side to side movement. Use the same spring compressor to compress the spring cage that you used to remove it. Forward clutch pack clearances can be tighter than usual; however it must have some clearance. If you do not get complete engagement, the input shaft will not turn when you install the pump and begin to tighten it. If too tight it can creep in neutral. Save Share. Install the snap ring over the retainer. The Fora platform includes forum software by XenForo. Gear ratio and tire size will also play apart of the shift points and changes made. You can also block the feed in the valve body to the 2-3 accumulator. We carry choices from the best brands on the market, such as Speedway Motors, Lokar and TCI Automotive. Get plenty of lubricant on the inner bushings and on the lower area that comes in contact with the thrust washer. 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. Apply a generous amount of ATF or Trans Gel to the seals and inside the pump housing. Check the output shaft for proper rotation, there will be some drag, especially in one direction. Remove the roller clutch from the drum. The unit considerably in that area transmission the entire assembly off the case between them be minor! 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