Chevy Muscle Car Tech Tips, Guides, Articles & How-To. Search Car Torque Specifications by Engine or Model When fully seated in the transmission, there should be very little room between the back of the torque converter and the oil pump. If the torque converter is too far out of the pump, the inner pump drive gear can be damaged. The bolts need to be torqued down using an inch-pound torque wrench as the torque is quite low. This little detail is often overlooked until thetransmission is bolted in place and it’s time to install and tighten the torque converter bolts. Add 4 quarts of ATF to the transmission and start the engine. of payload down the pavement. It is best to install all of the bolts before tightening them to final torque. Pour at least one quart of ATF into the torque converter before installing it into the transmission. Wrench them on one handed, placing your hand close to the head of the wrench, when your hand cant turn the wrench anymore then they are as tight as they need to be. You will need to go round the bolts several times until they don't rotate any further because tightening a bolt reduces the tension on its neighbour by a small amount. Raise the transmission high enough to facilitate installing the rear crossmember. ... stand the transmission on the tail shaft and carefully install the torque converter onto the transmission. The fine threads have greater holding power than coarse threads, and hardened bolts can be torqued to specification so they don’t come loose. One of the weaknesses noted about this transmission was wobble of th… The NP203 was used from 1971 to 1978. Turn the converter while pushing it rearward at the same time. THM250 Weighing 184 lbs. Made to fit TH350 and TH400 1967-1977. (Click on the name of the transmission you are interested in.) NewYall Rear Transmission Trans Mount for TH350 TH400 700R4. Let the engine idle and continue to add fluid until it is on the lower range of the scale on the dipstick. This ensures sufficient clearance so the slip yoke provides plenty of engagement with the splines but doesn’t bottom out in the transmission. Tap to unmute. In stock on May 4, 2021. The torque specifications for the bellhousing that mounts the transmission to the engine block is 25 ft.-lbs. If the torque converter locks up at any point during this procedure, stop! Do not overfill the unit. Do not attempt to install the transmission unless the converter is fully seated. ( Click here to open a printer friendly page in a new window) General Motors. Verify engine braking in the first- and second-gear selector positions. Im looking at an old Mr Gasket bolt kit here.There's (3) 3/8" X 16 (NC) bolts and (3) 3/8" flat washers.The threaded portion of the bolts are exactley 1/2" long. SHARE THIS ARTICLE: Please feel free to share this article on Facebook, in Forums, or with any Clubs you participate in. Automatic Transmission Dimensions. use a 3/8" wrench attached to a torque converter dust-cover hole using a dust-cover bolt. A piece of aluminum flat bar with a 3/8-inch hole in it works well for this purpose. Written by Cliff Ruggles and Posted with Permission of CarTechBooks. Spin the torque converter at the same time to help align the input shaft and stator splines. Spin the torque converter at the same time to help align the input shaft and stator splines. You are now ready to road test the transmission. This may require considerable effort. Watch later. FREE Shipping. The TH350 weighs 120 lbs. At this point, turn the engine with a large socket on the front of the crankshaft, or with a large flat-blade screwdriver between the bellhousing and flexplate teeth. At first it wasn’t necessarily an automatic in the way that they are perceived today, but rather a clutch-less transmission that you would still have to shift for yourself. Do not attempt to road test the vehicle until the transmission fluid level is within the proper range on the dipstick. (no nuts). It was released for the 1950 model year. this transmission can easily handle power torque ratings up to 650-lbs.ft. This transmission is also known for being strong and versatile, in addition to being quite compact. The 350 transmission is 21-3/4\" long and its one-piece case is cast of aluminum alloy. In almost all cases, plenty of clearance and some shimming of the converter is required when an aftermarket high-performance torque converter is being installed. While the TH350 is no longer in production, the transmission is still used for many classic car builds. Be gentle doing it.Hope this helps. Determine if the filler tube needs to go in before lifting the transmission into place, or if there is room to install it afterward. Use a six-point universal 9/16-inch socket to install them. Sectioning a 1976 TH400 transmission mount. Some units lack sufficient clearance to install the crossmember with the rear transmission mount in place. Make certain that the shifter is in Park, and verify that the parking pawl is engaged before you attempt to start the vehicle. Make small adjustments to the transmission upshifts by simply removing the hose on the vacuum modulator and turning the screw inside the fitting. could end up messing up head. The upper right-hand bolt at the 2 o’clock position passes through the strap on the transmission oil filler tube. If you find that there isn’t enough clearance, or that the torque converter is tight against the flex plate, stop immediately. If the driveshaft is too long, it can bottom out in the transmission and damage the transmission thrust bearings. Pan Bolts use 13mm heads. With the vehicle effectively supported and the parking brake locked, place the transmission in Drive and then Reverse, and recheck the fluid level; add as needed. You’ll see the biggest benefits of using a lift and transmission jack for transmission installation. Use a retaining strap to keep the torque converter from falling out of the transmission until you are ready for the installation. Make sure the filler tube is fully seated into the transmission and that a new O-ring or multiple lip seal is installed. Install at least one bolt on each side of the bellhousing. TH350… If you have installed a TransGo shift kit, be aware that you now have control of manual low and that the transmission will not upshift until you move the lever. Cut off the end and slot it to accept a flat-blade screwdriver for easy removal once the transmission is in place. Check the size of the holes in the flex plate before installing the transmission. Once pulled up against the engine, with at least one bolt on each side, remove the alignment studs and install and tighten the remaining bellhousing bolts. The clearance here should be no less than 1/8 inch and no more than 3/8 inch. Any attempt to pull the transmission up to the engine with the bellhousing bolts can damage the oil pump. Chevy TH350 converters use a bolt and nut, the Buick, Olds, Pontiac TH350 uses a bolt only. This step is extremely important, because the relationship between the converter and crankshaft maintain perfect alignment between the parts. Step 5: The stock TH350 center support is shown stacked on top of an aftermarket bolt-in center support. Continue to add transmission fluid with the engine at idle speed until the fluid level registers on the dipstick, but at the bottom of the range or at about one pint low. Some flex plates do not have the needed bolt pattern for the new converter. The torque converter must be installed and fully seated in the transmission before it can be installed in the vehicle. Drive the vehicle a few miles, gently at first, testing for upshift and downshift points. Use care here to ensure the torque converter doesn’t fall out during this procedure. If a TransGo shift kit was installed, see Chapter 6 for further adjustments such as custom tuning the shift points by changing governor springs, removing the spring under the modulator valve, and adjusting the modulator. This allows some latitude to align the crossmember to transmission mount bolts. If a new torque converter is being installed, be sure to measure the front hub on the torque converter and the recess on the back of the crankshaft. TH350 Automatic Transmissions in-stock with same-day shipping. Note how much longer the rollers are on the aftermarket part. Check the fluid level once again, and add as needed. It’s better to find out that the flex plate holes need to be opened up before you are ready to push bolts through and tighten them up! Help with Ordering Parts for Dodge Jeep A500/A518/A618 Transmissions? To accomplish this, the engine must be rotated. Find this out before installing the transmission and bolting it in place! Soft nuts and bolts will work loose and can cause major problems. Add 4 quarts of ATF to the transmission and start the engine. The transmission jack can be removed at this point. As with most things associated with this hobby, installation takes much longer than removal. Another big problem I’ve seen is with an upgraded torque converter. Once you have installed the torque converter, spin it several times to make sure there are no tight spots or binding. Fast shipping on GM transmission parts and supplies like this GM universal transmission mount found in many 700R4 4L60E 4L80E TH350 700R4 and more applications. The correct tightening of the pan bolts is quite important if you don't want any leaks. The first step in this process is to install the torque converter into the transmission. Lubricate the bearing surface of the hub and slide the torque converter onto the transmission. Once all of the fasteners are installed, tighten the crossmember bolts first, and then tighten the bolts to the transmission rear mount. If playback doesn't begin shortly, try restarting your device. The NP205 was used from 1971 to 1991. GM 5.7L-350ci-V8 Engine Torque Specs. When installing 7/16” bolts to attach the torque converter to the flexplate we recommend that you first enlarge the torque converter bolt holes in the flexplate to an inside diameter of 29/64” (.453”). Install all of the bolts that go through the crossmember to the frame, but do not tighten them. The fittings on the transmission should be held stationary with a second wrench to keep them from moving while the lines are tightened. 99. To help support the socket, wrap it with a piece of electrical tape as shown. The round plate has a frict The TH400s use an electric downshift solenoid that requires a wire to be attached to the terminal on the passenger’s side of the transmission case. Solve the issue of lowering the output of the transmission 1" or more by modifying an OEM style mount. Check the distance between the torque converter and flex plate/flywheel with the torque converter fully seated in the oil pump. The torque converter can be very difficult to install into a freshly rebuilt transmission. This is a critical adjustment and it’s common to have to shim aftermarket torque converters. At the right rear of the case is the modulator.The TH350-C was the lockup torque converter version introduced in the late 1979 model year, and was produced through 1984. If you liked this article you will LOVE the full book. Some aftermarket torque converters require custom hardware. The standard TH350 is still very popular in drag racing. Adjust the transmission jack so the transmission is angled back slightly while it is raised into position. If the driveshaft is too short, it can come out of the transmission when the suspension reaches full height. Used Grade-8 washers as shimming material if the clearance is excessive. Install the transmission cooling lines and tighten securely. if you use both hands you are likely to use exessive force. To help guide the transmission onto the engine, make a couple of guide studs. The final step in the process is to make sure that the notches in the hub engage with the transmission oil pump. Bolt it on. It may not be fully seated into the oil pump. Transmission Crossmembers (6) Bellhousings (4) Torque Converter Upgrade ... Torque Converter, 30-spline, Furnace-brazed, 10.750 in. If the torque converter is new, and a new bushing was installed in the oil pump, the torque converter has a relatively tight fit, and it can be considerably difficult to install. This guarantees that the next hole is well aligned to start the bolt as the engine is turned. The first step in this process is to install the torque converter into the transmission. That was considered a luxury.That lasted until the 1953 model year when it became truly automatic. The lock-up torque converter was unpopular with transmission builders B&M Racing once marketed a conversion kit for THM350-Cs during the early 1980s until the advent of high stall lock-up torque converters when its overdrive counterpart (THM700R4/4L60) were modified. The TH350 was popular for a variety of reasons. Over 6,000 Automotive Torque Specs. Test fit for drive- shaft length. Some installations require shimming. Soft bolts do not hold sufficient torque and should never be used to hold a torque converter to the flexplate. FREE Shipping by Amazon. Install the torque converter dust cover and engine starter if it was removed. Torque specs for these bolts are 12-13 ft.-lbs for the Turbo 350 and 400. $29.95 $ 29. Pour at least 1 quart of clean ATF slowly into the torque converter. Part Number: AAF-ALL26906. A tip: slowly pour a quart of trans fluid into the torque converter before inserting the torque converter into the transmission. Once lowered onto the crossmember, install and tighten the transmission’s rear-mount bolts. The lockup converters use metric bolts.... Click to expand... Bingo. Once it’s fully seated, there is very little room between the back of the converter and the oil pump. Share. Use Grade-8 material here. There must be some clearance here, or the oil pump and/ or the engine thrust bearing can be damaged. Angled correctly, it is like keeping a finger gently pushing against the converter, lightly holding it in. 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