Turbo 400 Performance Specs The Turbo 400 is rated conservatively at peak torque of 450 lb-ft. Use a generous amount of transgel to hold all three parts together and in place while the center support is lowered into the case. Use a small amount of lubricant to avoid damaging the O-ring during installation. Step 6: Modify Valve Body Professional Mechanic Tip Some aftermarket shift improver kits contain a modified 1-2 shift valve top left and plug for the bleed hole in the valve body. Inspect the Torrington bearing assembly, and replace it if needed.
Yeah, the top ones seem fine. Let the engine idle and continue to add fluid until it is on the lower range of the scale on the dipstick. That being said, a common fill volume is between 11-12 quarts for a stock transmission. Once fully seated, install the retaining ring with the open section toward the area of the case where no case lugs are present. Note the orientation of the drum with the low band. Find out more about your Turbo 400 transmission and how to identify it below.
Step 2: Install Governor Inspect the governor drive gear for wear and replace it if the gear teeth show wear or damage. Adjust the transmission jack so the transmission is angled back slightly while it is raised into position. Install the entire assembly into the case using a new metal gasket between the cover and the case. The inner gear drive always faces away from the torque converter. This 3 speed transmission has its gear ratios defined as 2.
Step 3: Install Speedometer Gear Housing Place a new outer seal onto the speedometer gear housing. Step 3: Install Sealing Rings Install four sealing rings into each ring groove. Make sure that the notches in the hub engage with the transmission oil pump. Leave the level about 1 pint low to allow for expansion of the fluid when the transmission heats up. Some units lack sufficient clearance to install the crossmember with the rear transmission mount in place. Step 10: Install Front Seal Apply a drop of Loctite to the front seal, and drive it into the pump housing until fully seated.
Several different clutch pack configurations were used for various models, so pay close attention to what was removed from the original drum, so the total clutch pack thickness can be duplicated during the rebuild. If you force the tubes into position, they bend and leak. Gently tighten all of the retaining bolts evenly, and then torque them to 15 to 18 ft-lbs. That being said, this transmission is commonly used in hot rods and paired with engines making far more torque, although these transmission also must commonly updated with some aftermarket parts. Drive in a new bushing and seal. I'll get some new bolts tomorrow, throw them in and tighten all of the existing bolts.
Step 3: Remove Seals and Bushing Remove the outer pump sealing ring. Slide the transmission forward on the alignment studs and onto the dowel pins. Every automatic transmission will need a universal clutch spring compressor as well as snap ring pliers and pic sets for removing valve guides. Install a new sealing ring on the accumulator piston, and re-install it into the valve body. That being said, a common fill volume is between 11-12 quarts for a stock transmission. Using a seal installation tool, install the apply piston into the drum, making sure not to cut or fold over the lip seals during installation.
This transmission eventually made its way into many of the truck applications for General Motors. Apply a small amount of red Loctite to the new bushing and install, driving it flush with the upper edge of the bore. With many modern vehicles, the curve of the bellhousing and proximity to the firewall does not allow the tube to be installed after the transmission is in place and bolted to the engine. The Th350 is basically a square with a corner taken out of it. This Tech Tip is From the Full Book,. The became the 4L60 and so on.
Th375 and Th475 There are were a few one of versions of the Turbo 400 as well. Step 2: Remove Apply Piston Remove the apply piston retaining ring, springs, spring carrier, and apply piston from the center support. The pin can still be installed with the pump in place, but it has to be bent and then straightened again. Install Exterior Components Step 1: Install Modulator Valve Install the modulator valve into the case. This is a durable and very well-known transmission, as it was in production for many years and applied to a wide variety of vehicles, not only General Motors.
Install the piston return springs. Step 12: Install Crossmember Bolts Install all of the bolts that go through the crossmember to the frame, but do not tighten them. It can support the weight for hours and lift the unit slowly into place while you get everything lined up and other items out of your way. Install Filter and Valve Body Step 1: Install Filter and Valve Body Locate the upper and lower separator plate gaskets. Materials and Size The Turbo 400 is primarily constructed of cast aluminum, with the bell housing being integrated into the transmission and also made of cast aluminum.
The transmission was not exclusive to General Motors, as many luxury brands such as Jaguar, Ferrari, Rolls-Royce and many others made use of this transmission. Steel plates could be in several different thicknesses, and as many as six friction plates could have been used in the direct drum. Good way to crack the transmission bell on the 400's. There are 13 bolts on the pan underneath the transmission. It is a good idea at this point to test fit them by sliding the lower housing down over the forward drum input shaft.