How do I identify a TH400 transmission?
It is identified easiest by its “375-THM” designation cast in the underside of the tail housing. The TH475 was an extra-heavy-duty version, and was found in larger trucks from 1971 on. If you are trying to determine the TH400 from another in a vehicle, a fast way to tell is to look at the kick down mechanism.
How do I know if I have a TH400?
Th350 has the vacuum modulator in the back, and the TH400 keeps it on the side. Using the pan bolt pattern is the easiest way to identify the TH400. Both the TH350 and TH400 have a similar look. They utilize a kick down cable, and they both use the same bellhousing bolt pattern.
Are all Turbo 400 the same?
They are, for the most part, interchangeable on the same vehicles; however, you would normally find the TH400 in larger engine applications because they are able to function more reliably at higher engine rpms.
Does a 400 Turbo transmission have overdrive?
The Turbo 400 has earned the reputation of a tough, reliable transmission that can survive harsh duty, but is there a better alternative? Although not often considered as such, much like the Turbo 400, the 4L85E is a solid contender for use in heavy, high-horsepower vehicles, and has the added benefit of an overdrive.
How strong is a TH400?
The GM TH400 transmission is a three-speed automatic transmission that was longitudinally positioned behind the engine. This placement is aimed at providing the best power ratio and durability for rear-wheel drive. The TH400 has been rated at 450 ft. lbs.
What is the difference between TH350 and TH400 Trans?
The TH350 uses a mechanical kick down switch , whereas the TH400 uses an electric one . The electric kick down is much easier to set up, espescially if you are doing an LS Swap, They do both have an aluminum case, and three forward gears. Although the gear ratios are nominally different.
How much does a TH400 transmission weight?
Some areas are cast iron, such as the center support for the transmission. The TH400 is 24.37″ long and comes in at a weight of 135 pounds dry. This transmission does vary in the amount of fluid required, based on certain specifications such as which torque converter is used.
What are torque specs on a TH400 transmission?
The TH400 is an automatic shift, three-speed, longitudinally positioned transmission. It is widely regarded to be a supremely durable and legendary transmission. The TH400 is conservatively rated at 450 ft. lbs . of input torque. Aftermarket building techniques take it well past that figure.
How many quarts of Tran fluid does a TH400 take?
That being said, a common fill volume is between 11-12 quarts for a stock transmission. The TH400, or Turbo 400, transmission was a 3 speed automatic that was first produced in 1964.