Comprehensive guide to the GM TH400 automatic transmission — specifications, identification, history, and adaptability for Jeep conversions.

These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse. The Turbo-Hydramatic or Turbo Hydra-Matic (THM) …

The TH400 is an aluminum cased three speed automatic transmission that was produced by GM. It was introduced for the 1965 model year and made its debut in Cadillacs, and is respected for its durability …

Note: Any ATI TH400 can be made to PG length for an additional charge. Call and check core availability for 4WD units. Refundable core charge for acceptable transmission core is $250.00, If a …

The TH400 was launched by General Motors in 1964, as a replacement to the ST300 2-speed automatic transmission. It was used in a wide range of vehicles, hence, it was not just exclusive to GM cars.

General Motors TH400 3 speed automatic transmission specs, ratios, and information. The versatile TH400 was used in a variety of applications, including 1982 to 1990 GMC/Chevrolet 3/4 and 1 ton …

The TH400 is a venerable transmission that has its roots in mid-century automotive tradition but has since been modified for modern use. It is an automatic shift, positioned longitudinally behind the …

Sep 11, 2025 · The TH350 and TH400 are GM’s most legendary transmissions. Learn the differences in strength, weight, performance, and applications.

All BTE TH400 transmissions have been dyno tested to ensure proper operation. BTE Racing offers three TH400 transmission options, including street/strip, full manual and transbrake versions.

Originally the TH400 was known as the Super Turbine 400. TH-400 automatic transmissions are a fantastic 3 speed automatic transmission and back up some serious GM torque from the small block …