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

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 …

Stepping up in strength and capability, the Turbo 400, or TH400, is renowned for its resilience under pressure. This three-speed automatic transmission has been the backbone of many high …

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) …

ATI now has an answer for this market and offers three variations of a 2-speed Turbo 400! OEM cased units are rated to 1800 HP and not intended for heavy weight cars. ATI SuperCase recommended …

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 …

The TH400 is highly regarded for its strength and reliability, even in heavy duty applications. Its central design would become the foundation of late model overdrive transmissions used in GMC and …

From mild to wild, our lineup of TH400 transmissions are ready to handle up to 2200 horsepower no matter the application. Whether you’re on a prepped surface, a concrete patch, dirt, an oval or …

We offer a TH400 setup for Rockcrawler and off-road applications. This is similar to our Stage I build but uses a HD “K” case 4×4 TH400 core with a reverse pattern manual valve body that retains engine …

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.