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 …

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) …

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

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 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 …

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 …

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 …

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 …

TH400 Transmissions - Durable, reliable, and ready for action. Perfect for classic Chevy trucks and SUVs. Upgrade your Chevy today!

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