What Is a Turbo 400

The GM and Hydra-Matic made TH400 is an automatic transmission. Also erred to as the "Turbo 400," the TH400 is considered very durable and of high quality, according to the auto experts at Novak-Adapt.com.

History

The TH400 started out in 1964 when it was used in Buicks and Cadillacs. After a few years in cars, GM began putting the Turbo 400 in trucks in the 1970s. In 1990 GM changed the name to the 3L80, though the transmission is still being used in GMs heavy-duty vehicles and in military applications.

Specifications

The TH400 weighs 135 lbs and is 24.37 inches long. Encased in smooth cast aluminum casing, the Turbo 400 is GMs largest automatic transmission and features a 3.48, 1.48 and one gearing.

Variations

GM created two alternate variations of the TH400. The TH475 was used in GMs most heavy-duty trucks starting in 1971. The TH375, used between 1972 and 1976, was used in cars with small displacement.

Potential

According to Novak-Adapt, the Turbo 400 is a popular transmission often used in Jeep conversions. Theyve also been used in GM vehicles, Rolls-Royces, Jaguars and even Ferrari models.