Chevy Turbo 400 Automatic Transmission Information

by Richard Rowe
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Image by, courtesy of r.modys

Chevy's Turbo Hydramatic 400 (TH400) transmission is one of those legendary pieces of equipment that helped to define the muscle-car generation, and it continues to be one of the most common and highly regarded transmissions in today's enthusiast market.


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The TH400 (then called the Super Turbine 400) was originally introduced in 1954 for use in full-sized Cadillacs and Buicks. The design remained almost completely unchanged from its inception to 1991, but it was renamed 3L80 in 1987.

Basic Description

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The TH400 is a GM three-speed automatic transmission, used in high-performance and high-torque applications.

Chevy 400s

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You can differentiate the Chevy TH400 from the Buick-Olds-Pontiac transmissions by its specific bell-housing bolt pattern and the fact that it only came with 4-inch/small-yoke or 9-inch/large yoke tail-shafts.

Non-GM Applications

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The TH400 has also seen use as factory equipment in military vehicles, full-sized Jeeps, Ferraris and V-12 Jaguars.


The TH400 was replaced by an overdrive evolution of itself in 1991, called the 4L80E.

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