3L80 Transmission parts, repair guidelines, problems, manuals

Transmission general data

3-speed automatic gearbox THM (Turbo Hydromatic) 400, also named as 3L80). Turbo-Hydramatic is a patented name for the family of automatic gearboxes designed and produced by GM.

Number of gearsTransmission TypeDriveTorque (Nm)ATF (full capacity) LATF (change) LATF type
3ATRWD340125Dexron III

Technical issues and repair guidelines

This gearbox 3L80 has a simple and reliable design. All parts are made of solid materials. Shifting of gears is implemented very smoothly and almost unnoticeable. The main disadvantages of this automatic transmission are significant dimensions and weight of the transmission. This transmission is considered to be the most reliable in the history of GM (the most enduring).

Which cars run with this gearbox?