GM 4-Speed RWD

Electronically controlled, automatic overdrive transmission with TCC

1991-Present
 

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Production of the 4L80E transmission began in 1991. The 4L80E is easily the most powerful GM RWD transmission on the market today. The 4L80E is a redesigned, fully electronic version of the former TH400 transmission that was produced from 1969-1986.

The GM 4L80E is only used in heavy-duty GM applications, notably the Tahoe, Subarban, Excursion, Hummer, GMC Sierra, GMC Savana, C/K Pickups & heavy-duty Chevy Vans. The 4L80E is also used in school bus & motor home applications. Foreign applications include Aston Martin & Rolls Royce.

There are 3 interchange rules for the 4L80E. First year of production, 1991, is by itself. 1992-1996 interchange, and 1997-Present interchange.

Performance parts are readily available, but not much has to be done to these transmissions to allow them to handle 600+ HP. Not cheap, but the 4L80E is a great transmission swap for extreme duty muscle car restorations and for drag racing applications that want to retain overdrive.