GM 4L80-E transmission

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4L80-E/4L85-E
Overview
ManufacturerGeneral Motors
Production1991–
Body and chassis
Class4-speed longitudinal automatic transmission
Chronology
PredecessorTurbo-Hydramatic
Successor6L80/6L90
 
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4L80-E/4L85-E
Overview
ManufacturerGeneral Motors
Production1991–
Body and chassis
Class4-speed longitudinal automatic transmission
Chronology
PredecessorTurbo-Hydramatic
Successor6L80/6L90

The 4L80-E (and similar 4L85-E) is a series of automatic transmissions from General Motors. Designed for longitudinal engine configurations, the series includes 4 forward gears. It is an evolution of the Turbo-Hydramatic 400, first produced in October, 1963. 4L80-Es have been optioned only in Chevrolet/GMC pickups, vans, and commercial vehicles, and the Hummer H1.

The 4L80 and 4L85 are built at Willow Run Transmission in Ypsilanti, Michigan.

Gear ratios:

1234R
2.481.481.000.752.07

4L80-E[edit]

The "MT1" 4L80-E is able to handle engines with up to 800 foot pounds of torque. Final drive ratios include 3.42, 3.73, and 4.10.

Applications:

4L85-E[edit]

The "MN8" 4L85-E is able to handle vehicles from 7200 to 16,500 lb (3265 – 7483 kg) GVWR with up to 460 ft·lbf (624 N·m) of torque. Final drive ratios include 3.42, 3.73, and 4.10.

Applications:

Note:These transmissions have issues with early style 12 pin harnesses in which transmission fluid leaks around the harness and shorts the pinouts causing transmission to go into "limp mode" This issue can be easily rectified by simply cleaning the plug.

See also[edit]