The 4L80-E (and similar 4L85-E) was a series of automatic transmissions from General Motors. Designed for longitudinal engine configurations, the series included 4 forward gears. It was an evolution of the Turbo-Hydramatic 400, first produced in October, 1963. 4L80-Es were optioned only in Chevrolet/GMC pickups, vans, and commercial vehicles, and the Hummer H1. It was also adopted by Rolls Royce in 1991 and modified, after extensive testing, and used initially in the Bentley Continental R, and subsequently other Rolls Royce and Bentley vehicles.
The 4L80 and 4L85 were built at Willow Run Transmission in Ypsilanti, Michigan.
Gear ratios:
Video GM 4L80-E transmission
4L80-E
The 4L80-E (RPO MT1) is able to handle engines with up to 440 ft·lbf (597 N·m) of torque.
The 4L80-E was rated to max GVWR of 18,000 (Axle and vehicle dependent)
The 4L80-E uses 2 shift solenoids, initially called Shift Solenoid A & Shift Solenoid B, later changed to comply with OBD II (On Board Diagnostics revision 2) regulations to 1-2 Shift Solenoid & 2-3 Shift solenoid. By activating and deactivating the solenoids in a predetermined pattern by the PCM, 4 distinct gear ratios can be achieved. The shift solenoid pattern, also sometimes referred to as solenoid firing order, is as follows;
Shift Solenoid Pattern
Applications
- 1991-2013 Chevrolet C/K/Chevrolet Silverado/GMC Sierra V8
- 1991-2013 Chevrolet/GMC Suburban/GMC Yukon
- 1995-2003 Chevrolet Tahoe/GMC Yukon
- 1991-2002 Chevrolet Van/Chevrolet Express/GMC Savana
- 2002-2006 Chevrolet Avalanche V8 8.1L
- 1992-2006 Hummer H1
- 1992-1998 Rolls-Royce Silver Spirit/Spur II, III, IV
- 1991-1992 Bentley Eight
- 1991-1997 Bentley Turbo R
- 1991-2002 Bentley Continental R/S/T
- 1999-2006 Bentley Arnage Red Label / Bentley Arnage R/RL/T
- 1993-1996 Jaguar XJS
- 1994-1997 Jaguar XJR
- 1993-1997 Jaguar XJ12 / Daimler Double Six
- 1996-1999 Aston Martin DB7
- 2000- 2006 Chevrolet HD Trucks
Maps GM 4L80-E transmission
4L85-E
The 4L85-E (RPO MN8) is able to handle vehicles with up to 460 ft·lbf (624 N·m) of torque.
The 4L85E is able to handle vehicles with a GVWR of up to 18,000 lbs (dependent on axle ratio and vehicle)
Applications:
- Chevrolet Avalanche
- Chevrolet Suburban
- GMC Yukon XL
- Chevrolet Express with Duramax Diesel
- GMC Savana with Duramax Diesel
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
- List of GM transmissions
References
Source of the article : Wikipedia
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