GM 4L80-E transmission

The 4L80-E (and similar 4L85-E) is a series of automatic transmissions from General Motors. Designed for longitudinal engine configurations, the series included 4 forward gears. It was the 4-speed electronically commanded evolution of the 3-speed 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,[1] 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.

4L80-E/4L85-E
Overview
ManufacturerGeneral Motors
Production1991–2013
Body and chassis
Class4-speed longitudinal automatic transmission
Chronology
PredecessorTurbo-Hydramatic 3L80 / THM400
Successor6L90

Gear ratios
1 2 3 4 R
2.48 1.48 1.00 0.75 2.07

4L80-E
A Hydra-Matic 4L80 transmission at the Ypsilanti Automotive Heritage Museum

The 4L80-E (RPO MT1) is rated to handle engines with up to 440 ft·lbf (597 N·m) of torque.[2] The 4L80-E is rated to a maximum GVWR of 18,000 lb, depending on the axle and vehicle.[3]

The 4L80-E uses two shift solenoids, initially called Shift Solenoid A and Shift Solenoid B; they were later changed to comply with OBD-II regulations to 1-2 shift solenoid and 2-3 shift solenoid. By activating and deactivating the solenoids in a predetermined pattern by the PCM, four distinct gear ratios can be achieved. The shift solenoid pattern, also sometimes referred to as solenoid firing order, is as follows:

Shift solenoid pattern
1-2 solenoid2-3 solenoid
1st gearonoff
2nd gearoffoff
3rd gearoffon
4th gearonon

No power results in 2nd gear as "limp home mode."

Applications

4L85-E

The 4L85-E (RPO MN8) is rated to handle vehicles with up to 690  ft·lbf (935 N·m) of torque.[4] The 4L85E is rated to handle vehicles with a GVWR of up to 18,000 lbs (dependent on axle ratio and vehicle)[5]

Applications:

See also

References
  1. Adcock, Ian (1992). Bentley Continental R. London: Osprey Publishing. p. 113. ISBN 185532-260-9.
  2. "Powertrain Control Solutions - Factory New Transmissions". Archived from the original on 2013-12-22. Retrieved December 22, 2013.
  3. GM Powertrain. "07 Hydramatic 4L series". General Motors. Retrieved January 5, 2014.
  4. "Supermatic 4L85-E 4 Speed Auto Transmission: 19300175 | Performance".
  5. GM powertrain. "07 Hydramatic 4L Series Specs". General Motors. Retrieved January 5, 2014.
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