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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 | |
| Manufacturer | General Motors |
| Production | 1991–2013 |
| Body and chassis | |
| Class | 4-speed longitudinal automatic transmission |
| Chronology | |
| Predecessor | Turbo-Hydramatic 3L80 / THM400 |
| Successor | 6L90 |
Gear ratios edit
| 1 | 2 | 3 | 4 | R |
|---|---|---|---|---|
| 2.48 | 1.48 | 1.00 | 0.75 | 2.07 |
4L80-E edit
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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 edit
| 1-2 solenoid | 2-3 solenoid | |
| 1st gear | on | off |
| 2nd gear | off | off |
| 3rd gear | off | on |
| 4th gear | on | on |
No power results in 2nd gear as "limp home mode."
Applications edit
- 1991–2013 Chevrolet C/K/Chevrolet Silverado/GMC Sierra 2500 and 3500
- 1991–2013 Chevrolet/GMC Suburban/GMC Yukon 1500 and 2500
- 1991–2009 Chevrolet Van/Chevrolet Express/GMC Savana 2500 and 3500
- 2002–2006 Chevrolet Avalanche 2500
- 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 V12
- 1994–1997 Jaguar XJR
- 1993–1997 Jaguar XJ12 / Daimler Double Six
- 1996–1999 Aston Martin DB7
- 2001–2006 Chevrolet HD trucks
4L85-E edit
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:
- 2002–2006 Chevrolet Avalanche 2500
- 2001–2006 Chevrolet Suburban / GMC Yukon XL (8.1L Vortec only)
- Chevrolet Express / GMC Savana with Duramax Diesel or 8.1L Vortec
- Rally Fighter
See also edit
References edit
- ^ Adcock, Ian (1992). Bentley Continental R. London: Osprey Publishing. p. 113. ISBN 185532-260-9.
- ^ "Powertrain Control Solutions - Factory New Transmissions". Archived from the original on 2013-12-22. Retrieved December 22, 2013.
- ^ GM Powertrain. "07 Hydramatic 4L series". General Motors. Retrieved January 5, 2014.
- ^ "Supermatic 4L85-E 4 Speed Auto Transmission: 19300175 | Performance".
- ^ GM powertrain. "07 Hydramatic 4L Series Specs". General Motors. Retrieved January 5, 2014.