auto.wikisort.org - Automobile

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.

This article needs additional citations for verification. (January 2014)

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

1	2	3	4	R
2.48	1.48	1.00	0.75	2.07

4L80-E

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 max GVWR of 18,000 (Axle and vehicle dependent)[3]

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

	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

• 1991–2013 Chevrolet C/K/Chevrolet Silverado/GMC Sierra 2500 & 3500
• 1991–2013 Chevrolet/GMC Suburban/GMC Yukon 1500,2500 & 3500
• 1991–2009 Chevrolet Van/Chevrolet Express/GMC Savana 2500 & 3500
• 2002–2006 Chevrolet Avalanche 2500 General Motors LS engine only
• 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

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:

• Chevrolet Avalanche 8.1 Vortec only.
• Chevrolet Suburban 8.1 Vortec only.
• GMC Yukon XL 8.1 Vortec only.
• Chevrolet Express with Duramax Diesel or 8.1 Vortec 2500 & 3500 only.
• GMC Savana with Duramax Diesel or 8.1 Vortec only.
• Rally Fighter

See also

• List of GM transmissions

References

---