The4L80-E (and similar4L85-E) is a series ofautomatic transmissions fromGeneral Motors. Designed forlongitudinal engine configurations, the series included 4 forward gears. It was the 4-speed electronically commanded evolution of the 3-speedTurbo-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 atWillow Run Transmission inYpsilanti, Michigan.

The4L80-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 maximumGVWR 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 withOBD-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:

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

• 1991–2007Chevrolet C/K/Chevrolet Silverado/GMC Sierra 2500 and 3500
• 1991–2007Chevrolet/GMC Suburban/GMC Yukon XL 1500 and 2500
• 1991–2009Chevrolet Van/Chevrolet Express/GMC Savana 2500 and 3500
• 1995–1999Chevrolet Tahoe/GMC Yukon 6.5L Diesel
• 2002–2006Chevrolet Avalanche 2500
• 1992–2006Hummer H1
• 1992–1998Rolls-Royce Silver Spirit/Spur II, III, IV
• 1991–1992Bentley Eight
• 1991–1997Bentley Turbo R
• 1991–2002Bentley Continental R/S/T
• 1999–2006Bentley Arnage Red Label /Bentley Arnage R/RL/T
• 1993–1996Jaguar XJS V12
• 1994–1997Jaguar XJR
• 1993–1997Jaguar XJ12 / Daimler Double Six
• 1996–1999Aston Martin DB7

The4L85-E (RPO MN8) is rated to handle engines 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:

• 2002–2006Chevrolet Avalanche 2500
• 2001–2006Chevrolet Suburban / GMC Yukon XL (8.1L Vortec only)
• Chevrolet Express / GMC Savana withDuramax Diesel or 8.1L Vortec
• Rally Fighter

• List of GM transmissions