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 includes 4 forward gears. It is an evolution of the Turbo-Hydramatic 400 first produced in October 1963. 4L80-Es have been optioned only in Chevrolet/GMC pickups vans and commercial vehicles and the Hummer H1.The 4L80 and 4L85 are built at Willow Run Transmission in Ypsilanti Michigan.Gear ratios: