GM Automatic Transmission

GM 4L80 and 4L85E

Introduced in 1991, the GM 4L80E and 4L85E are an extension of the TH400 first introduced in the mid 1960s. They are of course a 4 speed overdrive transmission that made their way into several light duty trucks.

4L80 and 4L80E and 4L85E Gear Ratios
1st = 2.48
2nd = 1.48
3rd = 1.00
4th = .75
Reverse = 2.08

4L80E/4L85E 1991-Later (bellhousing pattern - Chevrolet) Std. 2wd Overall Length 32 11/16 inches
Bellhousing Height 20 inches

HD 2wd Overall Length 31 15/16 inches
Bellhousing Height 20 inches

HD long Overall Length 33 inches
Bellhousing Height 20 inches

4 X 4 Overall Length 29 inches
Bellhousing Height 20 inches

Fluid Type: Dexron® III