Similar in design to the 4L60-E
Electronically controlled four-speed overdrive transmission
Gear ratios: 1st: 3.06, 2nd: 1.62, 3rd: 1.00, 4th: 0.70
Add up to 430 lb.-ft. torque
Direct bolt-on for Gen I Small-Block and all Big-Blocks
Improved valve body for firmer shifts
Gear ratios: 1st: 2.48, 2nd: 1.48, 3rd: 1.00, 4th: 0.75
Add up to 685 lb.-ft. torque
Four gearsets for greater efficiency
Five clutches – two brake clutches and three rotating clutches
World-class upshift speeds
Friction-reducing features include synthetic fluid use