Ratios available compared to stock 3-speed

 

 Output for one turn of input

Gearbox:   3-Speed   4-Speed Hi 4-Speed Lo
First 0.405 0.507 0.436
Second 0.711 0.743 0.689
Third 1.000 1.000 1.000
Overdrive   1.355 1.166

 

 Input for one turn of output

Gearbox:   3-Speed   4-Speed Hi 4-Speed Lo
First 2.469 1.972 2.291
Second 1.406 1.346 1.452
Third 1.000 1.000 1.000
Overdrive   0.738 0.858