| Farrel Heavy Duty Unidrive #11 Banbury Reducer, 24:1 ratio |
| Lufkin T720DHH, 13.7:1 ratio, 1312 HP at 800 RPM input |
| Farrel #3D/F80 Unidrive reducer, 11.26:1 ratio |
| Farrel #3D/F80 Unidrive reducer, 11.65:1 ratio, 400 HP |
| Parkersburg D640, 29.01:1 ratio, 250 HP |
| Hansen roller bearing reducer, 25.9:1 ratio |
| Hansen roller bearing reducer, 23:1 ratio |