Heres the ratios of the MTX boxes if this helps, i know someone with one in his garage, have a feeling it is set C as it came from a td | Gear Set A (RS) | Gear Set B (D) | Gear Set C (D) First gear ratio | 3,23 | 3,42 | 3,67 Second gear ratio | 2,13 | 2,14 | 2,14 Third gear ratio | 1,48 | 1,45 | 1,45 Fourth gear ratio | 1,11 | 1,03 | 1,03 Fifth gear ratio | 0,85 | 0,77 | 0,77 Reverse gear ratio | 3,46 | 3,46 | 3,46 Differential Ratio | 3,84 | 3,56 | 3,56 Hope this helps, obviously choice of box depends on what you want to do with it!!