Changing differential gear ration by using different pinion.

[George16]

It depends on what you want to accomplish. With 43/13 (mostly buggy diffs), you can use bigger pinion and/or smaller spur to achieve higher speeds.

[magman]

Originally Posted by George16

It depends on what you want to accomplish. With 43/13 (mostly buggy diffs), you can use bigger pinion and/or smaller spur to achieve higher speeds.

I see now, makes sense..thanks!