Overdrive pulleys help?
 

This may sound silly, but what's the difference between the normal Cat SX2 diff and the overdrive diff/pulley? Pros and cons? How it works? Things like that thanks:)

Any help would be appreciated:)

it is ment for the front and makes the front wheels spin faster than the rear. It loosens the rear a bit allowing to make faster turns. I use it on smaller tracks that have alot s turns.

Thanks:)