Originally Posted by Keven H

There is certain track a gear diff feels good ! to me on tight and technical track the car gets in the turn better with a gear diff but on bigger track sweeping corner I like the spool better. Lately I have been going back and forth with both. The best thing to do is to use putty in the diff because it is the stiffest. If you want to use oil you want to use 500 000 ! but then when it warms up it gets thinner and chan ges througout the run.