Originally Posted by
marshallsbbq
Use the Spec-R R1 slash Xray diff that is made by Spec-R. It will also be the Ver. 2. There are about $32 from TQ RC Racing.com. That was one of the first things I bought for the car and it helped settle the car down opposed to using the spool. The diff in the R1 and S1 are the same.
If you're running 17.5 or faster on medium traction or higher, I'd strongly recommend trying the spool with DCJs. On my Schui, the DCJs with spool give the smoother cornering of the front gear diff, but without giving up accelleration out of the corners.
-Mike