What is the best setup 8xl and warrior 9920

[RC-Monster Mike]

The diffs could easily be modified to accept regular viscous fluid if you have access to a lathe. This would be a better option IMO. Also, the Revo diffs could be used with a different bearing on one side(Revo diff cup is a little different), so a Modified Revo diff(aluminum diff cup) would probably hold up better. Both are band aids in the long run, though. 20 cells and an 8xl motor will NEEEEEED 1/8 diffs for ultimate durability.