I guess I have been lucky, since I've never taken the diffs apart on my Revo. Perhaps the center diff + slipper clutch helps? :) That's on 5s2p A123, Feigao 7XL, Mamba Max ESC.
SH Z-Car, Custom Crawler, 8s Savage, 12s XTM XLB 1/7 buggy, 4wd 4-link rear/IFS Pro4 truck, Custom Hyper 10 Short Course, Belt-Drive Mammoth ST 1/8 truggy, 4s 17.5 MM Pro HPI Blitz