Great thread. It seems the faster you go the faster the diff goes.
Heavier grease in the thrust bearing. Has really helped my Xray.
As for the diff rings I tried heavier grease and it helped the rear diff but I'm still 2 difffs to 1 On the front diff. Running 4300 foam on carpet. Andrew has probably the best solution and that would be dial out the at the bottom end. most factory mod set ups on speed controls are allready that way I think.
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