Bummer, but glad ya got it solved! I wonder if anyone has found a HPI or Traxxas diff (or other brand) that'll fit in the Redcat diff housing??? Although I remember seeing some "upgraded" diffs when looking at parts for some of my redcats, so maybe they sell a heavy duty set for your car?? Iv'e still not pulled mine apart to see what's up.. Rear wheels spin awefully freely though, and dont feel connected to each other at all.. Ruh Roh..