I am in the proscess of building a RTR Rock Rey into a racer, I have read a lot about the highs and lows on these rigs but wondering what the U4RC guys that are track racing these are putting in the front diffs for fluid weight? I do have the Exotek front diff carrier as well as the SSD front housing. back in my 1/8 scale truggy and buggy days I would run 2000 rear,10,000 center and 5000 in the front. I'm pretty sure most are running the rear locked and I think the rules say the center has to be locked anyway