I couldn't find any posts in the drifting section that talked about using thick grease to tighten differentials so I thought I'd start a thread. Just a little bit of backgroud, I have a TT-01 setup for drifting. It was drifting great until I started adding aluminum components which added to the weight. The rear planetary diff was too loose for the weight so it was only powering one rear wheel. The result was I could only drift clockwise. Counter-clockwise attempts only resulted in the car going straight (the front tires would do a shovel plow thing). I locked the diff by shoving pieces of foam earplugs in the diff. This resolved the issue. Shortly after, the front diff got too loose and resulted in spinning out a lot while drifting counter-clockwise. I locked the front diff in the same way and now I've got no problems drifting. In fact, the car probably drifts better now than ever before. One problem (I want my cake and eat it too), occationally I'll slap street tires on and race friends. Needless to say, with both diffs locked, my car skips around corners. A friend of mine suggested using thick automotive grease instead to get the diffs tight, but not locked. That way I could still drift and street race occationally too. I was wondering if anyone had experience with this or could suggest a thick automotive grease.