Well I did some checking and found that the steel diffs from the TC3 will work in this car but there is alot of replacement that needs to be done. essentially the entire diff must be replaced. rings, bearings, etc. is there an aluminum or steel direct replacement for the plastic outdrives? from what I have seen its gonna cost me 80 bucks to change over to the steel diffs...the regular steel and lightened steel from associated are bigger in diameter and require different parts to do the change over.