Originally Quoted By: koabich
What exactly are you replacing when you rebuild a diff? All that is usually necessary are the diff balls and the diff rings. The diff rings are about $2-$3 for two of them...not expensive at all. You can use any 3mm diff ball. I used to use the Schumacher ones because they were cheaper and enough balls come in one package 2 do two diffs. I have since switched to the Acer Ceramics ($12.00 on their website for one diff). I ran them in my TC3 for over 2 years and never had to replace one.

That's all that really needs replacing. If you are constantly changing the thrust bearing out, you are not lubricating it enough or using the correct lube. I have yet to change the one in my car. If you need to change them, you can find thrust bearings all over ebay for like $5-$10 for two.

As far as the diff screws you can only use the Tamiya from what I found. Their diff requires the use of screws much longer than anyone else I have looked into.

All that is left if the spring. Again, these are not expensive and can be found for several dollars for 2. These again do not need constant changing.