Thanks for the post guys. I will check out that diff link. The XXX-S will certainly hold the largest of LiPo 2s batteries. Nothing in the way vertically. Thanks for the pic. Look at all those red bits.
Paralectic-The Bfast products look good. That Losi thrust bearing has carbide balls, though. I don't know yet whether it is readily available, as the quantity available went to 0 after my order. I actually ordered 2 and received only one. It is often thought most of the roughness in a diff is located in the thrust bearing as it is undersized compared to the diff and has a very similar function and load while the diff is undergoing diff action.
Rebuilding the diff every heat was the Norm at the Gulf Coast race, for the other cars. in spite of that, many times, the rear diffs failed. I suspect they are not using enough tension and going for silky smooth. My car is setup to run well with a tighter diff needed for a 3.5 motor.
Tony-
Here is my setup for outdoor asphalt in this thread. Go with stiffer springs and add swaybars for carpet.
http://www.rctech.net/forum/6546648-post46.html
Here is a related post on
Setting Up a used XXX-S Car in this thread.
http://www.rctech.net/forum/6633407-post111.html
Additionally guys put links to team drivers setups early in the thread.