I've been using the losi carbide balls in my B4/B44 and they work good, smooth and last a long time. I've used ceramics in the past but they didn't work any better or worse than the carbides.
Normally for a rebuild I just replaced or flip the rings and slap some new balls in. The thrust assembly, at least on the AE cars, last a long time.
Last edited by Gliptal; 11-10-2008 at 07:24 AM.