After the bashing session:

[Sorb3t]

I have used 7075 GARC bulks for a couple years now. They have been great, no worries. I ran stock diffs with FLM cups for a long time then switched to UE 8 spyders when I started stripping gears (big jumps + power = stripped stock diffs). Now I never have to worry about that part of the car, just maintainance, and I was able to build in steps. I have read the FLM hybrids w/ 1/8th scale are rock solid also. Both setups $$$ but you will not have to worry about them again. I guess all the diff talk is becuase what bulks you buy affects what diffs you can run now or later.