My brother just shelled out for a new S-60 housing under his Drag Week 6.0 cert 70 AMX. His reasoning was that he intends to run street gears, and none are available for the big pinion 9 inch. We will see how it works out, 572 Hemi and a Bruno/Lenco. I just run the small pinion street gears in my 9", with a relatively cheap s-case.