I'll be using the truck for mainly DD, and occasionally at the track. I'm hoping the stock axles will support the 1k hp mark, I think I'm going to go with the grizzly locker to replace the g80 though.
the stock rear end will be just fine. jsut know that the grizzly locker will click around corners and acceleration around a corner will make it lock in, making tire wear increase over an open/limited slip/g80/air locker rear diff.