4200s shread gears

[BrianG]

I think the majority of the problem with stock diffs is really the plastic cup and the fact they only run two spider gears. Under extreme force, the cup elongates causing the gears to skip, which ruins them. If you don't want to spend lots of $$$ for the good stuff, I'd at least get an aluminum diff cup and just use stock gears. They hold up ok under decent power as long as the mesh is kept consistent.