RE: Killed rear diff on my maxx?
if you broke one stock one, you'll break another.
I would suggest getting an aluminum diff cup with ring gear that has 3mm screws instead of the stock 2mm, Kimborough used to make one that was fairly cheap (like $20 for the cup and $10 for the ring gear) but that apparently isn't around anymore... I did a quick googlel search and found other options for around $45...