Ball Diff Help

[Cremegg]

Hi

I was wondering if anyone could help on the following

I put a new ball diff in before I went to southport last week and ran my car, 4 round in my car was getting no drive

Took the diff out and found the one of the thrust washers had completely eroded down and broke into little bits.

Was this because the diff was too tight? I can't find out why?

I've built the diff from a few videos I'd seen using the correct materials and grease

Any help would be grateful

Many thanks