rear end problems

so i started to hear some noise coming from my rear end after a u turn so when i got home i checked it and the oil was fried and there was a big chunk of some thing i could feel throw the drain plug when i draind it. WTF how easy do thies rear ends go out? and can i pull one out of a gsx or tsi. or i guess what are my optionsto get it replaced?

 

[Armitage]

I had one of the spider gears in my 4-bolt break off a tooth before. It was a pretty sizeable chunk of metal that came out with the oil. Diff worked fine for many many miles in that condition though. I have that diff completely apart so if it turns out you need any parts to repair yours with, LMK.

 

well it is my daily so i cant have it apart for long. i am wondering if any 4 bolt will fit it or what is the deal. but if i have to just go pick up one at a junk yard just to get one in the car. then i can take the time to rebuild my or another one.

 

[steve]

Well, is it a 4-bolt rear in there now, or a stocker? If its a stocker do you just want to replace it, or upgrade to a 4-bolt?