I did search and didn't really find what I was looking for.
I want to know what other VW and Audi rear differentials are interchangeable with my Quantum Syncro Wagons. I would imagine the turbo Audi 5000 would have a larger/stronger rear diff than my QSW and be relatively interchangeable but that is just a guess and I was hoping someone could confirm this. Even better would be if I could swap in a rear diff from any modern Audi or 4motion.
The gear ratio does not have to match the transaxle in my QSW.