what other cars can i swap transmissions with out of my 1990 audi v8?

If your car looks like this, the 1990 Audi V8 Quattro Sedan it came with the 4HP 24A 4 speed automatic and will swap with .. 1990–1991 Audi V8 3.6 V8 quattro 1992–1994 Audi V8 4.2 V8 1994–1996 Audi D2 A8 4.2 V8 quattro 1995–1997 Audi S6 4.2 V8 C4 100

But if that is all that's wrong can you not put in a new seal on yours? Yes, I understand it's a lot of work, $600 or more labor and a $5 part, and I also understand that replacing the main seal means taking the transmission apart and might as well rebuild it if it has high mileage