Hello dear community, in my 1993 Audi 80 B4 Avant Quattro NG there is a problem. I started today with locked differential, normal up to the third gear. In the third there was a cracking noise and no longer drives. Directly afterwards it was parked. The engine was running, GAng was inside, gas was assumed but he did not go forward. If I want to go no without locked differential, I lock it but he drives in the first and in the second gear… Can someone please help me What could that be? Greetings