Knocking sound inside differential

[911monty]

Originally Posted by heiwaz

So, if the problem came from part number 5 can be repaired, but if it came from part number 2 can't be repaired, and need to replace the pinion and ring gear?

Part #2 can be replaced but will require complete transaxle teardown to properly set the gear lash and contact. Don't know how readily you can find a used trans in Spain, but to replace ring and pinion along with a rebuild, a used trans may be better option. I'm hoping for your sake it is something in the carrier or the open diff that could be a DIY. Pulling the cover will give you a good idea of what comes next. To help with long range diagnosis, how do you drive this car, Smoky burnouts much?