Rear Differential Noice
Hello I was hoping anyone could give me some advice. I have a 92 325is and i had a tranny service and a rear differential fluid change on my vehicle last week. the tranny new oil and new filter completely enhanced the shifting and its working amazing. THe problem is now with the rear differential. I am now hearing a clunk/rubbing noise when turning at low speed or engaging on reverse. It sound like the parking brak is engaged and you trying to move at low speeds. The mechanic top it up with new 80W90 gear oil and i think he put 1.8 q since that is what he charged me for. Any ideas on this ? is there an additive that is also require? Im kind of worry since this part can be a major repair expense.