Diff question... (lots of info provided)
92 325is 245K KM
Noticed a humming from the rear lately so I lifted the rear end, turned on the car, popped it into 4th and went to the back to listen.
The sound was coming from the dif for sure. There is oil in the dif, almost as full as it gets; it does seem a bit thin.
If the car is in neutral and I spin one wheel, the other wheel spins in the SAME direction.
If the car is in gear and I spin one wheel, the other wheel will spin in the other direction BUT there is A LOT of resistance; I can barely do it!
Tomorrow I will put in Royal Purple gear oil, but I doubt that will fix anything.
Whats my next course of action?
'92 325is 5sp