I have my car up on jack stands at the moment, both rear wheels are in the air. I put the car in gear so I could tighten the bolts on the half shafts but the wheels still rotated?? As far as I know I have the stock diff, shouldn't the wheels NOT spin while it's in gear? I read somewhere b4 posting here that if both wheels are in the air they will just spin in different directions? If i grab the prop shaft and spin it, it doesn't turn. IF i put the car in nuetral and spin the prop shaft it spins both wheels. Is it normal for me to be able to spin both back wheels freely while in gear? I'm getting to the point where I might part this car out and get a 325i.