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Old 07-26-2015, 12:09 PM   #1
WeXio
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Join Date: Jul 2015
Location: Sweden
Posts: 1
My Ride: BMW 325Ci 2001
Help me diagnose this rear differential sound

So i have this hollow sound when driving at higher speeds, and it's worse at turns. Possibly more to the right than left. I've had the rear in the air several times to diagnose it, and i've done the following:
1. Checked fluid level, ok and clear with no metal shavings (not sure if correct fluid, but it was done by previous owner and this noise wasn't present the first 4 months of owning the car). No leaks.
2. Checked both rear wheel bearings for play, none found.
3. Checked brake pads, looks ok but there is a slight rub on the disk. Brakes work fine and it brakes straight.
4. Driven next to a wall, slow and straight, with windows down. No unusual sounds.

I've had it in the air before and listened to the rear differential, but didn't hear anything funny. Now, i did it again and now i heard a clunking noise, like when the gears are engaging. When i rotate just one wheel, the other one doesn't rotate. When I rotate them in the same direction it seems to lessen the noise is less frequent. When I rotate them in opposite directions, the noise is more frequent. I can also rock one wheel back and forth and it will clunk both ways.

I've recorded it on a video. The loudest noise is the disks, but you can definitely hear the clunk-clunk-clunk.

I've booked a time at the local BMW workshop, but since it's another 3 weeks, I'd like to fix it my self if possible._a_
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