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Old 12-08-2015, 12:06 PM   #1
Knight
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Rear Clunking Noise - What Next?

I've been experiencing a rear rumbling/clunking noise in my 325i. Silent on perfectly smooth roads but present at any road imperfection. The following has be replaced so far:

-Springs (OE BMW)
-Shocks (Bilstein B4, Meyle HD RSM's, Z3 reinforcement plates)
-RTAB's (Lemforder w/ FCP Limiters)
-Differential Bushings (OE BMW w/ new hardware)
-Differential Carrier Bushing (OE BMW w/ new hardware)
-Sway Bar Bushings (Lemforder)

I ripped everything out of the trunk. Zip tied any loose cables. Even took it to a friend's shop (former BMW master tech) and had the subframe dropped. No cracks or tears, thankfully.

This is getting very irritating. Suggestions on where to look next are appreciated.
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Last edited by Knight; 11-09-2018 at 05:05 PM.
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Old 12-08-2015, 12:31 PM   #2
franz
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Try disconnecting one of your sway bar end links and see if it goes away...
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Old 12-08-2015, 12:36 PM   #3
Knight
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Quote:
Originally Posted by franz View Post
Try disconnecting one of your sway bar end links and see if it goes away...
Forgot to add that the sway bar bushings were also replaced. End links were untouched but I'll look into that.
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Old 12-08-2015, 01:29 PM   #4
franz
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When I put on Hotchkiss front sways the brackets for the bushings bent very quickly and I chased down that clunk for about a year. Disconnecting one end link made it go away, the bushing mount needed to be replaced with a beefier one with side flanges.
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Old 12-10-2015, 02:30 PM   #5
greenpick
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I also have a 2001 325i. I had a rotational knocking sound coming from the rear. Thought is was the drive-line. After a few times in the shop with not help, I finally discovered the the axle shaft on the driver side which can float inbd-outb was stuck all the way inbd. After freeing it up and centering it, the knock went away. Not sure if this is the same type of noise you are experiencing.
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Old 12-10-2015, 05:38 PM   #6
Knight
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Quote:
Originally Posted by franz View Post
When I put on Hotchkiss front sways the brackets for the bushings bent very quickly and I chased down that clunk for about a year. Disconnecting one end link made it go away, the bushing mount needed to be replaced with a beefier one with side flanges.
New Lemforder rear end links have been ordered. It would be nice to bring this saga to an end.

Quote:
Originally Posted by greenpick View Post
I also have a 2001 325i. I had a rotational knocking sound coming from the rear. Thought is was the drive-line. After a few times in the shop with not help, I finally discovered the the axle shaft on the driver side which can float inbd-outb was stuck all the way inbd. After freeing it up and centering it, the knock went away. Not sure if this is the same type of noise you are experiencing.
New diff axle seals went in last week. Nothing was mentioned about the axle shaft being stuck but I'll look into this further if the end links don't resolve the issue. Thanks!
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Old 02-19-2016, 08:57 PM   #7
ameek95
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Find out the issue yet?

Knight I'm having the same issue every time I hit a bump in the road a clunk sound appears. It sounds like something is super loose back there!!! its super annoying!!!!!!!
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Old 02-19-2016, 10:18 PM   #8
redfeathers
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Check the rear Differential Bushing, the horizontal one, move it with a pry bar, see if it's worn out. It also has to be torqued to OVER a 100 ft/lbs or it will clunk.
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Old 02-20-2016, 02:19 PM   #9
djacs1
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Have had clunk from somewhere back that also sounds like something loose. Replaced springs and shocks and exhaust around same time it started. Have never found source. Been there almost 2 years. Had Indy look for source but never replaced stuff yet.
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Old 02-20-2016, 08:03 PM   #10
evanr614
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had the subframe dropped and didnt swap bushings?
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Old 02-21-2016, 01:50 AM   #11
ameek95
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I found my problem, It might be the same for yours. Mine was the trailing arm bushing. It was worn out and making The sound. I hope this helps!!

Here's a link to the part super cheap!!!

https://www.fcpeuro.com/products/bmw..._ogaAnF88P8HAQ
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