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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 09-29-2006, 12:31 PM   #1
UK Beemer
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Rear End knocking

Any ideas?

I have a knocking noise coming from the rear. NOTHING is visibly wrong/damaged underneath the car (verified by 3 mechanics, inc Dealership)

So it is none of the usual suspects, sway bar, sub frame etc...and the shocks are 100% new so no mount issues.

The noise has nothing to do with bumps etc but it does seem to be related to body flex, like turning up a banked driveway etc.

The noise is coming from the differential area, under the rear end, no doubt about that.

Any recommendations as I don't wanna randomly go pulling off control arms and bushings if I can help it????


Anyone else has this problem??
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Old 09-29-2006, 01:02 PM   #2
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wow same problem... they didnt find anything broken. do you get it when your taking turns and it will clunk in reverse sometime's?
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Old 09-29-2006, 01:13 PM   #3
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yeah very slow speed turning and going up and down banks - it doesn't seem to be related to the actualy turning mechanism, but more the flex of the chassis/axle when turning ya know?

I took a ride IN the trunk to listen for it and it is coming from right where the diff is, dead centre so my money is on control arm bushings or something, BUT I don't wanna open that can of worms unnecessariyl or pay another person to NOT find the problem - the noise doesn't sound bad really, more annoying than anything!!

Sometimes "shudders" if I throw it in reverse and then pull away quickly...but taht is rare... u have any ideas?
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Old 09-29-2006, 04:12 PM   #4
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its the dif. mounts, mine has same problem
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Old 10-10-2006, 09:01 AM   #5
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Yeah i had to have the same thing replaced on mine!! Its a smaal bushing pressed into the diff housing
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Old 10-10-2006, 02:12 PM   #6
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have u checked the rear sub frame?
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Old 10-10-2006, 05:07 PM   #7
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I would check out the bottom rear spring seats, those springs are notorious for breaking. Usually it is the bottom coil which breaks, and it is easy to miss because it is not quite in plain view, you kind of have to reach into where the spring is seated to actually feel and see the broken coil. have a look and tell us what you find!
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Old 10-10-2006, 07:46 PM   #8
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Old 10-10-2006, 08:05 PM   #9
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no on is sittin in my back seats lol

Quote:
Originally Posted by EuroBim View Post
I would check out the bottom rear spring seats, those springs are notorious for breaking. Usually it is the bottom coil which breaks, and it is easy to miss because it is not quite in plain view, you kind of have to reach into where the spring is seated to actually feel and see the broken coil. have a look and tell us what you find!
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Old 10-15-2006, 10:18 AM   #10
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I had the same problem! I was getting a bumping noise on the right rear when I was turning and going up the driveway. I took it to the dealer and they replaced the rear stabilizer bushings and R/S Braket and front control arm bushings. So far it's OK.
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Old 10-15-2006, 10:28 PM   #11
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Wow! This is the same problem I'm having with my 2000 323i. Except mine happens on a straight go on flat land. It's definitely coming from the diff area, dead center sound. The sound is like a metalic grind/shudder and ends like a shriek. I tried recording the sound, but it doesn't come out. Hopefully I can repro with the mechanic in the car tomorrow morning.

Another issue I'm having is that it's very hard to put the car into gear when it's cold. Changed clutch, tranny fluid and clutch fluid. But once the car warms up on the freeway, it's ok. Driving around town where the engine heats up but the tranny doesn't heat up as much doesn't do any good, it has to be higher speeds for a while to get it to shift smooth. Any suggestions? Someone suggested tranny mounts or engine mounts, could this be it?
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Old 01-08-2007, 02:01 AM   #12
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I have the same problem. I lowered my car with aftermarket sport spring and then started to hear clunking noises when going in and out my driveway or turning onto an uneven road. My problem was with the rear sway bar end link. Oddly enough, it broke apart and the clunking noise was when it hits the lower control arm. I have fixed it and the clunking noise has gone away.

But now I have a new problem..:-( I am starting hear grinding noise from my rear inner fender well. Here is a similar pic of what it looks like. I can't seem to figure out what is wrong. Can anyone shed some light on this? Thanks guys!


http://www.cashmo.org/bmw/left_rear_rub_marks1.jpg
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Old 01-08-2007, 06:51 PM   #13
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your rims to big?
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Old 01-09-2007, 03:01 AM   #14
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omg finally someone having the same problem im having. Everyone that i spoke too said my subframe could be torn. I got it checked out by acouple people and they all said it looked good. I even tried moving the diff to see if maybe it was loose or a bolt snapprd or something and their was nothing. When i am in reverse backing up a hill and i slam on the gas it knocks. Then it won't do it again. When i am turning on to something that is on an invline and i step on the gas pedal hard it does the same noise. I was thinking that maybe it was just due to my springs but i don't know
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Old 01-09-2007, 07:41 AM   #15
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Sound like the diff bushings are soft we have seen this cause mysterious clunks on a lot of e36/e46/e39 cars.
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Old 01-09-2007, 10:08 PM   #16
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mainly only the rear bushing on the diff. goes out, the bigger one by itself, the other 2 toward the front dont go bad usually...
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Old 01-10-2007, 01:52 PM   #17
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This doesnt sound like a diy??? what would you expect an indy to charge to replace the rear bushing?
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Old 01-10-2007, 10:33 PM   #18
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lol its not a DIY it is the mount on the sub-frame of your car and you cant take it off like you would any other bushing, so most likely unless you have that hand tool that garages do that costs ALOT to remove them while on the car...then you will have to get it done for you, I am going to ask my shop tomarrow and ill tell you what they estimate!
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Old 01-10-2007, 10:46 PM   #19
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The bushing is cheap but the labour is the quite expensive due to all the work involve with the diff, my labour cost was 400 bucks and this was from an Indy Bimmer shop.
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Old 01-21-2007, 06:22 PM   #20
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differential bushings.
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