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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-11-2006, 01:08 PM   #1
MSC1
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1999 323i Rear end/driveshaft clunking

I believe the flex disc is located under the center console It's not coming from there. It's coming from closer to the rear. I've had to replace center support bearings on E36's before but don't recall doing any on E46's

My question is, Is it common for center support bearings on 99 E46 with 120k?
Or is it common for the rear end to be bad?

You can feel play and some thuding sound when your in any gear and giving it pedal and letting off.

Any ideas? Center Support bearing? Bad rear end?
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Old 03-05-2008, 01:04 PM   #2
FiShDoG323i
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same problem here, have you fixed it yet? i installed new springs,shocks,struts,mounts,and rear diff mounts, seen no visible sub-frame damage, and still have the problem you describe above. any suggestions .i think it could be a driveshaft problem.
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Old 03-05-2008, 01:17 PM   #3
ixtoxi
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Drive shaft flex disc (guibo) or center support bearing.
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Old 03-05-2008, 01:18 PM   #4
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by any chance, does this sound like what u guys are experiencing? ughhh these knocks are such a nuisance
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Old 03-05-2008, 01:20 PM   #5
Brinkley
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its probably your rear differential bushing
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Old 03-06-2008, 06:17 PM   #6
FiShDoG323i
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its probably your rear differential bushing
no i changed the 3 rear diff mounts with meyle hd and 2 stock ones.
i hope this ain't the rear sub-frame going
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Old 03-06-2008, 06:19 PM   #7
Brinkley
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You got the big one in the rear? I seemed to have about the same issue as yours and it was the big rear mount. I would check it again just to be sure it isn't bad! Hope it's not your subframe man!
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Old 03-06-2008, 06:21 PM   #8
GRIDLOCK
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Time to get your ride up on a drive-on rack.
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Old 03-06-2008, 06:24 PM   #9
FiShDoG323i
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i work at a dealership so the drive on rack is no prob, the big rear mount is only 1 month old and i installed it myself so i know it is not bad
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Old 03-06-2008, 10:24 PM   #10
Brinkley
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yea check the subframe man Good luck!
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Old 03-07-2008, 06:56 AM   #11
mikeson
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it's not sub frame, mine is mint clean.
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Old 03-07-2008, 09:58 AM   #12
FiShDoG323i
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i talked with another tech at my shop he thinks that maybe the diff is getting sloppy (loose) internally and that the noise could be the gears banging together. i did notice that while driving last night if i tap the throttle while coasting around 40-60 i can make the noise happen more frequently, also when slowing to a stop when the trans shifts down into 1 st. gear i hear and feel the thud-clunk-bang-thump noise everyone talks about. i want this fixed but would like to do it myself. HELP.............................
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Old 03-07-2008, 10:20 AM   #13
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Have any of you jacked up your car and grabbed the driveshaft to see if it has side to side play? I had that noise once anytime a load was put on it in gear. I figured it was the carrier bearing so I bought one and when I went to install it I saw that the two nuts holding the center support up were loose. So I tightened them up and was good to go. I've still got a new carrier bearing I'd sell ya if thats your problem.
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Old 03-07-2008, 11:16 AM   #14
FiShDoG323i
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Have any of you jacked up your car and grabbed the driveshaft to see if it has side to side play? I had that noise once anytime a load was put on it in gear. I figured it was the carrier bearing so I bought one and when I went to install it I saw that the two nuts holding the center support up were loose. So I tightened them up and was good to go. I've still got a new carrier bearing I'd sell ya if thats your problem.
I will have to check that out, sounds possible, but how does or how did the center support come loose ? just curious thnaks.
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Old 03-07-2008, 11:48 AM   #15
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I had a shop take the tranny off and I guess they forgot to tighten those two bolts...that or they weren't torqued really tight and just vibrated loose.
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Old 03-07-2008, 12:27 PM   #16
FiShDoG323i
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I had a shop take the tranny off and I guess they forgot to tighten those two bolts...that or they weren't torqued really tight and just vibrated loose.
i will stll check it out, hopefully today since i have no cars in my service bay at the moment but that could change after lunch. i'll let you know what i find.
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Old 03-07-2008, 04:57 PM   #17
FiShDoG323i
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i will stll check it out, hopefully today since i have no cars in my service bay at the moment but that could change after lunch. i'll let you know what i find.
just checked driveshaft on lift at work with another tech. everything seems normal, center bearing, flex disc, u-joints, the only play int the drive line is what i think to be normal gear back-lash not much but a little. other tech said drive-line feels very good, so now i wonder what to do next, i have been told that a transmission reflash or firmware upgrade may fix this. is this true, has anyone heard of this or had it done? please let me know. thanks!
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Old 03-07-2008, 05:09 PM   #18
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as far as i know, the software upgrade is for autos. not sure if urs is or not.

btw, does the rear knock when ur coming to a stop?
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Old 03-07-2008, 05:28 PM   #19
FiShDoG323i
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as far as i know, the software upgrade is for autos. not sure if urs is or not.

btw, does the rear knock when ur coming to a stop?
yes it is auto and when coming to a stop it makes a clunk-thud type noise when the trans shifts down
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Old 02-16-2011, 08:35 PM   #20
BeeEmmDoubleU
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Originally Posted by FiShDoG323i View Post
yes it is auto and when coming to a stop it makes a clunk-thud type noise when the trans shifts down
bringing this thread back to life.

i feel the thump as my auto tranny downshifts ; bushings bad or DIFF is qoinq ? need help asap
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