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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 10-19-2015, 03:28 PM
iffy iffy is offline
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Mein Auto: 325i e46
rear end thudding

Please help with an issue I have. Please detail a possible part that could be weak and inadvertently put pressure on rear suspension top mounts causing them to thump and thud?
It won't be the rear trailing arm bushes, shocks or springs.
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  #2  
Old 10-19-2015, 04:45 PM
teklord69 teklord69 is offline
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Differential mount is cracked? That would cause a thunking when shifting.
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  #3  
Old 10-19-2015, 09:03 PM
SPDSKTR SPDSKTR is offline
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Mein Auto: E46 ZHP TS2+ Coupe
Blown shocks or bad rear shock mounts are my guesses.
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  #4  
Old 10-19-2015, 10:05 PM
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Diff bushing....
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  #5  
Old 10-19-2015, 11:31 PM
SPDSKTR SPDSKTR is offline
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Quote:
Originally Posted by Fast Bob View Post
Diff bushing....
He didn't say if it's when going over bumps or shifting.

If shifting, then yes... rear diff bushing. If bumps, then something suspension-related.
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  #6  
Old 10-23-2015, 03:22 PM
iffy iffy is offline
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The noise is not diff related. It suspension related. Plus mounts wouldn't make a noise if diff bushes are gone. I repeat though: the mounts are perfectly fine (their new)
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  #7  
Old 10-23-2015, 03:53 PM
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MalibuMafiaV MalibuMafiaV is offline
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Mein Auto: E60 M5 & Stage 3 Audi S4
It could be that the mounts are tight enough or the washer between the mount and rear shock wasn't put in etc
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