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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 03-10-2013, 11:27 AM
mafabix mafabix is offline
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Location: Kampala
 
Join Date: Jan 2011
Posts: 70
Mein Auto: BMW 318i
Replaced diff works but with issues

After a great headache for 6 months with first humming noise and then progressing to a jarring grating or ratcheting sound emanating from the belly of my 2003 e46, the culprit was finally nailed: it was the diff! I fitted another diff (used) and now I have a great smooth ride with hardly a sound!!! But with one issue: at around 60kph, there is a sound like the car is moving through a huge wind! I cannot quite describe it but u will get the picture if u have ever experienced the sound an earthquake makes. When I reach about 80kph the sound disappears. What is the problem now? Could it be that probably the diff is not the exact fit? I cannot tell if the replaced one was the exact part number as the original? Could it be the workmanship of the mechanic in replacing the diff?
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Old 03-10-2013, 03:37 PM
GoForthFast GoForthFast is offline
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Location: New York
 
Join Date: Jul 2004
Posts: 2,443
Mein Auto: '04 330Ci 6-speed
Add another possibility; the used diff has a flaw.

Sure the center bearing is good? Driveshaft was mated properly?
Diff mounting bushing in good shape?



http://www.bimmerfest.com/forums/sho...d.php?t=681143

Last edited by GoForthFast; 03-10-2013 at 03:40 PM.
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Old 03-12-2013, 03:16 PM
mafabix mafabix is offline
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Location: Kampala
 
Join Date: Jan 2011
Posts: 70
Mein Auto: BMW 318i
Mechanic said the center bearing was fine but I am taking his word. I am going to get another opinion about the other items. Thanks
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