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09-25-2017, 08:04 PM | #45 | |
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09-25-2017, 08:31 PM | #46 |
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I don't know. I have clunking also and it seems others do as well. But it may be that nothing is wrong and that clunking is ok for these cars. I don't think my drivetrain noises have gotten any worse in the past 7 years. I do think that changing to stiffer bushings amplified the noise a little but to me the stiffer bushings are worthwhile. I would not rush out to rebuild a diff unless I was experiencing a performance problem.
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09-26-2017, 02:30 PM | #47 | |
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But I don't need to feel the kick to my ass when I open a throttle on high speed... this is most what I am worried. Even if it is normal... That is bad. I drove the same car of my friend and nothing kicks there... but my car kicks me... And I in a fury!! |
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09-26-2017, 09:36 PM | #48 | |
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Thanks! No more differential questions for me at this time. |
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06-11-2020, 01:50 PM | #50 |
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When I bought my 08 m3 with 65K miles I didn't notice any clunking noise from the rear diff but after i upgraded to solid rear sub bushings and replacing all my arms with spl(spherical joint) I have noticed the same type of clunking noise from the diff area when accelerating from a stop. Since everything in the rear suspension are solid except for the diff bushings I can only assume that all the load is transferring to the diff bushings causing it to make that noise. I haven't check if my diff bushings have gone bad yet but I do plan on upgrading them to poly and when I do I will keep you guys updated whether or not that fixed the clunking issue.
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06-11-2020, 06:57 PM | #51 |
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Spencer Burke recently came out with a well documented video with some good info. Based on the video, it's the center support bearing/driveshaft hitting the heat shield because the bearing is failing, causing the driveshaft to sag and hit the metal heat shield below (or close enough to this, still the basis of causing noise).
In my personal experience, this started happening a couple weeks ago (70k miles, E90). I started noticing a higher pitch 'clink' when taking off in 1st gear (happens when car is cold or fully warm), only from a stop to low speeds and goes away after the immediate sound occurs. The best I can describe the sound is like an empty glass bottle rolling around under my seat and hitting the metal seat rails (clink-ing sound). The sound seems like it's coming from where the center support bearing is.
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Current: 2009 Alpine White/Black e90 m3
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