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11-22-2011, 03:03 PM | #1 |
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differential/subframe clunk when slowing down
I have had the recent pleasure of having my differential or subframe (that is the sound its coming from) start clunking at slow speeds when stopping or just stabbing the gas. Basically any change in torque forward or backward. I read about a ton of different bmws and 3 series of past having this and there is a mention of a service bulletin but nowhere to be found. Anyone know the bulletin or specific cause of this for this model?
On last model they replaced the flange on the drive shaft but that was for a 46. I checked my diff bolts and while 1 was loose, it did not fix the problem after tightening. Otherwise car performs perfectly and no problems or sounds at speed. Never launched, never had wheel hop and barely do any 1st gear pulls, so bulk of my "hard driving" are second gear pulls so I do not think too aggressive of a force has caused any of this. I could care less about the sound but it soundsl ike something is actually loose when clunking around. Its not a transmission "slam" either. |
11-22-2011, 03:28 PM | #2 |
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I thought the differential on the E9X was far superior to the E46 based on your comments in the other thread?
In all seriousness, I wouldn't diagnose this on the internet. My two M3s have had no similar issue so something must be up with your car. Sounds like a trip to the dealer.
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11-22-2011, 03:52 PM | #3 | |
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Set up dealer appointment-clunking is never a good thing |
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11-22-2011, 03:53 PM | #4 | |
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11-22-2011, 03:55 PM | #5 | |
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Last edited by -=Hot|Ice=-; 11-22-2011 at 04:23 PM.. |
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11-22-2011, 04:00 PM | #6 |
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If true, that is impressive... even the Black Series only locks to something like 60% I believe.
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11-22-2011, 05:58 PM | #7 |
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OP have a 6MT or DCT?
.
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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11-22-2011, 06:07 PM | #8 |
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11-22-2011, 06:07 PM | #9 | |
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Absolutely take it in to get it checked out. |
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11-22-2011, 06:53 PM | #11 |
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oh yes-anyone have the SIB for the diff fluid change regarding noisy diff? I know they add an additive but you know dealers, they will be clueles unless spelled out for them!
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11-22-2011, 09:29 PM | #12 |
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6MT or DCT?
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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11-22-2011, 11:50 PM | #13 |
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Attached...
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2015 BMW M5 Sedan Returned to BMW at end of lease.
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