Help. Clunk sound from transmission when letting off gas in gear 1-2

ms372 · 09-09-2013, 10:25 AM

I hear a clunk noise from the transmission area when I let off the gas in first gear. For example, I'm driving in 1st gear while in a parking lot and the RPM is at 3k, then I let go of the gas and and RPM drops and I hear a clunk noise. This also happens in 2nd too. I also hear it when getting off from 1st gear.
Its been getting worst lately and i been hearing it more and more.

Any clues on what it might be? had a BMW mechanic hear it and couldn't tell what it was.

bigjae1976 · 09-09-2013, 02:13 PM

I would guess a driveline mount or flex disk.

Exclusivs · 09-20-2014, 11:41 PM

Any update?

pbonsalb · 09-21-2014, 06:30 AM

Front diff mount bolt?

ms372 · 09-21-2014, 08:55 AM

Quote:

Originally Posted by Exclusivs

Any update?

Quote:

Originally Posted by pbonsalb

Front diff mount bolt?

click on the pdf i attached it explains what you have to do if you have such a sound. its was something to do with the input flange but it might not be the case in all situation. The pdf file explains the service needed.

M3clicking.pdf

pbonsalb · 09-21-2014, 06:33 PM

You wouldn't by any chance have the repair procedure referenced in that PDF,
"RA 33 01 021" I would really like to see the details for reinstalling the diff input flange.

acidandroid · 09-21-2014, 08:48 PM

I have similar noise in my car (DCT)
it sounds more like a clunk, like something is getting loose
it happens when getting on and off the gas,
as OP says, RPM drops and hear the noise, same to me
so could it be clutch pressure plate dis/engaging noise?

squartus · 09-29-2014, 03:54 PM

Check your rear diff bolts as well, sometimes it can sound like the clunk is coming from further forward. Rear diff bolts getting play from the squishy mounts and snapping is a know issue so be worth looking at.

dry87 · 07-08-2016, 04:22 AM

I have this problem too, any solution? So the problem from transmission or LSD? Is this just inconvenience sound or it will broke my car?

dry87 · 07-08-2016, 04:57 AM

Is this article the answer?

09-09-2013, 10:25 AM	#1
ms372 White Shark 88 Rep 919 Posts Drives: AW E92 m3 6MT Join Date: Mar 2012 Location: Montreal iTrader: (0)	Help. Clunk sound from transmission when letting off gas in gear 1-2 I hear a clunk noise from the transmission area when I let off the gas in first gear. For example, I'm driving in 1st gear while in a parking lot and the RPM is at 3k, then I let go of the gas and and RPM drops and I hear a clunk noise. This also happens in 2nd too. I also hear it when getting off from 1st gear. Its been getting worst lately and i been hearing it more and more. Any clues on what it might be? had a BMW mechanic hear it and couldn't tell what it was. __________________ ESS \| Challenge x-pipe \| Akrapovic \| Stoptech BBK (380/355) \|Ohlins R&T \| Dinan \| Vorsteiner \| Downforce USA \| Varis Diffuser \| Gintani \| UUC \| BMW Performance \| Macht Schnell \| Forgestar F14's SDC 19x9.5F 19x11R \| 255.35 295.30
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09-09-2013, 02:13 PM	#2
bigjae1976 Major General 1579 Rep 8,077 Posts Drives: 11 E90 M3 Individual Join Date: Mar 2006 Location: Houston, TX iTrader: (22) Garage List 2004 BMW M3 [4.50] 2011 BMW E90 M3 [5.25] 2013 BMW 328i [5.00]	I would guess a driveline mount or flex disk. __________________ 2018 F30 320iX Melbourne Red 2011 E90 M3 Monte Carlo Blue 2004 E46 M3 Imola Red 2000 E36/7 Z3 Steel Blue
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09-20-2014, 11:41 PM	#3
Exclusivs Colonel 543 Rep 2,970 Posts Drives: E92 M3 Join Date: Dec 2007 Location: USA iTrader: (34)	Any update?
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09-21-2014, 06:30 AM	#4
pbonsalb Lieutenant General 5266 Rep 10,651 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	Front diff mount bolt?
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09-21-2014, 06:33 PM	#6
pbonsalb Lieutenant General 5266 Rep 10,651 Posts Drives: 18 F90 M5, 99 E36 M3 Turbo Join Date: Feb 2011 Location: New England iTrader: (4)	You wouldn't by any chance have the repair procedure referenced in that PDF, "RA 33 01 021" I would really like to see the details for reinstalling the diff input flange.
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09-21-2014, 08:48 PM	#7
acidandroid Enlisted Member 12 Rep 40 Posts Drives: E92 M3 Join Date: Jul 2014 Location: Taiwan iTrader: (0)	I have similar noise in my car (DCT) it sounds more like a clunk, like something is getting loose it happens when getting on and off the gas, as OP says, RPM drops and hear the noise, same to me so could it be clutch pressure plate dis/engaging noise?
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09-29-2014, 03:54 PM	#8
squartus Major 314 Rep 1,017 Posts Drives: 2010 E92 M3 6MT Join Date: Apr 2013 Location: Mississippi iTrader: (0) Garage List 2010 E92 BMW M3 [10.00]	Check your rear diff bolts as well, sometimes it can sound like the clunk is coming from further forward. Rear diff bolts getting play from the squishy mounts and snapping is a know issue so be worth looking at. __________________ 4.4L LC stroker/ESS VT2-625/Volk te37 sl's/AA exhaust/DSS Carbon Fiber driveshaft/ARH Headers.. etc
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07-08-2016, 04:22 AM	#9
dry87 Private First Class 41 Rep 147 Posts Drives: E92 M3 Join Date: Jul 2014 Location: DKI Jakarta iTrader: (0) Garage List 2008 BMW M3 [0.00] 2015 porsche macan [0.00] 2015 bmw 435i [0.00]	I have this problem too, any solution? So the problem from transmission or LSD? Is this just inconvenience sound or it will broke my car?
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07-08-2016, 04:57 AM	#10
dry87 Private First Class 41 Rep 147 Posts Drives: E92 M3 Join Date: Jul 2014 Location: DKI Jakarta iTrader: (0) Garage List 2008 BMW M3 [0.00] 2015 porsche macan [0.00] 2015 bmw 435i [0.00]	Is this article the answer? Attached Images
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