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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Wed, Jul-12-2017, 03:43:15 PM   #31
nowanker
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Default Re: Chasing E46 M3 never ending thud while shifting

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Originally Posted by HassanEido View Post
the THUD you hear, is in my experience, due to the fact that your RACP acts like a drum. Being hollow and thin, the shift force strikes the RACP and creates a thud. This was greatly reduced when I did an Xbrace that went down to the mountings, as the shift force now goes to the shock tours and frame rails thru the reinforcement tubes. I don't hear the thud anymore Maybe a very muted one
That's a very interesting observation! That same lack of integrity leading to RACP sheet metal failures.
Not to let BMW off the hook for the excess gear lash in some (but not all!) of their 'M Variable Locking Concept' differentials.
Inexcusable...
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Old Wed, Jul-12-2017, 04:30:09 PM   #32
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Default Re: Chasing E46 M3 never ending thud while shifting

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Originally Posted by nowanker View Post
That's a very interesting observation! That same lack of integrity leading to RACP sheet metal failures.
Not to let BMW off the hook for the excess gear lash in some (but not all!) of their 'M Variable Locking Concept' differentials.
Inexcusable...
Put down ur rear seat, remove the carpeting behind it, lower ur rear view mirror to see the trunk floor, and launch the car. Hear the thud as the floor sinks downwards like a struck drum.
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Old Wed, Jul-12-2017, 04:42:56 PM   #33
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Default Re: Chasing E46 M3 never ending thud while shifting

Suggest you re-verify you put your guibo in correctly - there is a front and back and the guibo will "wind up" when loaded (accelerating) and "un-wind" when clutch is engaged causing the driveline clunk.


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Old Sun, Jul-16-2017, 05:25:36 PM   #34
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Default Re: Chasing E46 M3 never ending thud while shifting

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Originally Posted by 01M3Fan View Post
Suggest you re-verify you put your guibo in correctly - there is a front and back and the guibo will "wind up" when loaded (accelerating) and "un-wind" when clutch is engaged causing the driveline clunk.


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It is in correctly trust me, pretty hard to put them in wrong when there's arrows pointing towards the flanges, I never understood how someone could even put them in wrong lol.

Thanks though.


I'm entertained by the drum affect. Maybe I'll fab an X-brace to secure subframe mounting points together, and also too the strut mounts. And maybe add some stereo sound dampening blanket stuff to the trunk.
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Old Sun, Jul-16-2017, 06:09:41 PM   #35
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Default Re: Chasing E46 M3 never ending thud while shifting

I didn't read the whole thread, but basically the M clunk can be caused by literally anything.

Guibo, CV joint, all the diff bushings, all the subframe bushings, and the RACP acting like a big old speaker.

I've got poly mounts in the subframe and diff, so I'm never going to be able to get rid of my clunk. I did solid mounts in my Skyline, after doing a full diff rebuild, and now the M clunk doesnt worry me because the Skyline clunks so hard and so loud I don't even notice the M anymore.
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Old Mon, Jul-17-2017, 02:14:49 AM   #36
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Default Re: Chasing E46 M3 never ending thud while shifting

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Originally Posted by Monte0704 View Post
I didn't read the whole thread, but basically the M clunk can be caused by literally anything.

Guibo, CV joint, all the diff bushings, all the subframe bushings, and the RACP acting like a big old speaker.

I've got poly mounts in the subframe and diff, so I'm never going to be able to get rid of my clunk. I did solid mounts in my Skyline, after doing a full diff rebuild, and now the M clunk doesnt worry me because the Skyline clunks so hard and so loud I don't even notice the M anymore.
Everything you've mentioned I've replaced already. Everything is brand new, all OEM bushings except diff which are poly. But I had the same sounds before and after changing everything. When I say everything I mean entire rear end (19 bushings) and flex disc/CSB along with subframe reinforcements and I am on my 2nd diff.
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Old Tue, Jul-18-2017, 01:28:45 AM   #37
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Default Re: Chasing E46 M3 never ending thud while shifting

I just drove an E46 M3 with 49k miles and the clunk/thud was terrible. Even low mileage cars have issue

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Old Tue, Jul-18-2017, 03:40:28 PM   #38
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Default Re: Chasing E46 M3 never ending thud while shifting

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I just drove an E46 M3 with 49k miles and the clunk/thud was terrible. Even low mileage cars have issue

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One of my customers traded off his BRAND NEW one because it was so bad.
Dealer would do nothing...
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Old Tue, Jul-18-2017, 03:58:57 PM   #39
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Default Re: Chasing E46 M3 never ending thud while shifting

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Originally Posted by Fhcrubarb View Post
I just drove an E46 M3 with 49k miles and the clunk/thud was terrible. Even low mileage cars have issue

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They did it from the factory. Now if there is a legitimate part to replace then replace it, but the amount of money people on this forum have blown trying to get rid of this thing is absurd.
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Old Tue, Jul-18-2017, 05:49:00 PM   #40
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Default Re: Chasing E46 M3 never ending thud while shifting

Newer M3/4s are much quieter and softer but everyone complains that the M division is selling out. Yet...massive complaints about a harmless clunk?

If you want something quiet and soft, just get a non-M.


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Discussing Chasing E46 M3 never ending thud while shifting in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)