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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 05-19-2016, 10:58 PM   #1
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M3 e46 clunk in the rear

Okay, so lately I started to hear a clunk type of sound coming from underneath the car whenever I let off the gas while already accelerated at random speeds. At first it was quieter but not you can not only hear it louder but also feel it. The sound is often 2 clunks right after another and also does it when shifting gears(SMG btw).

I'm no car expert but I do know some stuff, therefore with my knowledge about cars I am worried about couple things! First would be a bad flex disc, second would be bad differential bushings or mounts??????
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Old 05-19-2016, 11:08 PM   #2
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M3 rears clunk. Then again - M3 subframe mounts crack.

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Old 05-20-2016, 02:00 AM   #3
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The gear shift clunk is normal. Take it out of sport mode and set the gearbox to 3 or 4 and see if you get it then.

Only use sport mode when driving a bit harder than normal and changing gears over 4,000rpm... M3's love that
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Old 05-20-2016, 09:10 AM   #4
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Next time you have the car up on the lift just have the rear suspension checked out (differential and subframe bushings, shock mounts, etc) and also the driveshaft, guibo/flex disc and the center support bearing
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Old 05-20-2016, 08:58 PM   #5
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I have been living with this clunk! Brand new diff bushings, subframe bushings, rtabs, welded subframe reinforcement. Still have it! Yours seems like its a little different than mine. But good luck, i know how annoying it is. Have new suspension going in soon, we'll see if its better or not.
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Old 05-21-2016, 09:25 AM   #6
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Mine did yes same thing, ended up being shocks
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Old 05-24-2016, 05:04 PM   #7
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the shock mounts go bad as well....that is a serious clonk
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Old 05-24-2016, 08:36 PM   #8
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Check the suspension and bushings, but these cars simply clunk. There's a lot of lash in the LSD. More on one side than the other. It's the way it was designed.
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clunk noise, differential, differential bushings, flex disc, knock

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