1998 slk 230 very loud thumping noise...need help - Mercedes Benz SLK Forum

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#1 Old 01-03-2014
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1998 slk 230 very loud thumping noise...need help

Hello my 98 slk 180k miles auto had recently began to make moderate clunk that appeared to be coming from almost right under the shifter ...however last week the moderate clunk became a very loud noise that increases upon accelaration when going 20mph also i noticed the noise is only when on the accelarator pedal and does not make noise when rolling...i local mechanic suggested rear transmission mount but i am thinking maybe front flex disc or the center support bearing


any help will be highly appreciated thanks in advance
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#2 Old 01-03-2014
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#3 Old 01-03-2014
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Welcome from New Hampshire, i would put money on the flex disc just because they dry rot over time. Of course the only way to know is to give it a good inspection.
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#4 Old 01-03-2014
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#5 Old 01-04-2014
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This noise, is it a one time thunk when you start to accelerate, or is it a continuous thump, thump thump? The driveshaft will spin as fast as the engine in 5th (or 6th manual). is the thumping at that rate or slower? Clarify this and you'll probably get more answers.
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#6 Old 01-04-2014
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thanks for feedback....it is a continuous thump thump and increases as i accelerate past 1st gear...is there a way i can inspect the flex disc for damage while on the car or while it need to come off first?..not sure

I highly appreciate the help
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#7 Old 01-04-2014
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If you can get the car on a lift put it in nutral you can spin the drive shaft and inspect the flex disc, front & rear.
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#8 Old 01-04-2014
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thanks for feedback live free


would it work the same if put it on ramps in the driveway or is it better to limp it over to a shop with a lift?
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