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Old 10-16-2008, 07:33 PM
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ja17 ja17 is offline
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Join Date: Aug 2004
Location: Blacklick, Ohio
Posts: 238
Hello,

My first guess is the rubber in center driveshaft support has gone bad. This condition will cause a knocking/thumping sound under acelleration. The sound originates from between the front seats under the car.

Normally the driveshaft is removed, the rubber carrier and bearing are changed. All the flex discs should be checked at this time. Some models have two driveshaft supports and a three piece driveshaft! You'll have twice the cost in parts if this is the case since you should replace both. Always mark the drive shaft parts so they assemble exactly to prevent any balance and vibration problems.
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Joe Alexander
Blacklick, Ohio
1964 220SE Rally (La Carrera Panamericana someday)
1966 Unimog 404s (Swedish Army)
1969 300SEL 6.3 (sold)
1969 280SL Pagoda
1973 280SEL 4.5
1974 450SLC FIA Rally car (standard trans)
1982 300D turbo (winter driver)
1986 560SEC
1989 Unimog FLU419 (US Army)
1991 300TE (wife)
2002 SLK 32 AMG (350 hp)
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