Lately I’ve been having an issue with my 1995 C280, 196K. On cold starts I get a rumbling sound and slight vibration near the transmission tunnel at idle and while driving. After about four miles or so it goes away. Transmission fluid looks good at the dipstick.
The guys at SWFL Mercedes-Benz Enthusiasts Club think it might be a loose torque converter bolt. Anyone every have anything similar to this? And any tips on diagnosis/repair?
Thanks. Jay.

How does the trasnsmission mount look?

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Jim

+1 on the transmission mount question. We put over 50,000 miles on the C280 with intermittent mystery internal transmission noises before an indy who was looking for the cause of a big noise (soundproofing hanging down on flex coupling) casually diagnosed the mount as "collapsed". It looked fine to me, but I replaced it (fairly easy to do) and the mystery noises were gone. I needed to have an indy tear the soundproofing out, which involved removing the coupling to get the shaft out of the way.

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1996 C280 289K Traded
1997 E420 167K Traded
2001 S430 240K Traded
2010 E550 4matic 80K
2000 GMC Jimmy 198K Gone to Boneyard
2003 Camry LE 196K
2011 Mazda3 i Sport 31K