Folks,

Been helping my brother in law with his W123 and it has an issue I have a few questions about. The car runs great, but when it is in 2nd gear, if you are accelerating hard, or climbing a hill, there is a thumping type vibration coming from the back end. If you back off the power it goes away. Almost feels like something is slipping, but the engine does not start revving and the car keeps accelerating normally. So far we have replaced the rear shocks, rear sway bar links and mounts, transmission mount, differential mount, both flex disks, and driveshaft center carrier bearing. The exhaust donuts and hangers look fine. The only thing I can possibly think of is the rear axles. The boots on them are fine and they are not torn or have grease leaking from them.

Any suggestions?

Glenn

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)