Hello Diesel Diehard
another moniker similar to mine, yikes! I hope we don't get confused with each other's posts
I am sure that something is wrong that is allowing the disc to fail prematurely, the driveshaft might be involved. Also the carrier bearing and support (if there is one) may be worn, if you would feel a wobbling or hear something I'd suspect that. I had that problem on an old W115 car (not the one I own presently), it made a noise that I can only describe as a boogity-boogity during acceleration, more so in low gear and 2nd gear BTW.
The front flex disc fails more often then the rear one, I attribute this to it being flexed more when the engine moves. If the motor mounts are bad, and maybe the engine shocks are a factor in this also, then the flex disc will see more flexing.
Dieseldiehard (the Oldriginal DDH!)
1971 220 (gas) 4-spd manual 106441
1979 300TD w/ ’85 turbo engine 295530
1983 300D 243280
1985 300TD 217300
1987 300D 258230