Strife wrote
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I wonder if the disks fail from age alone or a combination of age and driveshaft imbalance/center bearing wear or failure.
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In my experience, it is age and miles that causes the failure of flex discs. MB has numerous different versions of flex discs and the "radially soft" or "push-pull" flex discs (likely what was on cangold's 124) seem to be more failure prone than the solid discs. The upside is that it's pretty easy to determine by observation when they should be replaced. Mark