All the lube was gone from mine. when it was pushed up and down, it would creak. I agree, though, that the action over rough ground/railroad tracks/etc. is clunking rather than creaking.

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mjk

'84 300SD 119KMi (Liesl der Diesel)
'84 300D 326KMi when the oil left (former parts car)
'82 300SD 253KMi (new parts car)