I have often wondered about this myself. Would it have something to do with the way the susp is set up and the driveline pre-load?...kind of like the 'squat' of the rear when you load up a drag car(but in reverse of course) I've even noticed a slight bouncing when waiting at a stoplight.

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'85 300SD 'Otto' new to us Sept. '07
'82 300SD 'Jurgen' (July '06 fan shaft broke, toasted rad, 3am in the morning 60km from home, walked 16km hitchhiking.... )
'70 SS Chevelle (finally back on my property, in the shop on stands)



"The thinking required to solve a problem cannot be the same thinking used to create it!"-Einstien