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the rear clutch pack has been replaced before but know it is grinding around slow turns again they said they no longer replace them they only put in a "vibration modifier" that is the stupidist thing ever after it was installed the truck rides real stiff in back just like a regular suspesion what did they do to it.and whay won't they fix the clutch
Never heard of a "vibration modifier"... I suspect they meant a "friction modifier". If so, then all it does is allow the clutches to slip more easily. Not exactly an ideal solution for maximum traction.
As for the ride, I'd bet they didn't get the differential &/or axles back in the vehicle properly. You might crawl underneath and make sure there is plenty of clearance between the driveline components and the frame. Also check the springs & shocks for proper assembly.
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