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Original post by: Your ,


I just installed a PP dampener and Balancer on an 07 c15 accert cat with 1,070,000 miles.I have a substantial improvement , much less vibration.I did have to modify the shroud brackets,belt tensioner,and turn the front motor mount bolts around.your vibration could be caused by loose or worn centers on your clutch discs,check this by pushing your clutch in with the engine running  to see if vibrations subside