2002 Sierra vibration over 40mph

Msgtman52

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Hey Guys,
Just replaced my 2002 Silverado with a 2002 Sierra 2 wheel drive automatic with 4.8 V8. Basically same truck just different color. I was quite happy with Silverado, just had high miles and the wife told me I could only have one truck at a time :D

Problem is the Sierra has a vibration when I go over 40mph. Never felt anything like that in the Silverado in the 11 years I owned her. Seems to be coming from the rear end. When I throw the truck in neutral at 40 the vibration goes away so I'm not inclined to say tire balance problem.
Any suggestions or idea's?
 


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