Re: Strange vibration at 60 MPH and above.
In these trucks the carrier bearing is a normal wear and service item and needs to be replaced. How often I don't know, but if you haven't done it on that truck, odds are that's the culprit.
After that the normal suspects of driveshaft, u-joints, wheels, etc...
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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