Do you have a posi rear-end? When they start making noise it is usually just on right hand turns. GM makes an additive that will usually shut them up if that is the problem. Cab mounts? Lug Nuts? Hard to tell without hearing it. It might help to get someone to drive the truck while you ride it the back to help track down where the noise is coming from. Noises will really fool you on where they are actually coming from when listening in the cab.
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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS
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