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Could be about anything from ball joints to tire balance or even driveshaft balance. Throw the truck on a lift and start yanking on stuff looking for excess play....
Weird noise and bad vibration above 80 kph replaced u joints no difference ram 2500 6.7 2008
Jonesy2469,
Welcome to the forum.
A test drive with a qualified mechanic along with checking components for play as HammerZ71 mentioned should point things in the right direction.
Head down to your local Ram Service facility, they'll have it figured out in no time.