Noise on my 52 1/2 ton: Spring bushings(all of them). Bed mounts(rusted bolts, and bad wood blocks). Collapsed cab mounts(the front under the floor), and...loose glass in the wing windows. Then the best for last, a failed pinion bearing(driveshaft whip). King pins were worn(the bushings any way) and some crappy bias ply tires. Now? Not as quiet as a new car but I can listen to the radio at 60mph. Plenty of wind noise(still needs some rubber in the doors) and I did put sound deadener under the seat(that helped). Except for the Pinion bearing, it was typical old truck stuff.
