Joker:
It starts to get noticeable at around 25 or 30 and it gets louder (sort of like fast pulsing drone) and the vibration gets faster as speed increases. By the time I'm going around 50 its loud enough to be very annoying. The vibration in the steering wheel is very fast. I have not tried going any faster for safety reasons. It makes zero difference when I shift into neutral, push in the clutch, press on the gas pedal, let go of the gas pedal, etc. It seems strictly related to the speed the truck is going, not the engine speed. I'm hoping that the ideas you guys have given me will be visible when I do the axle stand test.
It really has me perplexed!
