Right. These trucks don't need steering dampers so try harder to figure out where your vibration is coming from.
If everything were within factory specifications, you wouldn't have a serious, intermittent steering wobble.
First, I'd swap the tires front to back and back to front. See what happens. Are they new tires? Are they new rims? When were they last balanced?
What items did you check and how did you check them?
Have you taken any frame measurements? Height from ground on both sides at different places? Diagonal front to back, etc?Are your cab mounts worn out/missing?
How did you test the steering gear?
Steering shaft, steering gear, Pitman arm, tie rod ends, drag link, king pins, front and rear springs, shackles, shocks, frame, tires, rims, axle, wheel bearings, caster angle (shims required), toe angle, probably stuff I'm forgetting.
Has the truck always had a wobble? If not when did it start and what was done to the truck immediately prior to the wobble?
