[KRob]

Hey Team, So old truck got it...350K old truck, so i dont hold it against her.

Between 55 and 60 the doors and mirror especially but in reality, the whole truck starts shaking and vibrating. Get above or below that and no shake, no rattle (Besides old truck rattle). Any thoughts?

I don't feel anything in the steering wheel.

Rob.

 

[bigfish95971]

Welcome, Several possibilities:
Tire balance,
Tire out of round or bubble,
Tire quality,
Tire Air pressure too high/low
Tire wear,
Shocks,
Bent wheel,
Driveline u-joints, carrier bearing or balance,
Alignment or wear in ball joints or other front end parts

 

[KRob]

All good points of direction. Ill take a look at those.

 

[Diesel Pl]

Hmmm the smaller dampening springs spaced around the splined input shaft assembly on the clutch disk cause my out of balance clutch vibration.
Just my two cents .
NV4500 5 speed.

 

[NCC74656]

Go underneath the truck and wiggle your drive shafts, make sure your center carrier bearing on the rear is not loose or disintegrated.



Jack up One tire at a time and wiggle it around, get a pry bar under it and spin it to see if there's any wobble or if it's noticeably loose.



If one of your tires is unbalanced and that's causing this, going to be kind of hard to tell without taking the tires in to a shop to check on their spinner