92 chevy 1500

i have a virbation when i'm going about 50-60 miles per hour. if i let off the gas then you don't feel it. i had new tires on it and it is still doing it. and it is not in the steering wheel.
can anyone help....

Wheel balance.

I am leaning towards the gears in the rearend. I had the same kind of viabration in an 88 full size Jimmy i had once and it was the spider gears.

i have a virbation when i'm going about 50-60 miles per hour. if i let off the gas then you don't feel it. i had new tires on it and it is still doing it. and it is not in the steering wheel.
can anyone help....


Check the U-joints.