Need Help with a vibration in my Jimmy

[jeff r]

I have a 1972 GMC Jimmy auto with 4wd. I bought the Jimmy 6 months ago and it had a old tires on it. I replaced the tires with 31" tires.

When the Jimmy gets to 55mph I can feel a vibration in rear. I had my father-in-law follow me today and he said the right rear had a wobble.

I lifted the Jimmy and shock the tire and had a little play up and down but couldn't feel any side to side. I also check the other side and it was tight. I can't here any noise going down the road.

Is it the rear end or bearing?


Jeff