So heres the deal. I lited my truck 6" and put 36" STS interco swampers on 16" rims. I am getting some pretty good vibrations as the truck speeds up and its pretty unbearable on the freeway.
I put a steering damper on it....little help
I have rotated the tires and the vibration changes so I'm thinking either one of the tires wasnt balanced correctly or a rim or tire is simply not perfectly round.

Any suggestions?????

 

Sounds like the wheels/tires are balanced, one or more of the trires are bad, or you have warped wheel.
Have wheel/tire combo road force balanced.

 

I second that. Sounds like a balance problem to me too

 

balance problem, might of thrown a weight, or do you have mud build up in the rim??? even alittle does the trick

 

Any tire over 33 inches I have them trued and balanced and they will ride like a cadilac, even though you are cutting the high spots they will last much longer it is worth the money, just my .02 cents