Well since I got the truck it vibrated between 70-80 mph anything higher or lower it's fine. I had it realigned it helped a little I put new shocks in that might of helped a little more I put new wheel hubs that helped the most now it only does it some times usually as I'm traveling down the highway and I take a curve it starts to vibrate ... Any ideas or help would be appreciated ...

I've had tires balanced many times many sets of wheels also of difrent trucks that ran fine with them

 

What truck? The reason I ask...
http://www.duramaxforum.com/forum/ex...-pit3009j.html

 

Its a 99 silverado rcsb the rounder body style

 

Lowered? Checked u-joints?

 

check your tires for a possible flat spot or brake in the band cause my tire had a brake and it vibrated the entire truck

 

check the u-joint caps were they engage into the yolk there is clips that center them sometimes people loose them or they fall off then the u-joint is off center causes a nice vibration seen it lots,if not pull each drive shaft and check all the u-joints visualy for being loose or spraying rust. If you dont see anything remove the shafts and move the joints check for stiffness and you can even pull the caps look for chatter marks

 

I don't think it's the tires I've ha difrent ones on it also and yea I lowers it it did it also before it was lowers I'll check u joints this weekend

 

does it make sound too or is it more just a feel?

 

Get your pinion angle looked at. Most common issue with vibrations!

 

If it's when you take a curve it sounds like a wheel bearing. Or maybe a tire.