how about the pinion bearings?

 

I got new wheels got my mud tires balanced and aligned the front end and it semi went away. Still does it on some roads, but the road down here in ga are so bumpy.

 

bent rim

 

My truck came with the 16x7 alloys. The lug holes weren't true on the rear ones. Almost egg shaped. Plus I have cheaper mud tires and the guy at the tire shop said they wouldn't balance correctly..so he put them on the back axle instead of the front. Before I got new rims, my dad and I jacked up the back of the truck and I put the truck in gear and got it up to 45 or so where the shaking was the worst. Both rear tires bounced up and down and side to side.