well I found out what was causing some it. it was my tires that I had on my rims. one of them was out of round and the tire was a bfgoodrich fuzion 265/70/17

 

The shop that balanced your tires didn't tell you that one of them was out of round? Not very professional.

 

An out of round tire usually bounces more the faster you go. When a tire bounces only at a certain speed, that is usually from being out of balance.

 

I got a update. yesterday I took my truck in to get the rear end fluid changed. it came out clear but when they took the cover off. there was sludge build up in there from water. and the cover dent from hitting something but it is fixed now. and I still had the vibration after 70 mile drive and I put my stock rims and tires on and the vibration went away. so there is something wrong with my other set of rims and tires

 

What did you put in there? That's what's important.

That would be next to impossible to miss on the balancer. Ah, depends who's doing it or not doing it I guess.

 

I've had tires incorrectly balanced several times.