When ever I get the truck up to 50mph until 60mph it vibrates really bad. What would cause that? Is it b/c my wheels are out of balance or is it something else? Thanks

 

Could be the wheels out of balance.

 

I got the same problem...

And i got the same rims you got Doc..

 

I know I do not have many weights left on the tire as they have been knocked off... I am thinking of getting those beads instead...

 

You didnt say anything about having weights knocked off lol. The tires are out of balance then, go get them balanced or obtain the beads or EQUAL.

 

ya its the wheels mine used to do that same thing!

 

I've torn off wheel weights offroading also!

 

You have the superlift right.. superlift states front driveshaft will wear accellerated
<20000 mile lift expectancy after their lift is put on.. but that might just be bs..
Otherwise wheel weight or tire going bad...

I just noticed on my beater caddy tonight my front tire is waaay out..
The hood is now jumping about an inch if I go over 65 :(

 

Drive shaft was replaced right after the lift so that is not it... Thanks all

 

most tire guy's will tell you "highway speeds = rear tire/tires out of balance"
lower speeds it'll be the front............... something to start with anyway