im not sure if its tires or drive shafts but my truck has really bad vibes while driving. there not that bad at slower speeds but at about 40 to 45 its really bad. i know the shocks are bad but im not sure if that will help any but i am replacing them this weekend how do i fix the vibe problem

 

this is the way my truck is setup for now

 

I doubt changin your shocks will help, but things to look at include u-joints, damaged driveshaft or maybe corroded off balancing tabs on driveshaft (pretty uncommon), maybe your wheels and tires are need balancing or a defect came up in one of the tires. Let us know what you find out!

 

how can you tell if u joints are going bad without pulling out the drive shaft

 

I mean, sometimes you can get away with simply crawling underneath the car, grab a hold on the driveshaft near either of the u-joints and try to move it around to check for excessive play in the u-joints. If either one is really shot to the point where the needle bearings have turned to dust, you would probably see it, but your best bet really is to remove the driveshaft and check for excessive play or binding of the u-joints. Removing it is not that big a deal, but be sure to mark it's position relative to the rear axle flange/coupler before removing. Good luck!

 

thanks for the help. i think my right rear control arm is lose to so i will tighten everything up and check my shafts

 

When ever you get a vibration in the steering or what ever it is all ways go and try to tighten everything you can think of. Most to always that is what it is. Just something that got lose.