WuTang

I'll take it back to discount and have them verify everything was done correctly, and will check the ujoints. I should just have to crawl under the truck, while in park and not running and check for play by grabbing the ujoint and trying to move back and forth, correct?
I plan on correcting the issue with the rotors soon as well. I'll post back and let you guys know what I find out. I appreciate all the responses

SOFLANICK

If its the ujoints does he need to replace all of them? Or just the rear driveshaft ones? I think I'm having the same issue.

And I'm hearing a squeal at very low speeds.

94Brodyf150

I replace in sets of 2. Replace all that are on the same shaft...you might as well since you already have the shaft out. No sense in doing it twice.

94Brodyf150

Up and down back and forth. If you have a helper and your rear brakes are good. Lay on the ground looking at the u joints. Have the helper hold the brakes while engine running and switch between reverse and drive you wil be able to see the output shaft move farther than the drive shaft. Or the shaft move faster than the yoke on you diff.

Also depends on body style. Ext cab long box will have a carrier bearing. Those wear out too and will cause a bad vibe.

94Brodyf150

Why take it back to discount tire? If it was vibrating before the new tires then obviously it's not a tire issue. I worked at discount tire and we inspected every wheel when it was spinning on the balancer. So probably not a wheel issue either. All my previous posts are dumb unless your problem is in the driveshaft. I must have missed the "front" part