2000 Excursion 7.3 Vibration Issues

[Jamessims]

Replaced tires with Michelin m/s2 load range e green x it says 7ply (stock size 16s)... My truck does fine until you get above 75mph then it start vibrating the whole truck. I jacked it up tonight in the rear and had a buddy run it up and the drive train seems fine. I checked the u-joints they have very little play could the A-Arm bushings be causing this or could it be bad new tires or possibly could these tires need more ply to handle the weight at a speed higher than 70mph?

[Turbostang500]

Rotate the tires and see if the vibe moves. If so, head back to the shop.

[Silver200273L]

I agreed with turbostang500. I work at tire place. Make sure they check the balance again. They shouldn't charge u anything.

[Jamessims]

Well when I first got the tires I had to take them back 3times that day because they couldn't balance out right .... then I had them road force tested and the guy said I had a few bent rims so I bought new rims and even with new rims it got better but now vibrates at 75 plus I just had them balanced 3 weeks ago and rotated but I will take them back and do it again just for good measure and let ya know...

[Turbostang500]

Ok, maybe that isnt the problem but still might be.

First, can you describe the vibe as fast, slow, front, rear, pulsing?

[Greenman01]

Universal joints should have zero play.

[Mchek]

what ply are your tires? with how much an Ex weights i would only run 10 plys on them.