Anyone know the issue?

[Ccrawls]

I bought my 2015 GMC Sierra all terrain in August and I switched over to winter tires early December and on a stormy day I switched into 4 wheel drive anyways it got stuck in 4wd which I believe was a recall anyways I drove around for 2 weeks with it stuck I couldn't get in any sooner anyways that problem is fixed but now anytime I go over 100 km/h my truck shakes steering wheel/tires anyone know the issue ? Tires no balanced correctly ? Or was driving around with 4wd having to do it with? It wasn't like it before I switched tires over and or had the 4wd issue

[redwngr]

Dry paved road?

[Ccrawls]

Did I ? Or is it happening on dry pave road?

[Zachlovesfood]

My truck had vibration issues and wasn't hitting bumps very nicely. After trial and error trying to fix it, finally found the stock u-bolts were assembled below torque spec. Got a torque wrench and cranked them up to 135 ft. lbs. and my problem was solved. Checking them couldn't hurt. Hope it helps.

[morrislee]

I bought my 2015 GMC Sierra all terrain in August and I switched over to winter tires early December and on a stormy day I switched into 4 wheel drive anyways it got stuck in 4wd which I believe was a recall anyways I drove around for 2 weeks with it stuck I couldn't get in any sooner anyways that problem is fixed but now anytime I go over 100 km/h my truck shakes steering wheel/tires anyone know the issue ? Tires no balanced correctly ? Or was driving around with 4wd having to do it with? It wasn't like it before I switched tires over and or had the 4wd issue

I have bad vibration until I realize the factory tire pressure spec is too low. I have it at 39 psi at warm, around 270kpa. This seems to solve my vibration at 120KM/h

 

I think the tire pressure on the ground is different than when the truck is on the rack with 4 wheels hanging which may have been what they clain the pressure to be at state.