Hello. I purchased my 2017 F150 XLT a few months ago and did a few upgrades since. I had a company install a 2” Suspention Lift on the front and rear as well as adding new BF Goodrich AT tires 34x10.5x17’s with new wheels. Since this was done, I have a vibration at high speed in the rear of the truck. I thought it was just a wheel balance issue so I took the truck back and the company rebalanced the wheels. They also rotated the tires to see if that would help. The vibration is still there which I feel in my seat. The tire guys said that it must be a drive line issue. Does anyone know what the drive shaft angles should be in front and rear? The guys that installed the lift kit said they did a 4 wheel alieghnment and the truck doesn’t pull. It tracks straight. Not sure where to turn at this point? It didn’t vibrate until this work was done so I’m guessing it’s because of something that was done. Any help would b greatly appreciated.

 

It was not there before.
you did one thing.
It is the tires and rims. Period.
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It's a lot more likely to be a phase angle issue with the driveshaft, considering you lifted the rear and changed the angle of the shaft.
Period....