I have an issue when I drive at hwy speed around 110km/h I get this vibration thru my seat and pretty much my whole car.. I went to ford dealership and they replaced the back U-Joint on the driveshaft. It didn't help... It reduced the vibration but it's still there.. My truck always ran smooth even at 160km.. the dealership said that the driveshaft needs to be balanced?? I really don't know how sure they are about that because they thought it was the u-joint which didn't help.. it kind of makes sense now that there is a brand new u-joint on the driveshaft which might cause it to be out of balance... perhaps the weights fell off the shaft so balancing it would solve the problem.. Has anyone had an issue like this and solved it? Thanks for reading and any suggestion on how to troubleshoot this problem would help a lot...

 

2020 lariat 3.5, just got it to 2500kms no issues, then started a strange vibration in cycles of 3, 1 second vibrations ,,accelerating and slight turn of steering wheel, both directions, around 50 to 70 km/h more pronounced.. it doesn't feel like tire balance alignment issue. This is my 3rd f150 since 2015 so it's not normal, gonna take it back see what they say but taking it to a good friend that's a mechanic for an opinion first. Keep you guys posted any help would be appreciated thanks

 

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​​​​ Fixed realized driving today it's the stupid lane assist vibration in the steering wheel. Shut it off. Problem solved. First truck with it so I went expecting vibration but anyhow that was issued