All,
PLEASE HELP. This is bonkers. I started having a vibration around 50-65 mph and it would go away at 70. I replaced the tires and balance and no change. I replaced the front breaks no change. I did the rears and rotated the tired no change. Over time the vibration started more at 65 and 75 mph. Had the tires balanced and no change. Took it to a shop to assess the issue and suggested a drive shaft carrier or U joint and they found no issue with the alignment or balancing. The shop took the shaft to a shop and the shop said they couldn't balance it because it was a 2 piece. They recommended replacing. So I did and now the vibration is between 25 and 40 mph but highway speed is not an issue. I drove it around and worked through the gears to see if it was a shaft speed issue and no difference. only in the power band while I'm getting t up to speed will this happen but when it was happening at 65-80 mph it didn't really matter. I'm thinking it may be in the transmission. PLEASE HELP!
Patrick

 

What is this on? Can't see your vehicle through the Internet. You need to post details.

 

2014 F150 XLT 5.0L 6 speed automatic