dfricton

My 2010 F150 was making a thunking sound when stopping and starting. The dealer said that the u joint needed greasing.

After having that done, the truck is now shaking in the left rear at about 57 mph.

I brought it back to dealer and they said everything was fine, and blamed it on the tires.

The tires are pretty new from firestone. I went to Firestone and they said the tires were fine.

What do you guys think I should do? I just went over 60000 miles.

Regular Cab

Sounds like they lubed the slip yoke and NOT the u-joints.Sounds like they got the shaft out of phase when they put it back together.

Mr.Bones

They may have put some one on the job that did not know what in the hell he was doing. I would take it some where else and have them inspect the truck. Sounds like they froget to put somethig back on.

ji603

Probably disconnected the shaft and forgot to mark the alignment before they unbolted it. Driveshaft is balanced, and after they greased the splines, they just bolted it back any old way. The shaft's unbalanced, and making your truck shimmy.

Look under there and see if they drew a line or marked the shaft all the way down from the yoke, across the boot, towards the flange...