Hello all, I am a new member and a new 07' F150 owner. I just purchased a 07' F150 crew with a procomp 6" lift. Two days after I purchased it I noticed a leak at the rear pinion seal and the output seal on the rear drive shaft. I took it to a Ford dealer and they replaced along with a new rear drive shaft.

I drove it home and at 50 and above it has a major vibration. I took it back and the tech checked it out and told me the pinion angle is not in spec. because of the lift. I have since tacken back to the Chevy dealer I bought it from and they are having a hard time finding the problem.

Has anyone encountered this problem or have any input?

I think it may be the drive shaft out of balance or the front drive shaft, but I am not a expert.

Thank You.