jpp747

I have the same problem with my 08 MKZ going thru that range, in acceleration or costing down. The drive shaft was replaced with a 90% improvement. 10 month latter the center support bearing let go with a high pitch noise. Drive shaft was changed again. 2 days after I’ve noticed the same rubble and vibration going thru 50 to 60 mph. Toke it back to the dealer and after 2 days of test they came with the conclusion that the drive shaft was the cause of the rubble. They drove the car without the drive shaft and the car was just like a fwd .No rubble or vibration. After they have contacted Ford Tech Support, they were told that Ford had a new type of drive shaft available for that chronic problem and it would take 10 to 15 days to get it .May be you should get a test drive without the drive shaft. It worked for me, so far. Will let you when the new drive shaft is install.

Ihad the same problem on my 08 MKZ. The dealer changed the drive shaft assembly. Unniversal joint was the cause.