Analysis of Vibration
WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
Few vibration conditions are caused by the rear axle. On a vibration concern, follow the diagnosis procedure in NOISE, VIBRATION AND HARSHNESS (NVH) unless there is a good reason to suspect the axle.