Torn right side CV joint boot leaking grease. Found after about 1500 miles when I removed the wheel to upgrade rotors. FORD WILL NOT COVER UNDER WARRANTY. Has been a real pain the the rear. Truck has not been off-road and there is no colateral damage from road debris etc. Dealer and ford says it is "impossible" that it is a factory defect...and if it was...would have been caught at PDI. It is very difficult to see within the accordion folds. $529 to replace the boot and joint.