Steering Pinion Shaft problems of the 2002 Land Rover Discovery

The contact owns a 2002 Land Rover Discovery. While driving 65 mph, the rear of the vehicle vibrated violently without warning. The failure recurred each time the speed was above 65 mph. The vehicle was taken to an independent mechanic where the front shaft was replaced twice; however, the failure recurred. The manufacturer was not notified of the failure. The approximate failure mileage was 70,000.