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Damaged or broken motor mounts are arguably the most serious cause of engine vibration. CarsDirect.com suggests that a driver shift between drive and neutral while the vehicle is sitting still. If the vibration lessens while in neutral, the motor mounts may have sustained damage.
Suspension Problems. Problems in your vehicle's suspension can cause the truck to vibrate. Broken or weak shocks, tie rods, wheel bearings and other components will make your truck's weight distribute unevenly and cause a vibration.