Find out more about AMSOIL Products by going to: ?zo=10458\rbr\rbrThis video demonstrates the procedures for replacing the rear differential fluid in a 2001 Ford F150. \rbr\rbrProducts used:\rbr\rbrAMSOIL Severe Gear SAE 75W140\rbr\rbr\rbrAMSOIL Hand Pump for Bottles\rbr\rbr\rbrAMSOIL Fluid Extrion Pump\rbr\rbr\rbrThe manufurer recommends this procedure being completed every 30,000 miles or 2 years. However, with the use of superior lubricants such as AMSOIL Severe Gear 75w140, you can extend the drain interval. AMSOILs Severe Gear 75w90 is rated for 50,000 miles for severe service and 100,000 miles for normal service.