This is applicable for your 1999 F-250, 2000 F-350, 2001 F-450, 2002 F-550 and 2003 Excursion 4x4 vehicle. If you need to replace any parts on the steering and suspension components like u-joints, including ball joints then youre going to need to replace also the vacuum seal to avoid leakage using this vacuum seal tool for proper installation. The Axle Shaft Seal Tool is made of fine steel and designed with handle and correct ridges to fit ford vehicles.