Description of Front Left and Right Auto Locking Hub Pair 600-203 for 1999-2004 Ford F250 F350 F450 F550 Super Duty, 2000-2005 Excursion, 2001-2002 Expedition, Lincoln Navigator
[Product]: Pair 4WD Auto Locking Hub Front Left&Right for 1999-2004 Fo-rd F250 F350 F450 F550 Super Duty, 2000-2005 Ex-cursion, 2001-2002 Expe-dition, Lin-coln Navi-gator # 600-203, 1C3Z3B396CB. [Reference Part Number]: 1C3Z-3B396-CB, 1C3Z3B396CB, 600-203, 600203. Only for 4WD Models with Auto Locking Hubs only. [Fit for Following Models]: 1999-2004 Fo-rd F250 Super Duty 4WD; 1999-2004 Fo-rd F350 Super Duty 4WD; 1999-2004 Fo-rd F450 Super Duty 4x4; 1999-2004 Fo-rd F550 Super Duty 4x4; 2000-2005 Fo-rd Ex-cursion 4WD; 2001-2002 Fo-rd Expe-dition 4WD; 2001-2002 Lin-coln Navi-gator 4WD. [Function]: Mud, rust or worn parts inside the wheel will prevent the mechanism from sliding in and locking the wheel. Anything that restrains the internal mechanism prevents it from sliding and releasing. The most obvious symptoms may be increased fuel consumption, increased noise on the highway and / or increased wear on the front tires. When the locking hub does not work properly, you need to replace it with a new one. [Installation Attention]: 1. If replacing automatic locking hubs with manual locking hubs reinstall the axle shaft splined steel washer or needle thrust bearing and the axle retaining ring. 2. Install the Hublock assembly against the wheel hub and rotor. 3. Install the wheel and tire and torque the lug nuts.