Feature: , well packed, made with high quality, durable to use. matters, that is why the bodies of our lock out hubs are crafted from reinforce material, feature anticorrosion and high impact resistant. Deliver better 4WD performance when locked and improved fuel economy in 2WD when unlocked. part number: 1C3Z-3B396-CB, 1C3Z3B396CB, 600-203, 600203. Easy replacement: Take off hubcap if your truck is equipped with flat blade screwdriver or prybar. No need to remove wheel. Pull out the retaining ring. FIRMLY grasp the lockout portion of the hub, up and down while pulling from the vehicle.Install propernew locking hub in reverse order of previous steps. Locking hubs are popular accessories for preparing to or disengage your front wheels in a 4WD vehicle. Through years of use and abuse, your locking hubs may become damaged or well worn. stocks a line of direct fit replacements to proper 4WD operation. Compatible with(For exact years and models, please check compatibility.) F250 5.4L 6.0L 6.8L 7.3L 1999-2004 F350 5.4L 6.0L 6.8L 7.3L 1999-2004 F450 6.0L 6.8L 7.3L 1999-2004 F550 Super Duty 6.0L 6.8L 7.3L 1999-2004 Excursion 6.0L 6.8L 7.3L 2000-2005 Expedition 4.6L 5.4L 2001-2002 Navigator 5.4L 2001-2002 What is it? Most part-time 4WD vehicles have locking hubs on the front wheels. When the 4WD is not engaged, the locking hubs disconnect the axle. They spin freely, and the rear wheels of the car do all the work of moving the vehicle. When 4WD is engaged, the locking hubs lock in the front wheels to the front axle allowing them to get torque from the engine. Mud, rust or worn parts inside the hub can prevent the mechanism from sliding in and locking the hub. Anything that binds the internal mechanism can prevent it from sliding and releasing. The most noticeable symptoms may be an increase in fuel consumption, noise on the highway and/or increased front-tire wear.When locking hub can not work properly, you need to replace a new one. How to Replace the Locking Hub? Material: ABS colour: black Package Contents: 2 x Locking Hub Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.