Buy OEM Ford Part # NL1Z3K186C (NL1Z-3K186-C). Steering Knuckle (Front). 4WD. 4WD, w/o Timberline. Expedition, Navigator; Left; w/o Performance Version. RWD. RWD, w/o Timberline

Knuckle.
A Knuckle used on a steering axle that has no additional components attached. Wheel. Spindle. Steering.

Steering Knuckle

Fits Expedition, Navigator

4WD. 4WD, w/o Timberline. Expedition, Navigator; Left; w/o Performance Version. RWD. RWD, w/o Timberline.
Steering Knuckle - Repair or Replace
The steering knuckle in your may need to be replaced if it has become damaged or rusty, which will usually be determined during a related repair.