Buy 2001 Ford F-150 5.4L Triton V8 CNG A/T RWD XLT Crew Cab Pickup Fleetside Coil Spring Damper. 142 Wedge, Wheelbase - OEM Ford Part # HC3Z5A313A (HC3Z-5A313-A)

Bumper.
A component (mounted in the center of the spring) which cushions the spring as it is compressed. Auxiliary spring. Boot. Bushing stop. Coil Spring Damper. Knuckle. Lower Control arm. Shock. Spring seat stop. Suspension crossmember. Track bar. Trailing arm stop. Wedge Assembly.

Coil Spring Damper

Fits F-250 Super Duty, F-350 Super Duty

142" wheelbase, dual rear wheels.
Suspension Coil Spring - Repair or Replace
Your coil springs are not especially prone to failure, but if they have been cut, clamped, or heated to have the vehicle lowered, your 2001 Ford F-150 might benefit from replacing the strut springs. Excessive rust can make the springs more prone to failure. Contact your local Ford service department to have your suspension system evaluated.