This procedure covers the removal and replacement of the lower ball joint on a 2015-2020 Ford F-150 with 5.0L V8 engine. The lower ball joint connects the lower control arm to the steering knuckle and is critical for safe suspension operation.

Warnings

Tools required

Parts

• Lower ball joint (OEM or Moog K500250) × 1 — Moog K500250 or equivalent
• Cotter pin for ball joint × 1 — Use OEM specification
• Anti-seize compound × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Chock rear wheels securely
3. Loosen wheel lug nuts while vehicle is on ground (do not remove)
4. Raise front of vehicle with floor jack at manufacturer-specified lift point
5. Support vehicle securely on jack stands placed at frame rails
6. Remove wheel and tire assembly completely
7. Spray all fasteners with penetrating oil and allow to soak for 10-15 minutes

Procedure

1. 1

   Remove brake caliper and support
   Remove the two brake caliper bolts and carefully lift the caliper off the rotor. Support the caliper with wire or a bungee cord to prevent stress on the brake hose. Do not let caliper hang by the brake line.
2. 2

   Remove sway bar link from lower control arm
   Locate the sway bar link where it connects to the lower control arm. Use an Allen key to hold the shaft while removing the lower nut with a wrench. Remove the link from the control arm.
   Torque spec

   Sway Bar Link76 Nm (56 lb-ft)
3. 3

   Remove ball joint cotter pin and castle nut
   Locate the lower ball joint stud at the bottom of the steering knuckle. Use diagonal cutters to cut and remove the cotter pin. Loosen but do not fully remove the castle nut - leave it threaded on by 2-3 turns to protect threads during separation.
   ℹ️Leaving the nut partially threaded prevents the knuckle from suddenly separating and potentially causing injury.
4. 4

   Separate ball joint from steering knuckle
   Position a ball joint separator tool between the lower control arm and steering knuckle. Tighten or strike the separator to break the taper fit between the ball joint stud and knuckle. Once separated, remove the castle nut completely and lower the control arm away from the knuckle. Support the knuckle to prevent it from falling.
   ⚠The steering knuckle will become loose once the ball joint is separated. Support it to prevent damage to the CV axle boot or brake components.
5. 5

   Mark ball joint orientation
   Before removing the old ball joint, note its orientation in the control arm. Take a photo or mark the position of any flats or alignment features. This ensures correct installation of the new ball joint.
6. 6

   Press out old ball joint
   Position the lower control arm in a ball joint press or C-frame press. Select the appropriate adapters to support the control arm around the ball joint housing. Press the old ball joint out of the control arm, applying steady pressure until it is completely removed. If the ball joint does not move with reasonable force, verify adapter alignment.
   ⚠Ensure press adapters are properly sized and positioned to avoid damaging the control arm. Pressing at an angle can crack or distort the arm.
7. 7

   Clean ball joint bore
   Use a wire brush to thoroughly clean the ball joint bore in the lower control arm. Remove all rust, dirt, and debris. Inspect the bore for damage, cracks, or excessive wear. The bore must be clean and undamaged for proper ball joint seating.
8. 8

   Press in new ball joint
   Apply a thin coat of anti-seize to the outer diameter of the new ball joint (not in the bore). Position the new ball joint in the control arm bore, ensuring correct orientation based on the marks from Step 5. Use the ball joint press with appropriate adapters to press the new joint into place. Press until the ball joint is fully seated and flush with the control arm.
   ⚠Do not press on the ball joint stud or housing threads. Press only on the solid outer body of the joint to avoid internal damage.
9. 9

   Install ball joint to steering knuckle
   Raise the lower control arm to align the ball joint stud with the hole in the steering knuckle. Insert the stud through the knuckle. Thread the new castle nut onto the stud by hand, then tighten to specification. The cotter pin hole in the stud must align with a castle nut slot.
   ℹ️If the cotter pin hole does not align with a castle nut slot at proper torque, tighten further to the next slot. Never loosen the nut to align the cotter pin hole.
   Torque spec

   Ball Joint Nut110 Nm (81 lb-ft)
10. 10

    Install new cotter pin
    Insert a new cotter pin through the castle nut and ball joint stud hole. Bend the ends of the cotter pin outward to secure it, ensuring it cannot fall out. Trim excess length if necessary, but leave enough bent material to retain the pin.
11. 11

    Reconnect sway bar link
    Position the sway bar link to the lower control arm. Install the nut and tighten while holding the shaft with an Allen key to prevent spinning.
    Torque spec

    Sway Bar Link76 Nm (56 lb-ft)
12. 12

    Reinstall brake caliper
    Remove the support wire and position the brake caliper back over the rotor. Install and tighten the caliper bolts to manufacturer specification.
13. 13

    Install wheel and lower vehicle
    Install the wheel and tire assembly. Thread lug nuts by hand to prevent cross-threading. Snug the lug nuts in a star pattern but do not fully tighten. Lower the vehicle until the tire just touches the ground but suspension is not fully loaded. Remove jack stands and lower vehicle completely to the ground.
    Torque spec

    Wheel Lug Nuts169 Nm (125 lb-ft)

Reassembly

1. Torque wheel lug nuts to specification in a star pattern with vehicle on ground
2. Pump brake pedal several times to ensure proper brake caliper piston position before moving vehicle
3. Check brake fluid level in reservoir and top off if necessary with DOT 4 LV fluid

Verification

• Start vehicle and turn steering wheel full lock in both directions while stationary. Listen for any clicking, popping, or binding noises that could indicate improper installation
• Perform a slow-speed test drive (under 15 mph) in a safe area. Feel for vibrations, pulls, or unusual steering behavior
• After test drive, raise vehicle and inspect ball joint for proper seating, cotter pin security, and any signs of movement or looseness
• Verify all fasteners are properly torqued, especially the ball joint castle nut and wheel lug nuts
• Schedule a professional alignment as soon as possible, as suspension work affects wheel alignment and tire wear

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