This procedure covers the removal and replacement of the front upper control arm on a 2021-2024 Ford F-150 with 3.5L EcoBoost engine, including ball joint separation and proper torque specifications at ride height.

Warnings

Tools required

Parts

• Upper control arm assembly × 1 — Use OEM specification or equivalent
• Ball joint castle nut (if not reusable) × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Place wheel chocks behind rear wheels
3. Loosen front wheel lug nuts while vehicle is on ground (do not remove)
4. Lift front of vehicle and support frame on jack stands behind lower control arms
5. Remove front wheel completely

Procedure

1. 1

   Access upper control arm area
   Inspect the upper control arm mounting area. Spray penetrating oil on the ball joint castle nut and control arm frame mounting bolts. Allow to soak for 5-10 minutes if fasteners show corrosion.
2. 2

   Support lower control arm
   Position a floor jack under the lower control arm ball joint area to support the suspension assembly. Raise jack just enough to take slight tension off the upper ball joint, but do not lift the vehicle. This prevents the suspension from dropping when the upper ball joint is separated.
   ⚠The jack under the lower control arm must remain in place throughout the procedure to support suspension weight.
3. 3

   Remove upper ball joint castle nut
   Remove the cotter pin from the ball joint castle nut if equipped. Using an 18mm socket, remove the castle nut securing the upper ball joint to the steering knuckle. Keep the nut if it is in good condition with clean threads and intact castle slots.
4. 4

   Separate ball joint from knuckle
   Using a ball joint separator tool or pickle fork, separate the upper ball joint stud from the steering knuckle. Position the separator between the control arm and knuckle, then strike or apply pressure until the taper releases. Avoid damaging the ball joint boot if reusing the control arm.
   ⚠Ball joint tapers can release suddenly. Keep hands clear of pinch points.
5. 5

   Remove front control arm mounting bolt
   Locate the front upper control arm-to-frame mounting bolt. This bolt passes horizontally through the control arm bushing into the frame bracket. Using an 18mm socket and wrench, remove the bolt completely. Note the orientation and any alignment shims or washers.
6. 6

   Remove rear control arm mounting bolt
   Locate the rear upper control arm-to-frame mounting bolt. Using an 18mm socket and wrench, remove this bolt completely. The control arm should now be free from the vehicle. Note the position of any alignment cams or eccentric washers for reassembly reference.
7. 7

   Remove upper control arm
   Carefully maneuver the upper control arm out of the frame mounting brackets. Inspect the frame mounting points and clean any dirt, rust, or debris with a wire brush. Compare the new control arm to the old unit to verify correct fitment and ball joint orientation.
8. 8

   Install new upper control arm
   Position the new upper control arm into the frame mounting brackets. Ensure any alignment cams or eccentric washers are positioned as noted during removal. Insert both front and rear mounting bolts finger-tight only. Do not torque at this time.
   ℹ️Control arm mounting bolts must NOT be torqued until vehicle is at ride height in final step.
9. 9

   Connect ball joint to knuckle
   Guide the upper ball joint stud into the steering knuckle hole. You may need to use the floor jack under the lower control arm to raise or lower the knuckle slightly for alignment. Install the castle nut onto the ball joint stud and tighten.
   Torque spec

   Ball Joint Nut115 Nm (85 lb-ft)
10. 10

    Install cotter pin
    If the castle nut has cotter pin holes, install a new cotter pin through the ball joint stud and castle nut slots. Bend the cotter pin ends to secure. If the holes do not align at proper torque, tighten the nut slightly (never loosen) until the next slot aligns with the hole.
11. 11

    Reinstall wheel
    Mount the wheel onto the hub and install all lug nuts by hand. Lower the vehicle from the jack stands until the tire just touches the ground but the vehicle weight is still partially on the stands. Torque the lug nuts in a star pattern.
    Torque spec

    Wheel Lug Nuts156 Nm (115 lb-ft)
12. 12

    Torque control arm bolts at ride height
    Lower the vehicle completely to the ground so the suspension is at normal ride height with full vehicle weight on the wheels. Torque the front and rear upper control arm-to-frame mounting bolts to specification. This is critical for proper bushing alignment and longevity.
    ⚠This step MUST be performed with vehicle at ride height. Torquing with suspension hanging will cause premature bushing failure and poor handling.
    Torque spec

    Control Arm-to-Frame Bolts150 Nm (111 lb-ft)

Reassembly

1. Ensure all fasteners are torqued to specification
2. Verify cotter pin is properly installed and secured on ball joint castle nut
3. Remove floor jack from under lower control arm
4. Double-check wheel lug nuts are torqued in star pattern

Verification

• Perform a visual inspection of all mounting bolts and ensure nothing is loose
• Test drive vehicle at low speed and verify no clunking or unusual noises from front suspension
• Check steering response and verify vehicle tracks straight
• Schedule a professional alignment as upper control arm replacement will affect camber and caster settings

More procedures for this vehicle