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

Warnings

Tools required

Parts

• Lower control arm assembly × 1 — Use OEM specification
• Cotter pin for ball joint nut × 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. Raise front of vehicle with floor jack at designated jacking point
5. Support vehicle with jack stands placed at frame rail jacking points
6. Remove front wheel on side being serviced
7. Spray all fasteners with penetrating oil and allow to soak for 10-15 minutes

Procedure

1. 1

   Remove sway bar link
   Locate the sway bar link connection to the lower control arm. Hold the link shaft with an Allen key to prevent spinning while using a wrench to remove the lower sway bar link nut. Disconnect the sway bar link from the lower control arm and move it aside.
   Torque spec

   Sway Bar Link71 Nm (52 lb-ft)
2. 2

   Support lower control arm
   Position a floor jack under the lower control arm, close to the ball joint area. Raise the jack just enough to slightly compress the suspension and support the weight of the control arm. This prevents the arm from dropping suddenly when disconnected.
   ⚠The jack must remain in place throughout disassembly to control suspension movement and maintain safe working conditions.
3. 3

   Remove ball joint cotter pin and nut
   Locate the lower ball joint connection at the steering knuckle. Use a pin punch to remove the cotter pin from the ball joint castle nut. Discard the old cotter pin. Using a 24mm socket, remove the ball joint nut completely but leave it threaded on by a few turns to catch the knuckle when the joint separates.
   Torque spec

   Ball Joint Nut102 Nm (75 lb-ft)
4. 4

   Separate ball joint from knuckle
   Insert a ball joint separator tool between the lower control arm and the steering knuckle. Apply pressure using the separator tool while striking the knuckle boss area with a hammer to shock the taper loose. Once the ball joint breaks free from the knuckle taper, remove the castle nut completely and lower the jack slightly to allow the control arm to drop away from the knuckle.
   ⚠Ball joint will separate suddenly. Ensure castle nut is still threaded on to catch the knuckle and prevent damage to brake components or CV axle.
5. 5

   Mark control arm mounting position
   Before removing the control arm mounting bolts, use a paint marker or scribe to mark the position of any alignment adjustment cams or the relationship between the control arm brackets and frame mounting points. This helps restore approximate alignment during reassembly.
   ℹ️A professional alignment will be required after this repair, but marking positions helps minimize initial misalignment.
6. 6

   Remove rear control arm mounting bolt
   Locate the rear control arm mounting bolt that connects the control arm to the frame bracket. Using a 21mm socket and breaker bar, remove the rear mounting bolt completely. Note the orientation of any washers or spacers for reinstallation.
   Torque spec

   Control Arm Bolts165 Nm (122 lb-ft)
7. 7

   Remove front control arm mounting bolt
   Using a 21mm socket and breaker bar, remove the front control arm mounting bolt. Support the control arm with your free hand as you remove the bolt. Once the front bolt is removed, carefully lower and remove the control arm assembly from the vehicle.
   Torque spec

   Control Arm Bolts165 Nm (122 lb-ft)
8. 8

   Clean mounting surfaces
   Use a wire brush to clean the ball joint taper seat in the steering knuckle and the control arm mounting bracket surfaces on the frame. Remove any dirt, corrosion, or old thread locker compound. Inspect the steering knuckle ball joint bore for damage or excessive wear.
   ℹ️If the ball joint taper seat in the knuckle is damaged or elongated, the knuckle must be replaced to prevent ball joint separation.
9. 9

   Install new control arm
   Position the new lower control arm into the frame mounting brackets, aligning with the marks made during disassembly. Insert the front and rear mounting bolts but do NOT torque them yet. Thread the bolts in by hand first to ensure proper alignment, then snug them finger-tight plus approximately 1/4 turn with a wrench.
   ⚠Control arm mounting bolts must NOT be torqued until vehicle weight is on the suspension to prevent bushing bind and premature failure.
10. 10

    Connect ball joint to knuckle
    Raise the floor jack to lift the control arm ball joint into the steering knuckle. Ensure the ball joint stud is fully seated in the knuckle taper. Install the new castle nut and tighten to specification. Align the castle nut slots with the ball joint stud hole, tightening further if necessary to align (never loosen to align). Install a new cotter pin and bend the ends to secure.
    Torque spec

    Ball Joint Nut102 Nm (75 lb-ft)
11. 11

    Reconnect sway bar link
    Position the sway bar link into the mounting point on the lower control arm. Install the sway bar link nut while holding the link shaft with an Allen key to prevent rotation. Torque the nut to specification.
    Torque spec

    Sway Bar Link71 Nm (52 lb-ft)
12. 12

    Install wheel and lower vehicle
    Install the wheel onto the hub, threading lug nuts by hand initially. Tighten lug nuts in a star pattern using a torque wrench to specification. Lower the vehicle completely so that full vehicle weight is on the suspension. Remove jack stands and lower the jack completely.
    Torque spec

    Wheel Lug Nuts156 Nm (115 lb-ft)
13. 13

    Final torque control arm bolts
    With the vehicle weight fully on the suspension and wheels on the ground, crawl under the vehicle and torque both the front and rear lower control arm mounting bolts to specification. This critical step must be performed with the suspension at normal ride height to prevent bushing preload and premature wear.
    ⚠This is the most critical torque step. Bolts torqued with suspension hanging will cause rapid bushing failure.
    Torque spec

    Control Arm Bolts165 Nm (122 lb-ft)

Reassembly

1. Verify all fasteners are torqued to specification
2. Confirm new cotter pin is properly installed and secured in ball joint castle nut
3. Check that sway bar link moves freely without binding

Verification

• Test drive vehicle at low speed in a safe area and verify no unusual noises from front suspension
• Check for proper steering response and no pulling to either side
• Schedule a professional four-wheel alignment as soon as possible after repair
• Perform visual inspection after 50-100 miles to verify all fasteners remain tight and no new issues have developed

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