This procedure covers the removal and replacement of the lower control arm on a 2011-2014 Ford F-150 with 3.5L EcoBoost engine and 4WD, including ball joint separation and proper torque sequencing.

Warnings

Tools required

Parts

• Lower control arm assembly × 1 — Use OEM specification or equivalent with ball joint pre-installed
• Ball joint castle nut (if not included) × 1 — M14 castle nut with cotter pin
• Cotter pin for ball joint × 1 — 3/16 inch diameter

Preparation

1. Park vehicle on level surface and engage parking brake
2. Chock rear wheels securely
3. Loosen front wheel lug nuts while vehicle is on ground (do not remove)
4. Raise front of vehicle and support on jack stands at frame rails behind lower control arms
5. Remove wheel and tire assembly completely
6. Spray penetrating oil on ball joint nut, control arm bolts, and allow 15-20 minutes to soak
7. Visually inspect control arm bushings and ball joint boot for existing damage

Procedure

1. 1

   Support the knuckle assembly
   Position a floor jack under the lower control arm near the ball joint to support the knuckle and spring load. Raise jack just enough to take light pressure but not lift the vehicle. This prevents the knuckle from dropping when the ball joint is separated.
2. 2

   Remove ball joint cotter pin and nut
   Straighten and remove the cotter pin from the ball joint castle nut using pliers. Using an 18mm socket, remove the ball joint nut completely. Note the position and condition of the nut for comparison with replacement part.
3. 3

   Separate ball joint from knuckle
   Insert a ball joint separator tool or pickle fork between the lower control arm and steering knuckle. Strike the tool firmly with a hammer to break the taper fit. The ball joint stud should pop free from the knuckle. If using a pickle fork, the ball joint boot will be damaged (acceptable if replacing entire control arm).
   ⚠Ball joint may release suddenly. Keep hands clear of pinch points between control arm and knuckle.
4. 4

   Remove front control arm mounting bolt
   Locate the front control arm bolt that passes through the front bushing and frame bracket. Using a 21mm socket and breaker bar, remove the nut from the bolt. Drive or pull the bolt out of the bushing. This bolt may be tight due to bushing compression.
5. 5

   Remove rear control arm mounting bolt
   Locate the rear control arm bolt that passes through the rear bushing and frame bracket. Using a 21mm socket and breaker bar, remove the nut from the bolt. Drive or pull the bolt out of the bushing. Support the control arm as you remove this last fastener.
6. 6

   Remove control arm from vehicle
   With both mounting bolts removed and ball joint separated, maneuver the lower control arm down and out from the frame mounting brackets. You may need to rotate or angle the arm to clear suspension components and the frame. Inspect the frame mounting brackets for damage or corrosion.
7. 7

   Prepare mounting points
   Clean the frame mounting bracket bores with a wire brush to remove rust and debris. Clean the ball joint taper bore in the steering knuckle. Inspect mounting bolt threads and replace if damaged. Apply a thin coat of anti-seize to bolt threads (not on taper or bushing contact surfaces).
8. 8

   Install new control arm
   Position the new lower control arm into the frame mounting brackets. Insert both front and rear mounting bolts through the bushings and brackets, but do NOT tighten yet. Thread nuts onto bolts hand-tight only. Ensure the control arm moves freely on the bolts.
9. 9

   Connect ball joint to knuckle
   Raise the floor jack under the control arm to align the ball joint stud with the hole in the steering knuckle. Push the stud through the knuckle taper. Install the new castle nut on the ball joint stud and tighten to specification. The stud should pull fully into the taper as you tighten.
   Torque spec

   Ball Joint Nut101 Nm (75 lb-ft)
10. 10

    Install cotter pin
    Align the castle nut slots with the cotter pin hole in the ball joint stud. If slots do not align, tighten the nut slightly (never loosen) until alignment is achieved. Insert new cotter pin through hole and bend ends to secure. Verify cotter pin is properly seated and nut cannot rotate.
11. 11

    Reinstall wheel and lower vehicle
    Install the wheel and tire assembly. Thread lug nuts hand-tight in a star pattern. Lower the vehicle until the tire just touches the ground but jack stands still support most of the weight. Remove jack stands, then lower vehicle completely so full weight is on all four wheels.
12. 12

    Torque control arm bolts with weight on wheels
    With the vehicle sitting on the ground at normal ride height, crawl under and torque both the front and rear lower control arm mounting bolts to specification using a 21mm socket and torque wrench. This is critical - torquing with suspension hanging will cause premature bushing failure.
    ⚠️Vehicle must be on the ground with full weight on suspension. Torquing in the air will destroy bushings within weeks.
    Torque spec

    Control Arm Bolts165 Nm (122 lb-ft)
13. 13

    Torque wheel lug nuts
    Torque all wheel lug nuts to specification in a star pattern using a torque wrench and 19mm socket. Make at least two complete passes in the star pattern to ensure even torque distribution.
    Torque spec

    Wheel Lug Nuts156 Nm (115 lb-ft)

Reassembly

1. Control arm mounting bolts must be torqued at normal ride height with vehicle weight on wheels
2. Ball joint castle nut requires cotter pin installation - never substitute with standard nut
3. Verify ball joint stud is fully seated in knuckle taper before final torque
4. If replacing only one side, inspect opposite side control arm for wear and consider replacement

Verification

• Bounce the front suspension several times and verify no unusual noises or movement from control arm area
• Visually inspect that both control arm bolts are tight and cotter pin is properly installed
• Test drive at low speed and verify normal steering feel with no clunking or pulling
• Check wheel alignment after test drive - control arm replacement typically requires front alignment
• Re-torque wheel lug nuts after 50-100 miles of driving

More procedures for this vehicle