This procedure covers the replacement of front subframe bushings on a 2021-2024 Ford F-150 with 3.5L EcoBoost engine, requiring subframe lowering and component disconnection.

Warnings

Tools required

Parts

• Front subframe bushing set (4 bushings) × 1 — Use OEM specification
• Ball joint cotter pins × 2 — Use OEM specification

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
4. Raise front of vehicle and support on jack stands at frame lift points
5. Remove both front wheels
6. Apply penetrating oil to subframe mounting bolts and allow to soak
7. Inspect subframe bushings to confirm wear or damage requiring replacement

Procedure

1. 1

   Disconnect sway bar links
   Locate sway bar links connecting sway bar to lower control arms on both sides. Use Allen key to hold shaft while removing upper link nuts with socket. Disconnect both sway bar links from control arms.
   Torque spec

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

   Disconnect lower ball joints
   Remove cotter pins from both lower ball joint castle nuts using punch and hammer. Remove ball joint nuts completely. Use ball joint separator or strike control arm with hammer to separate ball joints from steering knuckles. Support steering knuckles to prevent CV axle damage.
   ⚠Do not damage CV axle boots when separating ball joints. Support knuckle assembly to prevent excessive droop.
   Torque spec

   Ball Joint Nut102 Nm (75 lb-ft)
3. 3

   Disconnect steering rack mounting
   Locate steering rack mounting bolts securing rack to subframe. Remove mounting bolts and carefully support steering rack with wire or bungee cord to frame. Do not allow rack to hang by steering shaft or lines.
   ⚠Do not turn steering wheel with rack disconnected. Support rack weight to prevent damage to power steering components.
   Torque spec

   Mounting Bolts31 Nm (23 lb-ft)
4. 4

   Support subframe
   Position transmission jack or subframe support device under center of subframe. Raise jack until it just contacts subframe and takes slight pressure. Ensure jack is stable and properly positioned to support entire subframe weight.
   ⚠️Subframe must be securely supported before loosening mounting bolts. Verify jack stability and capacity.
5. 5

   Remove subframe mounting bolts
   Locate four main subframe mounting bolts (two front, two rear). With subframe properly supported, remove all four subframe mounting bolts using breaker bar and socket. Keep bolts organized for reinstallation.
   ⚠Subframe will drop slightly when bolts are removed. Ensure jack is properly positioned to control descent.
6. 6

   Lower subframe
   Carefully lower transmission jack to drop subframe approximately 4-6 inches. Lower slowly and check for any interference with brake lines, wiring harnesses, or other components. Stop if excessive resistance is encountered.
   ⚠Monitor all attached components during lowering. Do not overextend brake lines or wiring.
7. 7

   Remove old bushings
   Access each of the four subframe bushing mounting locations. Using bushing press or hydraulic press, press out old bushings from subframe mounting points. Clean bushing bores thoroughly with wire brush, removing all debris and corrosion.
   ℹ️Note orientation of bushings before removal. Some bushings may have directional installation requirements.
8. 8

   Install new bushings
   Apply light coat of soapy water or bushing installation lubricant to new bushings and bores. Using bushing press, carefully press new bushings into subframe mounting points. Ensure bushings are fully seated and properly aligned. Verify all four bushings are installed square and flush.
   ⚠Do not use petroleum-based lubricants on rubber bushings. Press bushings straight to avoid damage or misalignment.
9. 9

   Raise and align subframe
   Raise transmission jack to lift subframe back to original mounting position. Align subframe mounting holes with frame mounting points. Use pry bar if needed to achieve proper alignment. Verify all four mounting holes align before installing bolts.
   ℹ️Subframe alignment is critical for proper suspension geometry. Take time to ensure accurate positioning.
10. 10

    Install subframe mounting bolts
    Install all four subframe mounting bolts finger-tight first. Verify subframe alignment is correct. Torque subframe mounting bolts to manufacturer specification in cross pattern (front left, rear right, front right, rear left) to ensure even seating.
    ℹ️Subframe bolt torque specifications not provided in database. Consult Ford service manual for proper torque value, typically 140-200 Nm.
11. 11

    Reconnect steering rack
    Position steering rack back to subframe mounting location. Install steering rack mounting bolts and torque to specification. Ensure rack moves freely and is properly secured.
    Torque spec

    Mounting Bolts31 Nm (23 lb-ft)
12. 12

    Reconnect lower ball joints
    Guide lower ball joint studs back into steering knuckle tapered holes. Install ball joint castle nuts and torque to specification. Install new cotter pins through castle nut slots and ball joint stud holes. Bend cotter pin ends to secure.
    ⚠Always use new cotter pins. Ensure cotter pin is properly installed through stud hole before bending ends.
    Torque spec

    Ball Joint Nut102 Nm (75 lb-ft)
13. 13

    Reconnect sway bar links
    Connect sway bar links to lower control arms. Hold shaft with Allen key while installing and torquing link nuts to specification. Verify links are properly seated in control arm mounting points.
    Torque spec

    Sway Bar Link71 Nm (52 lb-ft)
14. 14

    Install wheels and lower vehicle
    Install both front wheels and hand-tighten lug nuts in star pattern. Lower vehicle until tires just touch ground but weight is still on jack stands. Torque wheel lug nuts to specification in star pattern. Fully lower vehicle and remove jack stands.
    Torque spec

    Wheel Lug Nuts156 Nm (115 lb-ft)

Reassembly

1. Verify all fasteners are properly torqued before test driving
2. Ensure all cotter pins are properly installed and secured
3. Check that no tools or parts were left in wheel wells or under vehicle
4. Remove transmission jack and support equipment from under vehicle

Verification

• Test drive vehicle at low speed and verify no unusual noises from front suspension
• Check for proper steering response and alignment
• Verify no clunking or knocking sounds over bumps indicating loose components
• Schedule front end alignment within 100 miles as subframe removal affects alignment settings
• Perform visual inspection under vehicle to confirm all components are properly secured
• Recheck subframe mounting bolt torque after 50-100 miles of driving

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