Zone Off Road 4" Lift Kit — Ford F-150 4WD (Strut Spacer / FOX 2.0 Adventure Series Rear Shocks, 3" Rear Block) SKU: ZONF91F

Overview

This is Zone Off Road's 4" lift kit for the Ford F-150, 4WD, configured with OE strut spacers up front (retaining the factory front struts) and upgraded FOX 2.0 Adventure Series rear shocks, paired with a 3" rear block kit. The system is built around USA-made, precision-engineered steering knuckles that correct suspension geometry at the taller ride height, and clears up to 35" tires.

Before ordering: This kit does not fit diesel models or Tremor models, and will not work with trucks equipped with CCD (Continuous Controlled Damping). It requires frame bracket modification. Models with a 2-piece rear driveshaft will require a carrier bearing shim kit (Zone part D5405, not included) — and Ford issued Safety Recall 21S25 covering the rear driveshaft on some 2-piece-driveshaft trucks; Zone recommends completing that recall before installing this lift. Fitment coverage varies by model year and trim — confirm your exact configuration against the Verified Fitment table before ordering.

Required separately: Carrier bearing shim kit D5405, required on models with a 2-piece rear driveshaft (not included). 18" or larger wheels are required — stock 17"/18" wheels cannot be reinstalled. ADAS camera, radar, and sensor recalibration is likely necessary after installation and is the vehicle owner's responsibility and expense, arranged through a dealership or ADAS service center.

Verified Fitment

Ford F-150, 4WD

Limited and SSV trims are verified for 2021–2023 only — not listed for 2024–2026. Lariat is not listed for 2024 or 2026, but is verified again for 2025. STX first appears in 2024. Confirm your exact model year and trim against this table rather than assuming uniform coverage across 2021–2026.

Component Specifications

What Is and Is NOT Included

Included:

• Heavy-duty crossmembers
• Differential drop
• Sway bar drop brackets
• Skid plate
• Rear lift blocks (3" block kit, this configuration)
• New U-bolts
• Front strut spacers
• FOX 2.0 Adventure Series rear shocks
• USA-made steering knuckles

Not included:

• Carrier bearing shim kit D5405 (required for 2-piece rear driveshaft models)
• Front struts (this configuration retains your factory front struts via strut spacers — it does not include replacement struts; see Product Family Reference for the loaded-strut configuration)
• 18"+ wheels and tires
• ADAS/ESC recalibration service

Critical Compatibility

• Does not fit diesel models.
• Will not fit Tremor models.
• Will not work with trucks equipped with CCD (Continuous Controlled Damping).
• Requires frame bracket modification.
• 2-piece rear driveshaft models: Require carrier bearing shim kit D5405 (not included). Some 2-piece-driveshaft trucks are covered under Ford Safety Recall 21S25 for the rear driveshaft; Zone recommends completing that recall before installing this lift.
• Wheel and tire requirements: 18" or larger diameter wheels required — stock 17" and 18" wheels cannot be reinstalled. Stock 20" wheels can be reused with up to a 305/60R20 tire. 18" wheels with 5"–5.5" backspacing should be test-fit before mounting the tire, to confirm clearance to the steering knuckle/tie rod. 18"–20" wheels with 5.5"–5.75" backspacing are highly recommended for tire-to-frame crash bar clearance.
• Crash bar modification: May be required depending on wheel and tire choice, and is required for 37" tires. Confirming that any such modification is non-detrimental to vehicle safety is the end user's responsibility.
• ADAS recalibration: Recalibration of driver-assistance cameras, radar, LiDAR, and other sensors may be necessary after installation, arranged through a dealership or ADAS service center, at the vehicle owner's expense — similar to a wheel alignment.
• Rear block sizing: This configuration uses the 3" rear block. A 2" rear block option also exists for this kit; do not substitute block heights from the separate Loaded Strut front configuration, which uses different block-height recommendations (see Product Family Reference).

Installation Notes

Estimated install time is 8–10 hours; Zone rates this installation as Difficult. Professional installation is strongly recommended. If your truck has a 2-piece rear driveshaft, address Ford Safety Recall 21S25 (if applicable) before installation, and install carrier bearing shim kit D5405 (sourced separately).

Frame bracket modification is required as part of this installation. After installation, arrange ADAS camera, radar, and sensor recalibration through a dealership or ADAS service center. Refer to the current Zone Off Road installation instructions supplied with this kit for complete procedures, torque specifications, and all safety requirements.

The Obsidian Take

The ZONF91F is Zone Off Road's 4" F-150 lift kit in its strut-spacer front / FOX 2.0 Adventure Series rear configuration, paired with the 3" rear block for a level-to-tail-high stance. It retains your factory front struts while correcting suspension geometry through Zone's USA-made steering knuckles, and clears 35" tires without modification. The FOX 2.0 Adventure Series rear shocks step up from the base Nitro Series with an IFP monotube design and race-developed valving. Confirm these application conditions before ordering: it doesn't fit diesel or Tremor trucks or anything with CCD, it requires frame bracket modification, and 2-piece-rear-driveshaft trucks need the separately-sourced D5405 shim kit — and should have Ford's 21S25 recall addressed first if applicable.

This Product Is For You If

• You own a 2021–2026 Ford F-150, 4WD, whose exact model year and trim appears in the Verified Fitment table.
• You want to retain your factory front struts via strut spacers rather than upgrading to loaded struts.
• You want upgraded FOX 2.0 Adventure Series rear shocks over the base Nitro Series option.
• You want a level-to-tail-high rear stance from a 3" rear block.
• You are running up to 35" tires (or prepared to modify crash bars for 37").
• You are prepared for a difficult, 8–10 hour professional installation involving frame bracket modification.

This Product Is Not For You If

• You own a diesel or Tremor F-150.
• Your F-150 is equipped with CCD (Continuous Controlled Damping).
• You have a 2-piece rear driveshaft and are not prepared to source the D5405 shim kit separately, or haven't addressed Ford Safety Recall 21S25 if it applies to your truck.
• You want a fully loaded front strut rather than retaining your factory strut with a spacer — see the Loaded Strut configuration instead.
• You want a tail-low-to-level rear stance rather than level-to-tail-high — see the 2" rear block configuration instead.
• You don't need the upgraded FOX rear shocks — see the Nitro Series rear shock configuration (ZONF91N) for a lower-cost option.
• You are not prepared to budget for ADAS recalibration after installation.

Product Family Reference

Other configurations of this same kit include:

• Front: Zone Nitro loaded struts (fully assembled, bolt-in) instead of strut spacers, paired with matching Zone Nitro rear shocks
• Rear block: 2" block kit instead of 3" (tail-low-to-level stance)

Note: the Loaded Strut front configuration has different rear block height recommendations (5" for a level stance, 4" for tail-low) than this Strut Spacer configuration — don't cross-reference block height guidance between the two front configurations.

Zone also offers a 6" suspension lift system for the F-150; see Zone's product line for details.

Common Questions

Does this fit diesel F-150s?
No.

Does this fit the Tremor package?
No.

Will this work with my adaptive/continuously controlled dampers?
No — this kit will not work with trucks equipped with CCD (Continuous Controlled Damping).

I have a 2-piece rear driveshaft — what do I need to know?
You'll need carrier bearing shim kit D5405, sourced separately (not included). Some 2-piece-driveshaft trucks are subject to Ford Safety Recall 21S25 for the rear driveshaft; Zone recommends completing that recall before installing this lift.

What tire size does this kit support?
Up to 35" without modification. 37" tires are possible but will require crash bar modification.

What wheels do I need?
18" or larger diameter. Stock 17" and 18" wheels cannot be reinstalled. Stock 20" wheels can be reused with up to a 305/60R20 tire.

What's different about the FOX 2.0 Adventure Series shocks compared to the Nitro Series?
The FOX 2.0 Adventure Series uses a 2" diameter steel body with an internal floating piston (IFP) monotube design, a 5/8" hard chrome plated shaft, race-developed high-flow piston, and application-specific valving, finished in clear anodizing.

Do I need an alignment or ADAS recalibration after installation?
ADAS camera, radar, LiDAR, and sensor recalibration is likely necessary and should be arranged through a dealership or ADAS service center, at your expense — similar to a wheel alignment.

Is this compatible with Ford BlueCruise?
Yes, per Zone's specifications.

What's the difference between the 3" and 2" rear block?
The 3" block (this configuration) gives a level-to-tail-high appearance. A 2" block gives a tail-low-to-level stance. Both replace the factory 1-1/4" block, which is not reinstalled.

What is the warranty?
Zone's Factory Protection Plus program on this kit includes ESC system compatibility, a limited lifetime warranty, and a 5-year/60,000-mile drivetrain warranty. See full warranty summary below.

Manufacturer Data Disclaimer

Fitment, specification, compatibility, and installation data for this kit are sourced from Zone Off Road manufacturer product documentation and OFAS-verified product data current as of publication. Specifications are subject to change without notice; confirm current documentation for this SKU at the time of purchase.

Required Legal, Warning, Fitment, and Return Notices

Safety Warning: This kit requires frame bracket modification and affects suspension and steering geometry. Professional installation is strongly recommended. Crash bar modifications, if required for your wheel and tire choice, are the end user's responsibility to confirm as non-detrimental to vehicle safety. ADAS recalibration after installation is necessary to maintain proper functionality of lane keeping, lane departure, parking assistance, blind-spot detection, adaptive cruise control, and related systems.

Warranty Summary: This kit is covered under Zone Off Road's Factory Protection Plus program, which includes ESC system compatibility, a limited lifetime warranty, and a 5-year/60,000-mile drivetrain warranty. Full terms of Zone's warranty program were not otherwise detailed in the supplied source data — confirm complete warranty terms and claim procedures with current Zone Off Road documentation.