Zone Offroad F112F Lift Kit — 6" Front / 4" Rear | AAL + Fox Adventure Shocks | 2017–2019 Ford F-250 / F-350 4WD | Gas Engine Only | 2-Leaf Main Spring Pack Only
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Before ordering, verify your vehicle details, current setup, and SKU with OFAS fitment support so your upgrade matches your build.
Shipping & Delivery
Free shipping is available within the lower 48 U.S. states. Large or heavy items may ship by freight, and delivery timing can vary by warehouse, carrier, and product availability.
Fitment, Shipping & Product Support
Two fitment gates. Both must be confirmed. Add-a-leaf included. Fox Adventure shocks front and rear.
Before ordering — confirm your engine and count your rear leaf springs. The F112F fits the 2017–2019 F-250 and F-350 4WD with a gas engine and a 2-leaf main spring pack. Miss either gate and you're ordering the wrong kit.
The Zone Offroad F112F delivers 6 inches of front lift and 4 inches of rear lift on the 2017–2019 Super Duty IFS platform. Heavy-duty crossmembers and steering knuckles correct caster, camber, and scrub radius geometry at lifted height. The rear lift uses an add-a-leaf combined with a 4-inch block — the AAL increases spring rate and load capacity while reducing axle wrap risk that a block-only solution at this height introduces. Fox Adventure Series shocks valved for the lifted Super Duty geometry are included front and rear. Running a 3-leaf spring pack instead? Order F113F.
| Spec | Detail |
|---|---|
| SKU | F112F |
| Brand | Zone Offroad |
| Platform | 2017–2019 Ford F-250 / F-350 4WD — IFS platform |
| Front lift | 6 inches |
| Rear lift | 4 inches — add-a-leaf + 4-inch block spacer |
| Shock type | Fox Adventure Series — front and rear, valved for lifted geometry |
| Engine | Gas only — does NOT fit 6.7L Powerstroke or any diesel |
| Spring pack | 2-leaf main spring pack ONLY — does not fit 4-leaf or other configurations |
| Rear suspension | Leaf spring — add-a-leaf + 4-inch block |
| Drivetrain | 4WD only |
| Shipping weight | 225 lbs — LTL freight, residential delivery included |
| Nitro shock alternative | F112N — same kit, Nitro shocks at lower price point |
| 3-leaf spring pack alternative | F113F (Fox) / F113N (Nitro) — 3-inch rear block, no AAL required |
| Alignment required | Yes — full 4-wheel alignment mandatory post-installation |
| Re-torque required | Yes — all suspension fasteners after 500 miles of break-in |
| Install difficulty | Professional installation required |
Why the add-a-leaf matters on a 2-leaf pack — and why you need to count before ordering:
| Kit | Spring Pack | Rear Setup | Rear Lift | AAL |
|---|---|---|---|---|
| F112F (this kit) | 2-leaf main | AAL + 4" block | 4" | Included — required |
| F113F | 3-leaf main | 3" block only | 3" | Not required |
The 2-leaf main spring pack does not provide sufficient axle wrap resistance at 4 inches of block height without additional spring support. The add-a-leaf increases the spring rate and load capacity of the 2-leaf pack — reducing axle wrap risk under hard acceleration and heavy towing. Installing a block-only solution on a 2-leaf pack at this height introduces real axle wrap risk. The F112F's AAL-plus-block approach is the correct rear lift method for the 2-leaf platform.
Kit contents:
- Heavy-duty front crossmembers
- Steering knuckles
- Strut spacers
- Differential drop brackets
- Add-a-leaf (AAL)
- 4-inch rear block spacer
- Fox Adventure Series shocks — front and rear
- All required hardware
✅ This kit fits — two gates, both required
| Vehicle | Engine | Drivetrain | Spring Pack | Years |
|---|---|---|---|---|
| Ford F-250 Super Duty SRW | Gas only | 4WD | 2-leaf main | 2017–2019 |
| Ford F-350 Super Duty SRW | Gas only | 4WD | 2-leaf main | 2017–2019 |
❌ This kit does NOT fit — read before ordering
| Vehicle / Configuration | Reason | Correct Kit |
|---|---|---|
| F-250 / F-350 with 6.7L Powerstroke diesel | Gas engine only | — |
| F-250 / F-350 with 4-leaf or non-standard spring pack | 2-leaf main only — other configurations not confirmed | — |
| F-250 / F-350 with 3-leaf main spring pack | Different rear lift configuration required | F113F (Fox) / F113N (Nitro) |
| F-250 / F-350 2WD / RWD | 4WD IFS platform only | — |
| 2016 and earlier Ford Super Duty | Different generation platform | — |
| 2020 and newer Ford Super Duty | Different generation platform | — |
| Ford F-350 DRW (Dually) | Confirm separately before ordering | — |
| Ford F-150 | Incompatible platform | — |
Engine: Gas engine only. The 6.7L Powerstroke diesel and all diesel configurations are not compatible. Check your door jamb sticker or window sticker for your engine code before ordering.
Spring pack: Count your rear leaf springs before ordering — do not guess. Two leaves in the main stack — this kit. Three leaves — order F113F or F113N. A 4-leaf or non-standard configuration requires separate confirmation before ordering.
⚠️ 2020+ Super Duty owners: The 2020 Super Duty is a different generation platform. This kit does not fit — text (469) 407-7538 with your year and we'll point you to the correct kit.
⚠️ F-350 DRW owners: Dually fitment requires separate confirmation. Text (469) 407-7538 before ordering.
Before You Buy — Questions We Get Asked
Q: What's the difference between F112F and F112N?
Same kit — same heavy-duty crossmembers, steering knuckles, strut spacers, differential drop brackets, AAL, and 4-inch rear block. Same 2-leaf spring pack requirement and gas-only restriction. The only difference is the shock package. F112F includes Fox Adventure Series shocks — premium damping and improved consistency across uneven terrain. F112N includes Nitro gas shocks at the lower price point. Same geometry correction. Choose based on shock preference and budget.
Q: What's the difference between F112F and F113F?
Both cover the same 2017–2019 4WD gas platform at 6 inches of front lift with Fox Adventure shocks. F112F is for trucks with a 2-leaf main spring pack — it includes an add-a-leaf and a 4-inch rear block because the 2-leaf pack needs the additional spring support at that block height. F113F is for trucks with a 3-leaf main spring pack — the 3-leaf pack provides sufficient support at 3 inches of block height without an AAL. Count your leaves before ordering — the rear lift configuration is determined by your factory spring pack, not your preference.
Q: How do I count my rear leaf springs correctly?
Get under the rear of the truck and count the steel leaf springs in the main spring pack. Do not count any overload springs that sit above the main pack with a visible gap — count only the leaves in the main stack that are in full contact with each other. Two leaves — order F112F. Three leaves — order F113F. If your count doesn't match either, text (469) 407-7538 with your year, trim, and any tow package codes before ordering.
Q: How does this ship and what do I need to know?
This kit ships via LTL freight carrier at 225 lbs. Residential delivery is included — the freight carrier will contact you to schedule a delivery window. Professional installation is required. Budget for a full 4-wheel alignment at the time of install and a re-torque appointment at 500 miles.
The Obsidian Take
The F112F is for the 2017–2019 Super Duty gas owner with a 2-leaf main spring pack who wants 6 inches of front lift and 4 inches of rear lift with Fox Adventure Series shocks doing the dampening. The add-a-leaf is not an optional upgrade on this kit — it is the required rear configuration for the 2-leaf pack at 4 inches of block height. Without it, axle wrap risk under hard acceleration and towing loads is real. Zone Offroad's AAL-plus-block approach correctly addresses the 2-leaf pack's spring rate limitations at this rear lift height. Fox Adventure Series shocks valved for the lifted Super Duty geometry deliver more consistent damping than the Nitro alternative across uneven terrain. Heavy-duty crossmembers and steering knuckles correct caster, camber, and scrub radius simultaneously at 6 inches of front lift.
This kit is not for diesel owners — gas engine only, confirmed before anything else. It is not for trucks with a 3-leaf main spring pack — the correct configuration for 3-leaf is F113F or F113N. It is not for 4-leaf or non-standard spring pack trucks — contact us to confirm. It is not for 2016 or earlier Super Duty owners. It is not for 2020 or newer Super Duty owners. F-350 DRW owners need to confirm separately. If Nitro shocks at a lower price point are acceptable, order F112N instead. Count your rear leaf springs before you check out — that's the gate that most people skip.
Product information is compiled from manufacturer-provided data. Obsidian Forged Auto Supply is not responsible for manufacturer-driven specification updates, metadata changes, or accuracy discrepancies in the foundational data sheets.
⚠️ LTL Freight Notice: This item ships via freight carrier due to size and weight. Residential delivery is included. Freight carrier will contact you to schedule delivery.
2017–2019 Ford F-250 / F-350 4WD. Gas engine only — diesel does not fit. 2-leaf main spring pack only — 3-leaf owners order F113F. Nitro shocks instead — order F112N.