Axiom Supply 2° Caster Shim Set | Fixed-Wedge | Gold Zinc Steel | 4WD Only | 2005-2026 Ford F-250/F-350 Super Duty | SKU AX3228
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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
The Axiom Supply 2° Caster Shim Set (SKU AX3228) restores front-end caster geometry on 2005–2026 Ford F-250 and F-350 Super Duty 4WD trucks after installing a 2"–2.5" leveling kit or lift. When the front suspension is raised in this range, caster is reduced by approximately 1° — causing steering wander, poor straight-line stability, and inconsistent return-to-center feel, especially with larger tires. This fixed-wedge shim set installs between the leaf spring and axle perch, restoring positive caster and adding roughly 1° above factory spec for improved tracking. Built from heavy-duty steel with a corrosion-resistant gold zinc coating — resists cracking under a diesel engine's weight and won't slip out of alignment over rough roads. Sold as a pair. This is not a full leveling kit — it corrects caster after a separate leveling kit or lift is already installed. Covers P221 (2005–2016), P558 (2017–2022), and P702 (2023–2026) Super Duty generations under one part number. 4WD only. Front-end alignment is mandatory after installation.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | AX3228 |
| Brand | Axiom Supply |
| Type | Fixed-wedge caster correction shim set |
| Correction | 2° positive caster (restores ~1° lost + adds ~1° above stock at 2"-2.5" lift) |
| Designed For | 2"–2.5" front leveling kits/lifts specifically |
| Installation | Between leaf spring and front axle perch |
| Construction | Heavy-duty steel, gold zinc coating — corrosion-resistant |
| Price | $49.99 |
| Drivetrain | 4WD only |
| Sold As | Pair |
| Note | Not a full leveling kit — corrects caster after a separate lift/leveling kit is installed |
What Is and Is NOT Included
| Item | Included |
|---|---|
| 2° fixed-wedge caster shim pair | ✓ |
| Leveling kit or lift components | ✗ NOT included — this corrects caster after a separate lift/leveling kit is already installed |
| Front-end alignment service | ✗ NOT included — mandatory after installation, performed by a qualified shop |
When to Use Caster Shims
- After installing a front leveling kit or coil spacer in the 2"–2.5" range
- When the truck wanders, pulls, or has poor straight-line stability after a front lift
- When an alignment technician cannot achieve factory caster spec after a lift
- Especially beneficial when running larger, more aggressive tires that amplify steering wander from reduced caster
Verified Fitment
| Vehicle | Years | Generation | Status |
|---|---|---|---|
| Ford F-250 Super Duty 4WD | 2005–2016 | P221 | ✓ |
| Ford F-250 Super Duty 4WD | 2017–2022 | P558 | ✓ |
| Ford F-250 Super Duty 4WD | 2023–2026 | P702 | ✓ |
| Ford F-350 Super Duty 4WD | 2005–2016 | P221 | ✓ |
| Ford F-350 Super Duty 4WD | 2017–2022 | P558 | ✓ |
| Ford F-350 Super Duty 4WD | 2023–2026 | P702 | ✓ |
| Super Duty 2WD | Any | Any | ✗ No solid front axle leaf spring perch |
| Ford F-450/F-550 | Any | Any | ✗ Not compatible |
| Ford F-150 | Any | Any | ✗ Independent front suspension — no leaf spring perch |
| Super Duty | 2004 and earlier | Any | ✗ Different front axle geometry |
Critical Compatibility
| Configuration | Notes |
|---|---|
| 2WD Super Duty | Not compatible — front suspension geometry is different, no leaf spring perch |
| Lift heights outside the 2"–2.5" range | Confirm with an alignment technician whether this fixed 2° shim is still the correct correction — it was specifically engineered for the 2"-2.5" lift range |
| Loose U-bolt hardware | Re-torque after the first 500 miles — loose U-bolts can allow axle rotation and sudden caster change |
| No alignment after install | Do not drive until a full front-end alignment is completed |
Common Questions
Is this a full leveling kit?
No. This shim set only corrects caster geometry after you've already installed a separate leveling kit or lift in the 2"-2.5" range. It does not raise the truck on its own.
Will this work for any lift height?
It's specifically engineered for the 2"-2.5" leveling range, where caster loss is about 1° and this 2° shim restores that loss while adding roughly 1° above stock for better tracking with larger tires. For other lift heights, confirm the correct caster correction with your alignment technician before ordering.
Do I need an alignment after installing this?
Yes, mandatory. Do not drive the vehicle until a full front-end alignment (caster, camber, toe) is completed.
Does this fit my 2024 F-350?
Yes — this single part number covers the P221, P558, and P702 generations spanning 2005-2026.
The Obsidian Take
The AX3228 is for the 2005-2026 Super Duty 4WD owner who's leveled or lifted their truck 2"-2.5" and is now dealing with steering wander or poor tracking — especially common with larger tires. Heavy-duty gold zinc steel, fixed-wedge design that won't crack or slip under a diesel's weight, installs between the leaf spring and axle perch.
The key thing to understand: this is a fixed 2° correction engineered for that specific 2"-2.5" lift range, not a one-size-fits-all shim for any lift height. If your lift falls outside that range, confirm the right caster correction with an alignment technician before ordering.
Non-Returnable Notice: Once installed, this kit is non-returnable. A full front-end alignment is required after installation — do not drive until completed.
Manufacturer Data Disclaimer: Specifications sourced from Axiom Supply and authorized distributor documentation. Input data presented a variable caster-correction guide not supported by Axiom's own product description, which sells this as a single fixed 2° shim engineered for the 2"-2.5" lift range. Obsidian Forged Auto Supply is an authorized Axiom Supply dealer. Manufacturer specifications are subject to change without notice.