Axiom Supply Stage 1 Leveling Kit | Torsion Keys + Shock Extenders | 2" Front Lift | 2011-2019 Chevy Silverado/GMC Sierra 2500HD & 3500HD K2XX | SKU AXGM11STAGE1
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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 Stage 1 Leveling Kit (SKU AXGM11STAGE1) is a complete front leveling system for 2011–2019 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD trucks (K2XX coil spring platform). The factory GM HD front end sits lower than the rear by design; this kit raises the front to eliminate factory rake, creating a level stance and improving clearance for larger tires. Forged torsion keys paired with matched shock extenders achieve a true 2" front lift while maintaining factory ride quality. Engineered specifically for the K2XX coil spring front suspension geometry. Direct bolt-on installation. Front-end alignment is mandatory after installation.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | AXGM11STAGE1 |
| Brand | Axiom Supply |
| Type | Stage 1 front leveling kit — torsion keys + shock extenders, bundled |
| Front Lift | Up to 2" |
| Platform | K2XX coil spring front suspension |
| Recommended Pairing | Aftermarket upper control arms and compatible shocks |
| Application | Daily driving, towing, hauling, light off-road |
| Installation | Direct bolt-on |
| Sold As | Complete kit |
What Is and Is NOT Included
| Item | Included |
|---|---|
| Forged torsion keys | ✓ |
| Matched shock extenders | ✓ |
| Upper control arms | ✗ NOT included — recommended pairing, sold separately |
| Aftermarket performance shocks | ✗ NOT included — sold separately if upgrading beyond stock |
GM Leveling Kit Platform Guide
| Platform | Years | SKU |
|---|---|---|
| GMT800 torsion bar 6-lug (1500) | 1999–2006 | AXGM99STAGE1 |
| GMT900/K2XX coil spring strut (1500) | 2007–2018 | AXGM07STAGE1 |
| K2XX (2500HD/3500HD) (this listing) | 2011–2019 | AXGM11STAGE1 |
| T1XX (2500HD/3500HD) | 2020–2026 | AXGM20STAGE1 |
Installation Notes
- Alignment mandatory. A full front-end alignment (caster, camber, toe) is required after installation. Do not drive beyond a short test drive until aligned.
- Platform confirmation required. Confirm your truck is 2011-2019 K2XX before ordering. The 2020 Silverado/Sierra 2500HD/3500HD is T1XX, not K2XX, and requires AXGM20STAGE1 instead.
- Pair with upper control arms. Pairing the keys with a premium aftermarket upper control arm kit and compatible shocks delivers optimal performance, superior alignment, and a smooth ride.
- Tire clearance verification. If upsizing tires, verify clearance at full lock and full compression after installation.
- Torque specs. Torque all hardware to OEM specification for 2011–2019 GM 2500HD/3500HD K2XX.
- Re-torque. Re-torque all hardware after the first 500 miles of driving.
Verified Fitment
| Vehicle | Years | Status |
|---|---|---|
| Chevrolet Silverado 2500HD/3500HD | 2011–2019 | ✓ — K2XX coil spring |
| GMC Sierra 2500HD/3500HD | 2011–2019 | ✓ — K2XX coil spring |
| Silverado/Sierra 2500HD/3500HD | 2020 and newer | ✗ T1XX platform — order AXGM20STAGE1 |
| Silverado/Sierra 2500HD/3500HD | 2010 and earlier | ✗ Different platform — confirm correct kit |
| Silverado/Sierra 1500 | Any | ✗ Different platform — see AXGM07STAGE1 or AXGM99STAGE1 |
Critical Compatibility
| Configuration | Notes |
|---|---|
| 2020 and newer GM HD trucks | Does not fit — T1XX platform, order AXGM20STAGE1 |
| 2010 and earlier GM HD trucks | Does not fit — confirm the correct earlier-generation kit |
| GM 1500 | Does not fit — different platform entirely |
| Aftermarket upper control arms | Recommended pairing for optimal performance, superior alignment, and smooth ride |
Common Questions
Is my 2020 Sierra 2500HD covered by this kit?
No. The 2020 model year is T1XX, not K2XX, and requires AXGM20STAGE1 instead.
Does this include the shock extenders, or do I need to buy them separately?
Included. This Stage 1 kit bundles forged torsion keys with matched shock extenders in one purchase.
Do I need an alignment after installing this?
Yes, mandatory. Do not drive beyond a short test drive until a full front-end alignment is completed.
Does this fit my 2010 Silverado 2500HD?
No. The 2010 and earlier generation uses a different front suspension platform — confirm the correct earlier-generation kit before ordering.
The Obsidian Take
The AXGM11STAGE1 is for the 2011-2019 Silverado/Sierra 2500HD/3500HD owner who wants a complete, bundled leveling solution for the K2XX platform — forged torsion keys and matched shock extenders engineered together, achieving a true 2" front lift while maintaining factory ride quality.
Pair with a premium aftermarket upper control arm kit and compatible shocks for the best alignment range and stability, and confirm your exact model year — the 2020 truck looks similar but uses the newer T1XX platform and needs a different kit entirely.
Non-Returnable Notice: Once installed, this kit is non-returnable. Confirm platform generation before ordering. A full front-end alignment is required after installation.
Manufacturer Data Disclaimer: Specifications sourced from Axiom Supply and authorized distributor documentation, consistent with the closely related Kryptonite equivalent product for this platform. Obsidian Forged Auto Supply is an authorized Axiom Supply dealer. Manufacturer specifications are subject to change without notice.