Axiom Supply Shock Extension Kit | 2" Front | OE Shocks Only | Excludes AT4X/ZR2 DSSV | 2011-2026 GM 2500HD/3500HD | SKU AXGMSE11
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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 Shock Extension Kit (SKU AXGMSE11) is engineered for 2011–2026 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD trucks (K2XX and T1XX platforms) running leveling kits or lift systems that raise front suspension geometry. Adds 2" to the front shocks, restoring proper suspension travel, preventing clunks, and preserving a smooth ride at the new ride height. High-strength metal construction with corrosion-resistant finish. Direct bolt-on installation, left and right placement. Not adjustable — fixed 2" extension.
Install only on OE or OE-equivalent shocks — not compatible with plus-length aftermarket shocks. Does not fit AT4X or ZR2 model trucks equipped with DSSV shocks.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | AXGMSE11 |
| Brand | Axiom Supply |
| Type | Shock extension kit |
| Front Lift Compatibility | 2" |
| Adjustable | No |
| Construction | High-strength metal, corrosion-resistant finish |
| Shock Compatibility | OE or OE-equivalent shocks ONLY — NOT for plus-length aftermarket shocks |
| Trim Exclusion | Does not fit AT4X or ZR2 models with DSSV shocks |
| Installation | Direct bolt-on, left and right |
| Platform | K2XX (2011–2019) and T1XX (2020–2026) |
| Sold As | Kit |
What Is and Is NOT Included
| Item | Included |
|---|---|
| Shock extension kit (left and right) | ✓ |
| Mounting hardware | ✓ |
| Compatibility with plus-length aftermarket shocks | ✗ NOT included — OE/OE-equivalent shocks only |
| Compatibility with AT4X/ZR2 DSSV shocks | ✗ NOT included — confirmed excluded |
Engine/Trim Breakdown — Confirm Your Exact Configuration
| Vehicle | Engine | Years |
|---|---|---|
| Chevrolet Silverado 2500HD | 6.6L | 2011–2026 |
| GMC Sierra 2500HD | 6.0L | 2011–2019 |
| GMC Sierra 3500HD | 6.0L | 2011–2019 |
| Chevrolet Silverado 3500HD | 6.0L | 2011–2019 |
Some sub-models and engines show a narrower confirmed range than others — confirm your exact configuration before ordering.
Verified Fitment
| Vehicle | Years | Status |
|---|---|---|
| Chevrolet Silverado 2500HD/3500HD | 2011–2026 | ✓ |
| GMC Sierra 2500HD/3500HD | 2011–2026 | ✓ |
| Silverado/Sierra AT4X or ZR2 with DSSV shocks | Any | ✗ Not compatible |
| Silverado/Sierra 2500HD/3500HD | 2010 and earlier | ✗ GMT800/GMT900 — different shock mounting geometry |
| Silverado/Sierra 1500 | Any | ✗ Different platform |
Critical Compatibility
| Configuration | Notes |
|---|---|
| Plus-length aftermarket shocks | NOT supported — installing this extension on a plus-length shock can result in catastrophic parts failure |
| AT4X or ZR2 with DSSV shocks | Not compatible — confirmed exclusion |
| 2010 and earlier GM HD trucks | Does not fit — different shock mounting geometry |
| Aftermarket upper control arms | Recommended pairing for proper alignment geometry |
Common Questions
Does this fit my AT4X?
Not if it's equipped with DSSV shocks — that configuration is confirmed excluded. Confirm your shock type before ordering.
Can I use this with upgraded aftermarket shocks?
Only if they're OE-length or OE-equivalent. This extension is not compatible with plus-length (extended-travel) aftermarket shocks — using it with one can cause catastrophic failure.
Is this adjustable?
No. It's a fixed 2" extension.
Does this fit my 2014 Sierra 3500HD?
Yes, for the 6.0L engine through 2019. Confirm your exact engine and model year, since some configurations have a narrower confirmed range than the full 2011-2026 span.
The Obsidian Take
The AXGMSE11 is for the 2011-2026 Silverado/Sierra 2500HD/3500HD owner installing a leveling kit or lift who wants the front shocks repositioned correctly rather than running them over-extended at full droop. Fixed 2" extension, direct bolt-on, pairs well with aftermarket upper control arms for a complete, properly-geometried setup.
Two checks matter most. First, this is for OE or OE-equivalent shocks only — not compatible with plus-length aftermarket shocks. Second, if you have an AT4X or ZR2 with factory DSSV shocks, this kit doesn't fit your truck at all.
Non-Returnable Notice: Once installed, this kit is non-returnable. Confirm shock type, trim level, and engine/model year before ordering.
⚠️ California Proposition 65 Warning: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. For more information visit P65Warnings.ca.gov.
Manufacturer Data Disclaimer: Specifications sourced from Axiom Supply and authorized distributor documentation. Input data omitted the confirmed AT4X/ZR2 DSSV exclusion and the OE-shocks-only requirement. Obsidian Forged Auto Supply is an authorized Axiom Supply dealer. Manufacturer specifications are subject to change without notice.