Axiom Supply Upper Control Arm Bushing Kit | For Aftermarket UCAs Only (Cognito, Kryptonite, Axiom) | 2011-2026 GM 2500HD/3500HD | SKU AXGMUCAB11
Couldn't load pickup availability
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 Upper Control Arm Bushing Kit (SKU AXGMUCAB11) is a precision replacement bushing kit for aftermarket upper control arms on 2011–2026 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD trucks (K2XX and T1XX platforms). This kit is compatible only with aftermarket upper control arms from Cognito Motorsports, Kryptonite Products, and Axiom Supply — it is not a fitment for factory/OEM upper control arms. Worn bushings in aftermarket UCAs cause front-end clunking, steering wander, uneven tire wear, and inconsistent alignment. This kit restores precise control arm pivot movement, improving ride quality and handling predictability under towing, hauling, and off-road loads. Comes as a complete set for a full front-end refresh. Lifetime warranty to the original purchaser. Front-end alignment is mandatory after installation.
Component Specifications
| Spec | Detail |
|---|---|
| SKU / Part Number | AXGMUCAB11 |
| Brand | Axiom Supply |
| Type | Upper control arm bushing kit |
| Compatible With | Aftermarket UCAs from Cognito Motorsports, Kryptonite Products, and Axiom Supply ONLY |
| NOT Compatible With | Factory/OEM upper control arms |
| Quantity | Complete set — covers both sides |
| Warranty | Lifetime — original purchaser |
| Price | $56.99 |
| Application | Aftermarket front suspension rebuild — towing, hauling, daily driving, off-road |
| Sold As | Complete kit |
What Is and Is NOT Included
| Item | Included |
|---|---|
| Complete UCA bushing kit (both sides) | ✓ |
| Compatibility with factory/OEM upper control arms | ✗ NOT included — this kit is for aftermarket UCAs only |
| Hydraulic press / bushing press tool | ✗ NOT included — required for proper installation |
GM HD UCA Bushing Platform Guide
| Platform | Years | Compatible Aftermarket UCA Brands |
|---|---|---|
| GMT800/GMT900 | 2001–2010 | Cognito Motorsports, Kryptonite Products, Axiom Supply — confirm correct SKU with us |
| K2XX/T1XX (this listing) | 2011–2026 | Cognito Motorsports, Kryptonite Products, Axiom Supply |
Symptoms of Worn Upper Control Arm Bushings
- Clunking or knocking from the front suspension over bumps or during steering input
- Steering wander or vague on-center feel
- Uneven or accelerated front tire wear
- Alignment that cannot be held or drifts after service
- Visible cracking, tearing, or separation of the bushing material on inspection
Installation Notes
- Alignment mandatory. Full front-end alignment (caster, camber, toe) is required after UCA bushing replacement. Bushing replacement changes the control arm pivot geometry — do not drive until aligned by a qualified technician.
- Replace in pairs. Replace UCA bushings on both sides simultaneously. Mismatched bushing condition causes unequal suspension compliance and inconsistent handling.
- Torque at ride height. Final torque on UCA bushing hardware must be applied with the suspension loaded at ride height — not at full droop.
- Press-fit installation. UCA bushings are pressed into the control arm housing. A hydraulic press or bushing press tool is required. Do not drive bushings in with a hammer.
- Inspect UCA shell. Inspect the aftermarket upper control arm housing for cracks, corrosion, or deformation before installing new bushings.
- Torque specs. Torque UCA pivot hardware to OEM specification for 2011-2026 GM 2500HD/3500HD K2XX/T1XX.
Verified Fitment
| Vehicle | Years | UCA Requirement | Status |
|---|---|---|---|
| Chevrolet Silverado 2500HD/3500HD | 2011–2026 | Aftermarket Cognito, Kryptonite, or Axiom UCA installed | ✓ |
| GMC Sierra 2500HD/3500HD | 2011–2026 | Aftermarket Cognito, Kryptonite, or Axiom UCA installed | ✓ |
| Silverado/Sierra 2500HD/3500HD with factory UCAs | 2011–2026 | Factory/OEM | ✗ Not compatible |
| Silverado/Sierra 2500HD/3500HD | 2010 and earlier | Any | ✗ Different platform — confirm the correct earlier-generation kit |
| Silverado/Sierra 1500 | Any | Any | ✗ Different UCA geometry |
Critical Compatibility
| Configuration | Notes |
|---|---|
| Factory/OEM upper control arms | NOT compatible — this kit only fits aftermarket UCAs from Cognito Motorsports, Kryptonite Products, or Axiom Supply |
| 2010 and earlier GM HD trucks | Does not fit — confirm the correct earlier-generation kit |
| Torquing at full droop | Preloads the bushing and causes premature failure — torque only at ride height |
| Hammer installation | Will cause uneven seating and premature wear — a hydraulic press is required |
Common Questions
Will this fit my factory upper control arms?
No. This kit only fits aftermarket upper control arms from Cognito Motorsports, Kryptonite Products, or Axiom Supply. If you're running factory/OEM control arms, this kit will not work.
I have a Kryptonite UCA — will this fit?
Yes, confirmed compatible.
Do I need a press to install this?
Yes. UCA bushings are press-fit into the control arm housing — a hydraulic press or bushing press tool is required. Do not attempt installation with a hammer.
Do I need an alignment after installing this?
Yes, mandatory. Bushing replacement changes control arm pivot geometry — do not drive until a full front-end alignment is completed.
The Obsidian Take
The AXGMUCAB11 is for the 2011-2026 Silverado/Sierra 2500HD/3500HD owner running an aftermarket Cognito, Kryptonite, or Axiom upper control arm whose bushings have worn out and need replacing — not a fix for factory control arm clunking.
The check that matters most before ordering: confirm you actually have an aftermarket UCA installed, and that it's from one of these three specific brands. This kit was never designed to fit the factory control arm at all.
Non-Returnable Notice: Once installed, this kit is non-returnable. Confirm your control arm brand and 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. Input data did not state the confirmed restriction to aftermarket Cognito Motorsports, Kryptonite Products, and Axiom Supply upper control arms only. Obsidian Forged Auto Supply is an authorized Axiom Supply dealer. Manufacturer specifications are subject to change without notice.