Rough Country · Authorized Dealer
6 Inch Lift Kit | Mono Leaf Rear | Diesel | Gmc Sierra 1500 2wd/4wd (25-26)
$1,299.95
Price does not include installation.
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$1,299.95
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🛠️ Install available in Marietta, GA
Installed and serviced at Road Runner Wheels & Tires — 1585 Roswell Rd, Marietta, GA 30062. Call (678) 400-6467 to schedule.
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Built for GMC Sierra 1500 owners who want commanding ground clearance without sacrificing ride quality, this 6-inch lift kit combines steel knuckles, differential brackets, and a drop crossmember to preserve factory suspension geometry while gaining significant height. You'll run 35" tires comfortably and maintain the handling characteristics Rough Country engineered in.
Installed and serviced at Road Runner Wheels & Tires. Most lift kits go in the same day. Call (678) 400-6467 to schedule.
What's included
- Universal Kit Box (Mono Leaf Rear) — rear suspension foundation with mono-leaf design for clean lines and reliable support.
- 6" Driver Knuckle Box — precision-cast knuckle for the driver side, engineered to reduce CV angles and maintain factory geometry.
- 6" Passenger Knuckle Box — matching passenger-side knuckle maintaining suspension balance and alignment.
- Diesel 6" Front Kit Box — diesel-rated front suspension components with reinforced geometry correction and strut spacers.
- 6" Crossmember Box — drop-design crossmember that lowers the front differential mount to preserve suspension angles while gaining lift height.
- 6" Front Kit Box — additional front suspension hardware ensuring complete coverage for your Sierra.
- N3 Shock Pair — nitrogen-charged shocks tuned for the 6-inch lift height, delivering responsive damping and durability.
Important notes
- Requires cutting and drilling during installation.
- Does NOT fit Denali or Denali Ultimate models equipped with Adaptive Ride Control.
- Does NOT fit AT4 or AT4X models — these come with factory 2-inch lifts and incompatible damper systems (Multimatic DSSV on AT4X).
- Does NOT fit factory wheels — 20-inch or larger aftermarket wheels required.
- Wheels must feature 4.5" backspacing minimum. Some setups may need a 0.25" wheel spacer (#1065).
- Test fit your wheels prior to final installation to confirm clearance.
Why customers pick this at Road Runner
- Geometry-corrected design — steel knuckles and drop crossmember keep suspension angles factory-close, preserving ride quality and handling.
- Professional installation by Rough Country specialists who perform these lifts weekly, plus in-house alignment after every install.
- Rough Country's limited lifetime warranty backed locally — no mail-in hassles, service it here.
- Tire clearance validated for 35" rubber without cutting fenders or trimming interior.
- One-stop shop — we handle geometry correction, alignment, and wheel fitment testing in-house.
Ready to build it? Call (678) 400-6467. Hablamos Español.
| Qty | Part | Part # |
|---|---|---|
| 1 | Universal Kit Box | Mono Leaf Rear | Chevy Silverado 1500 (19-23) GMC Sierra 1500 (19-23) | 21630991 |
| 1 | 6in Kit Crossmember Box | Chevy Silverado 1500 (19-23) Chevy Suburban 1500 (2021) | 217BOX11 |
| 1 | Diesel 6in FR Kit Box | Chevy Silverado 1500 (19-23) GMC Sierra 1500 (19-23) | 217BOX10 |
| 1 | 6in FR Kit Box | GMC Sierra 1500 (19-23) | 217BOX8 |
| 1 | N3 Shock Pair | 23158 |
| 1 | 6in Kit Dr Knuckle Box | Chevy Silverado 1500 (19-23) Chevy Suburban 1500 (2021) | 21730BOX5 |
| 1 | 6in Kit Ps Knuckle Box | Chevy Silverado 1500 (19-23) Chevy Suburban 1500 (2021) | 21730BOX6 |
Features
- Enhanced Stance: Lifts and levels your vehicle from front to rear for a commanding presence.
- Optimized Suspension: High-clearance crossmember design maintains ideal suspension geometry for superior handling.
- Extreme Durability: Includes heavy-duty cast knuckles built to withstand rugged terrain.
- Factory Fitment: Retains stock track width for proper wheel alignment and stability.
- Precision Engineering: 100% laser-cut materials using advanced CAD technology for a perfect fit.
- Built to Last: Heavy-duty fabricated blocks offer superior strength and longevity over cast alternatives.
| Years | Make | Model | Drive |
|---|---|---|---|
| 2025-2026 | GMC | Sierra 1500 Elevation | 4WD |
| 2025-2026 | GMC | Sierra 1500 Pro | 4WD |
| 2025-2026 | GMC | Sierra 1500 SLE | 4WD |
| 2025-2026 | GMC | Sierra 1500 SLT | 4WD |
- Tire size: 35″ to 37″ tall
- Lift height: 6″
Requires cutting and drilling. Does NOT fit Denali or Denali Ultimate models with as they are equipped with Adaptive Ride Control. Does NOT fit AT4 models as it is equipped with a 2-inch factory lift. Does NOT fit AT4X models as it is equipped with a 2-inch factory lift and Multimatic DSSV dampers. Tire & Wheel Details Does NOT fit factory wheels. 20-inch or larger aftermarket wheels are required. Wheels must feature 4.5in backspacing to fit. Please test fit wheels prior to installation. Some aftermarket wheels may require 0.25" wheel spacer #1065.
Rough Country Lifetime Replacement Warranty covers all structural components against defects in materials and workmanship for the original purchaser's lifetime ownership of the vehicle.
3-Year Finish Warranty on all painted and powder-coated surfaces.
3-Year Shock Warranty on N3, M1, and Vertex shocks against leakage and structural failure.
Warranty service is handled by Rough Country directly — call (678) 400-6467 if you need help opening a warranty claim and we'll walk you through it.
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