Built for Arizona Terrain
3.0L Duramax | BDS Suspension | 35” Trail Setup
Purpose-Built AT4 Transformation. This 2021 GMC Sierra AT4 was transformed into a refined off-road capable diesel setup without sacrificing daily drivability or factory comfort. Built around a BDS 2.5” coilover suspension system and 35” all-terrain tires, this AT4 delivers improved stance, enhanced trail performance, and a more aggressive road presence while maintaining GMC’s premium ride quality.
Powered by the 3.0L Duramax diesel and paired with a precision-tuned suspension upgrade, this build is engineered for control, capability, and confidence whether on Arizona highways or off-grid terrain.
Build Specifications
Lifted Clean. Trail Mean.
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Suspension: BDS 2.5” coilover lift system for improved stance, articulation, and ride control
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Tires: 35” Toyo Open Country R/T Trail for aggressive traction and durability
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Wheels: Factory 20” GMC wheels retained for OEM-plus appearance and strength
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Specifications: Professional alignment, suspension tuning, and precision installation for balanced drivability
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Built for Control. Tuned for Comfort.
A premium BDS 2.5” coilover suspension system elevates both capability and ride quality, giving this AT4 improved ground clearance, damping control, and off-road articulation without compromising highway comfort.
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BDS788FPE 2.5” coilover lift system
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Front coilovers with DSC adjustment
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Rear shocks with DSC tuning
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Engineered for 2019–2023 GMC AT4 1500 4WD
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Professional installation + alignment included
Result:
A smoother, more controlled ride with serious off-road capability and factory-level comfort retention.
Aggressive Stance. Trail-Ready Grip.
This setup combines OEM GMC wheel strength with 35” Toyo Open Country R/T Trail tires, delivering the perfect balance of daily drivability and off-road aggression.
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20” factory GMC wheels retained
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35x12.50R20LT Toyo Open Country R/T Trail tires
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Load range E durability for heavy-duty use
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Balanced mount and machine installation
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Optimized for highway + dirt performance
Result:
A wider stance, improved ground contact, and confident traction across all terrain types.
More Than Just a Lift Kit
Clean Integration. Built for Function.
Every supporting detail of this build was installed with purpose, ensuring reliability and long-term performance.
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2021 GMC Sierra K1500 AT4
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3.0L Duramax I6 Diesel Engine
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10-speed automatic transmission
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BDS 2.5” coilover suspension system (front + rear DSC)
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35x12.50R20LT Toyo Open Country R/T Trail tires
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Factory 20” GMC wheels retained
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Professional installation + alignment
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Off-road tuned suspension geometry
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Daily drivability preserved
Result:
A dialed-in setup that feels factory-refined but performs far beyond stock limits.
This GMC Sierra AT4 build combines diesel torque with a premium suspension system and aggressive tire package to create a refined off-road platform built for real-world performance. Designed for drivers who want capability without sacrificing comfort, this setup enhances stance, traction, and control across all environments.
Final Result:
A factory-plus AT4 that delivers diesel power, elevated stance, and true all-terrain confidence.
Upgrade Your Truck Today
Contact BDM Customs today to discuss your build goals and create a truck that's built around how you work, drive, and explore.
Lift & Leveling Kits
Raise your truck’s stance
Wheels & Tires
Custom wheels and tires
Lighting & Visibility
Safety & performance
Performance Upgrades
Boost power and efficiency
WHY CHOOSE BDM CUSTOMS
Quality Parts That Last
We only use proven brands known for durability and performance—parts built to handle real-world driving and off-road abuse. Every component is selected to ensure your lift kit lasts through tough trails, daily driving, and everything in between.
Built for Real Performance
Our lift kits don’t just look aggressive—they’re engineered to improve clearance, capability, and overall vehicle performance. Whether it’s off-road terrain, larger tires, or extreme payloads, your truck handles it with confidence.
Customized for Your Build
No two vehicles are the same, and neither are their owners. We help you choose the right lift height, components, and setup to match your driving style, vehicle type, and personal preferences—so your build is truly yours.
Installed the Right Way
Proper installation matters. Our skilled technicians focus on correct geometry, alignment, and long-term reliability. Every bolt, shock, and control arm is installed with precision, ensuring your vehicle drives safely and performs as it should.
Aggressive Look, Done Right
A lift should transform your vehicle visually as well as functionally. We dial in the stance, tire fitment, and overall look so your truck commands attention while staying balanced, street-legal, and off-road-ready.
