6 Inch Rear Lowering Kit (Axle Flip Kit)

Transform the stance, performance, and drivability of your full-size GM truck with the 1999–2006 Chevy Silverado / GMC Sierra 2WD & 4WD – 6 Inch Rear Lowering Kit. This complete rear axle flip kit is engineered to deliver a dramatic six-inch drop while preserving proper suspension geometry, correct driveline angles, and dependable ride quality. Whether you’re building a slammed street truck, a clean daily driver, or a show-quality custom pickup, this kit provides the perfect foundation for an aggressive lowered stance without sacrificing safety or reliability.

Designed specifically for 1999–2006 Silverado and Sierra 1500 trucks, this professional-grade lowering system relocates the rear axle above the leaf springs to achieve a true six-inch rear drop. The kit includes heavy-duty flip brackets with fully adjustable pinion angle, precision-engineered C-notch brackets, new U-bolts and spring plates, integrated bump stops, and all required hardware for a complete and secure installation.

This is not a partial kit or a shortcut solution. Every critical component required to properly flip the axle, correct driveline geometry, and allow safe suspension travel is included — except rear shocks, which must be purchased separately to match your application.

Engineered for 1999–2006 Chevy Silverado & GMC Sierra Trucks

This rear lowering kit is designed to fit:

• 1999–2006 Chevy Silverado 1500

• 1999–2006 GMC Sierra 1500

• Works with both 2WD and 4WD configurations

Your factory rear suspension uses staggered shock mounts, with one shock positioned in front of the rear axle and the other behind it. This kit is engineered to work seamlessly with that factory layout and includes a passenger-side shock extender to maintain proper shock length and travel after the axle flip.

Why an Axle Flip Kit Is the Best Way to Achieve a 6-Inch Rear Drop

On stock GM leaf-spring rear suspensions, the rear axle is mounted underneath the leaf springs. A properly designed axle flip kit relocates the axle to the top of the leaf springs, instantly creating a drop of approximately five to six inches.

This method offers several advantages over lowering shackles, hangers, or blocks:

• Maintains full leaf spring functionality

• Preserves correct suspension geometry

• Improves axle control and traction

• Eliminates stacking blocks or overstressing components

• Provides the cleanest and strongest way to achieve large rear drops

This kit goes beyond a basic flip by including adjustable pinion angle brackets, allowing you to fine-tune driveline alignment for smooth, vibration-free performance.

Complete Kit Contents – Built for a Proper, Safe Installation

This is a true complete 6-inch rear axle flip kit, designed to deliver professional-level results with no missing components.

Included components:

• Heavy-duty rear axle flip brackets with fully adjustable pinion angle

• Precision-cut C-notch frame brackets for axle clearance

• New high-strength U-bolts

• Reinforced spring plates

• Integrated rear bump stops

• Passenger-side shock extender

• Complete installation hardware pack (grade-8 bolts, washers, and locking nuts)

Rear shocks are NOT included

DJM recommends the following rear shock part numbers:

• Driver Side Rear Shock: DJM 1800 (sold individually)

• Passenger Side Rear Shock: DJM 1900 (sold individually)

The included shock extender is designed specifically for the passenger side to accommodate the factory staggered shock configuration.

Fully Adjustable Pinion Angle – Protect Your Drivetrain

Lowering the rear of your truck by six inches significantly changes the relationship between the driveshaft, transmission, and rear differential. Without correcting this angle, you may experience:

• Driveline vibration at highway speeds

• Harsh acceleration shudder

• Premature U-joint wear

• Transmission output shaft damage

• Differential bearing stress

This kit includes fully adjustable pinion angle flip brackets, allowing you to dial in the correct angle during installation. Proper pinion alignment is essential for smooth power transfer, quiet operation, and long-term drivetrain reliability.

This feature makes the kit ideal for:

• Daily driven lowered trucks

• Highway cruising

• Performance street builds

• Long-term suspension reliability

C-Notch Brackets – Essential for Suspension Travel and Frame Clearance

When you lower the rear of your Silverado or Sierra by six inches, axle-to-frame clearance becomes extremely limited. Without proper frame modification, the axle will contact the frame during suspension compression, causing:

• Harsh bottoming over bumps

• Loud metal-to-metal contact

• Loss of ride comfort

• Potential frame and axle damage

This kit includes heavy-duty C-notch brackets designed to restore safe axle clearance and allow proper suspension travel.

Benefits of the included C-notch system:

• Provides critical axle clearance at full compression

• Prevents frame contact and suspension binding

• Maintains proper bump stop placement

• Improves ride quality on lowered trucks

• Reinforces the frame for long-term durability

The notch brackets are precision-cut to fit the factory frame rails and integrate cleanly for a professional, factory-style installation.

Built for Strength, Ride Quality, and Long-Term Performance

Every component in this kit is manufactured from thick, laser-cut steel and finished for durability in real-world driving conditions.

Construction highlights include:

• Heavy-gauge steel flip brackets

• Reinforced mounting points for strength

• Precision-cut notch brackets

• Grade-8 installation hardware

• Corrosion-resistant protective coating

Whether your truck is a daily driver, weekend cruiser, or show vehicle, this kit delivers the strength and geometry control needed to handle miles of street driving and spirited use.

Perfect for Street Trucks, Show Builds, and Performance Lowered Setups

This 6-inch rear flip kit is ideal for:

• Lowered street trucks

• Custom show builds

• Sport truck applications

• Daily driven lowered pickups

• Performance suspension projects

Pair this rear kit with a properly matched front lowering system — such as drop spindles, lowering control arms, coil springs, or coilovers — to achieve a balanced, aggressive stance with excellent handling characteristics.

Installation Overview – Professional Installation Recommended

This suspension kit is designed for experienced installers or professional suspension shops.

Typical installation steps include:

• Supporting and removing the rear axle

• Installing flip brackets and relocating the axle above the leaf springs

• Installing new U-bolts and spring plates

• Cutting and welding the C-notch brackets into the frame

• Installing bump stops

• Setting adjustable pinion angle

• Installing correct rear shocks

Welding required for C-notch installation
Final pinion angle adjustment and alignment required
Professional installation strongly recommended

Why Buy From Gauge Store

At Gauge Store, we specialize in performance suspension systems for lowered trucks and custom builds. We only carry proven components that meet the demands of real-world driving and professional installations.

When you order from us, you get:

• Genuine DJM Suspension components

• Verified fitment for GM trucks

• Trusted aftermarket performance

• Fast shipping and expert support

Drop It Right. Drive It Smooth. Build It Better.

If you’re ready to take your Silverado or Sierra to the next level, this 6 Inch Rear Lowering Axle Flip Kit delivers the aggressive stance you want with the geometry correction and structural strength your truck needs.

From adjustable pinion angle brackets and reinforced C-notch clearance to staggered shock correction, this kit is engineered to provide professional results, long-term reliability, and a clean lowered look that turns heads.

Upgrade your rear suspension today and build your GM truck the right way.