2WD Crew Cab – 4 Inch Front / 6 Inch Rear Complete Lowering Kit

For Crew Cab trucks with welded rear leaf spring eye hangers and OEM two-piece driveshaft

If you’re ready to push your Silverado or Sierra beyond a mild drop and into a true street-truck stance, this 4 Inch Front / 6 Inch Rear Complete Lowering Kit delivers the aggressive look you’re after—without sacrificing ride quality, safety, or suspension geometry. Designed specifically for 2003–2006 (2007 Classic) Chevy Silverado and GMC Sierra 1500 2WD Crew Cab trucks, this system is engineered for vehicles equipped with factory welded rear leaf spring eye hangers and an OEM two-piece driveshaft.

This is not a pieced-together solution or a universal kit. Every component works together to provide a true 4/6 drop, proper driveline angles, adequate suspension travel, and predictable handling. Whether you’re building a daily-driven street truck, a show-quality cruiser, or a full custom audio or wheel build, this kit delivers the stance and performance today’s lowered truck owners demand.

Vehicle Fitment

Fits:

• 2003–2006 Chevy Silverado 1500 2WD Crew Cab

• 2003–2006 GMC Sierra 1500 2WD Crew Cab

• 2007 Silverado/Sierra Classic 1500 2WD Crew Cab

Does NOT Fit:

• 4WD models

• Extended Cab or Regular Cab trucks

• Trucks with single-piece driveshafts

• Trucks without welded rear leaf spring eye hangers

Built Specifically for Crew Cab Silverado & Sierra Trucks

Crew Cab GMT800 trucks present unique challenges when lowering beyond a mild drop. Factory suspension geometry, welded rear hangers, staggered shock mounts, and limited axle travel must all be addressed correctly—especially when stepping into a 6-inch rear drop.

This complete lowering kit is engineered specifically for Crew Cab trucks, not extended cab or regular cab models. It accounts for:

• Welded rear leaf spring eye hangers

• Factory staggered rear shock mounting

• OEM two-piece driveshaft geometry

• Increased suspension travel demands at lower ride heights

By designing around these factory characteristics, this kit avoids common problems such as driveline vibration, harsh bottoming, axle wrap, and premature component wear.

4-Inch Front Drop with Lowered Control Arms (Factory Coils Retained)

The front suspension is lowered using precision-engineered lowered control arms, delivering a full 4-inch front drop while retaining the factory coil springs. This approach offers several advantages over spring-only lowering methods:

• Maintains factory spring rate and ride comfort

• Preserves suspension travel

• Keeps alignment within adjustable range

• Improves steering response and front-end stability

Each control arm arrives fully assembled, significantly reducing installation time and eliminating guesswork.

Front Control Arm Features

• New heavy-duty ball joints pre-installed

• High-quality urethane bushings for improved durability

• “Twin tube” pivot sleeves for controlled movement and long life

• Designed to maintain correct camber and caster settings

By retaining factory coils and correcting geometry through the control arms, your truck sits lower while still driving like a truck—not a slammed compromise.

6-Inch Rear Drop with Axle Flip and Reinforced C-Notch System

Achieving a true 6-inch rear drop on a Crew Cab truck requires more than flipping the axle. This kit uses a complete rear axle flip system combined with essential reinforcement and correction components to ensure long-term reliability and safe operation.

Rear Suspension System Includes

Axle Flip Kit

Relocates the rear axle from beneath the leaf springs to above them, delivering the full 6-inch rear drop required for a leveled, aggressive stance.

Pinion Adjusting Axle Brackets

Correct driveline angles after the axle flip to prevent:

• Driveshaft vibration

• U-joint wear

• Premature driveline failure

These brackets are especially critical on trucks with OEM two-piece driveshafts, ensuring smooth operation at highway speeds.

Heavy-Duty C-Notch Reinforcement Brackets

At a 6-inch drop, frame clearance becomes a critical concern. This kit includes thick, high-strength frame reinforcement brackets designed to support the necessary C-notch, allowing proper axle travel without frame contact.

These reinforcements:

• Maintain frame strength and integrity

• Prevent frame flex or cracking

• Allow safe suspension compression under load

Passenger-Side Shock Relocator

Factory rear shock mounts on these trucks are staggered—one in front of the axle and one behind it. To accommodate the new ride height and maintain proper shock travel, a passenger-side shock relocation bracket is included, ensuring consistent damping on both sides of the rear suspension.

Complete Hardware Package

Included are:

• New U-bolts

• Spring plates

• All required mounting hardware

No extra parts runs, no mismatched components, and no cutting corners.

Matched Shock Package for Correct Ride Control

Lowering your truck without properly matched shocks leads to poor ride quality and shortened shock life. This kit includes application-specific shocks selected to work with the new ride height and suspension geometry.

Shock Configuration

• Front Shocks: 1415 (Qty 2)

• Rear Driver Side Shock: 1800

• Rear Passenger Side Shock: 1900

The staggered rear shock lengths account for factory mounting positions and the included shock relocation bracket, ensuring consistent damping and proper suspension movement.

Ride Quality That Still Feels Like a Truck

Despite the aggressive drop, this kit is designed to maintain a controlled, comfortable ride suitable for daily driving. By retaining factory front coil springs, correcting rear geometry, and using matched shocks, the suspension remains compliant while significantly improving handling characteristics.

Drivers can expect:

• Reduced body roll

• Improved steering response

• Stable highway manners

• Predictable braking behavior

• No excessive harshness or bouncing

This setup allows your Silverado or Sierra to sit low without becoming impractical.

Designed for Strength, Durability, and Real-World Use

Every component in this kit is manufactured using high-strength materials, precision welding, and proven designs trusted by professional installers and experienced builders. From the control arms to the axle brackets and frame reinforcements, this kit is built to withstand real-world driving conditions—not just car show parking lots.

Urethane bushings provide improved longevity over rubber while still allowing controlled articulation, reducing deflection and improving handling without introducing excessive noise or vibration.

Installation Overview

This is a complete bolt-on lowering kit, designed for professional installation or experienced DIY builders with proper tools.

Installation Notes

• Fits 2WD Crew Cab trucks only

• Requires OEM two-piece driveshaft

• Designed for trucks with welded rear leaf spring eye hangers

• C-notch installation required (reinforcement brackets included)

• Professional alignment required after installation

Most professional shops can complete installation in one to two days, depending on experience and shop setup.

Perfect for Aggressive Street Truck Builds

This 4/6 lowering kit is ideal for:

• Street trucks

• Custom wheel and tire setups

• Audio demo vehicles

• Show builds

• Performance-oriented daily drivers

If you want your truck to sit noticeably lower than a mild drop without sacrificing drivability or safety, this kit delivers the ideal balance.

Why Choose This 4/6 Complete Lowering Kit?

✔ True 4-inch front and 6-inch rear drop
✔ Retains factory front coil springs
✔ Corrected pinion angle for smooth driveline operation
✔ Reinforced frame notch system included
✔ Matched shocks for proper damping
✔ Designed specifically for Crew Cab trucks
✔ Complete hardware package included

This is a no-compromise lowering solution for builders who want an aggressive stance done the right way.

Final Thoughts

Lowering a Crew Cab Silverado or Sierra this far requires careful engineering and the right components. This 2003–2006 (2007 Classic) Silverado/Sierra 2WD Crew Cab 4/6 Complete Lowering Kit provides everything needed to achieve a bold, street-ready stance while preserving ride quality, driveline integrity, and long-term reliability.

If you’re serious about building a lowered truck that looks right, drives right, and lasts, this kit is the foundation you can trust.