4‑Inch Rear Lowering Leaf Spring & Shackle Kit

Transform the stance, handling, and street presence of your classic heavy‑duty Chevy truck with the 1973–1991 Chevy C20 / C30 (8‑Lug) 4‑Inch Rear Lowering Leaf Spring and Shackle Kit. Designed specifically for ¾‑ton and 1‑ton square‑body and OBS‑era Chevrolet and GMC trucks, this precision‑engineered suspension package delivers a clean, aggressive 4‑inch rear drop while maintaining proper suspension geometry, ride quality, and long‑term durability.

If you want more drop than a simple shackle can provide, this traditional hanger and shackle combination kit is the proven solution. By relocating both ends of the rear leaf spring upward on the frame by 2 inches each, you achieve a true 4‑inch drop that dramatically improves your truck’s stance without compromising load control or alignment. Yes—removing the factory riveted hangers takes a little elbow grease, but the results are absolutely worth it.

Whether you’re building a slammed shop truck, a clean street cruiser, or a performance‑minded hauler, this kit delivers the classic lowered look that square‑body and OBS truck owners demand.

Built for Heavy‑Duty Chevy Trucks (C20 & C30 8‑Lug Models)

Lowering a heavy‑duty 8‑lug truck requires more than generic parts. This kit is engineered specifically for:

• 1973–1991 Chevrolet C20 (¾‑ton)

• 1973–1991 Chevrolet C30 (1‑ton)

• 8‑lug rear axle configurations

Fitment Notes:

• Rear‑wheel‑drive only

• Not for ½‑ton models

• Not for coil‑spring rear suspensions

• Professional alignment recommended after installation

Always verify your exact year, model, and suspension configuration before ordering.

These trucks carry more weight, use thicker leaf springs, and require stronger mounting points than half‑ton models. That’s why this system uses heavy‑gauge steel components and properly indexed mounting geometry to ensure your suspension remains strong, stable, and reliable after lowering.

How the 4‑Inch Drop Works

This kit combines two proven lowering methods into one complete solution:

Rear Leaf Spring Hanger Relocation

The front leaf spring hanger is repositioned upward on the frame, lowering the front mounting point by approximately 2 inches.

Rear Shackle Drop

The rear shackle relocates the rear mounting point of the leaf spring upward another 2 inches.

Total Drop: 4 Inches

By moving both ends of the leaf spring up 2 inches, the axle and frame relationship changes, producing a true, even 4‑inch rear drop while preserving correct leaf spring arc and suspension travel.

This method offers better geometry and ride quality than extreme shackles alone, making it the preferred solution for serious truck builds.

Classic Lowered Stance with Improved Handling

Lowering the rear of your C20 or C30 doesn’t just improve looks—it enhances overall performance:

• Aggressive street stance – Eliminates factory rake and gives your truck a planted, custom appearance

• Lower center of gravity – Improves cornering stability and reduces body roll

• Improved traction – Keeps the rear tires planted during acceleration

• Balanced suspension geometry – Maintains proper pinion angle and leaf spring alignment

Whether paired with a lowered front suspension or part of a full drop kit, this rear system delivers the ideal foundation for a professional‑looking build.

Heavy‑Duty Construction for Long‑Term Reliability

Every component in this kit is designed to handle the weight and torque of heavy‑duty Chevy trucks:

• Precision‑cut, high‑strength steel hangers and shackles

• Reinforced mounting points to handle load and towing stress

• CNC‑machined holes for accurate bolt alignment

• Durable black protective coating for corrosion resistance

This is not a lightweight cosmetic kit—it’s a true suspension upgrade built to last for years of daily driving and weekend cruising.

Installation Notes – Worth the Elbow Grease

Because GM originally installed the factory hangers using large rivets, installation requires some effort:

• Factory rivets must be drilled or air‑chiseled out

• New hangers bolt directly into the factory frame locations

• No welding required (unless you choose to tack for extra reinforcement)

Yes, it takes a little work—but once installed, the results are clean, solid, and completely worth it.

Professional Installation Recommended

While experienced DIY builders can handle this install, we strongly recommend professional installation for best results and proper suspension alignment.

Shock Compatibility (Not Included)

Shocks are not included with this kit. Proper shock length is critical after lowering.

DJM Recommended Shock:

• Shock #1800

Using the correct lowered shock ensures:

• Proper suspension travel

• Improved ride quality

• Longer shock life

• Reduced bottoming‑out

Always verify shock length based on your final ride height and wheel/tire setup.

Perfect for Custom Builds, Street Trucks, and Restomods

This 4‑inch rear lowering kit is ideal for:

• Square‑body Chevy restorations

• OBS‑era custom trucks

• Performance street builds

• Shop trucks and promotional vehicles

• Show trucks seeking a clean rear drop

Pair it with:

• Front lowering control arms or coil springs

• Drop spindles

• C‑notch kits (if going lower later)

• Performance sway bars

Create a complete lowered suspension system that looks right and drives even better.

Key Features & Benefits

• Designed for 1973–1991 Chevy C20 / C30 (8‑lug) trucks

• Traditional hanger and shackle combination system

• Delivers a true 4‑inch rear drop

• Maintains proper suspension geometry

• Heavy‑duty steel construction

• Improves stance, handling, and traction

• Bolt‑in design (no welding required)

• Compatible with DJM Shock #1800 (sold separately)

Frequently Asked Questions 

Will this kit affect my towing capacity?

Lowering does not automatically eliminate towing capability, but ride height and suspension geometry changes may reduce maximum towing performance. For frequent towing, consult a suspension professional.

Do I need a C‑notch with this kit?

No. A 4‑inch rear drop typically does not require a C‑notch on most C20/C30 trucks, but clearance should always be checked depending on wheel and tire size.

Can I install this at home?

Yes, with proper tools and experience. Removing factory rivets is the most challenging part. A lift, air tools, and patience are recommended.

Will this work with stock leaf springs?

Yes. This kit is designed to work with factory rear leaf springs.

Are U‑bolts included?

U‑bolts and shocks are not included unless specified in your order. Always replace old U‑bolts when reinstalling leaf springs.

Why Choose This Lowering Kit from Gauge‑Store?

At Gauge‑Store, we specialize in suspension solutions for classic and modern trucks. Every product we sell is selected for quality, performance, and proven reliability in real‑world builds.

When you order this 4‑inch rear lowering kit, you get:

• Truck‑specific engineered components

• Expert suspension support

• Fast shipping from a trusted performance retailer

• Access to DJM‑recommended shock solutions

We understand lowered trucks—and we’re here to help you build yours the right way.

Upgrade Your Stance Today

If you’re ready to give your 1973–1991 Chevy C20 or C30 the lowered stance, improved handling, and classic street‑truck look it deserves, the 4‑Inch Rear Lowering Leaf Spring & Shackle Kit is the perfect foundation.

Order now and experience the difference a properly engineered suspension drop can make.