UMI Performance 6402-B Stage 2 Handling & Lowering Kit 4.5"/6" Drop Black

The UMI Performance 6402-B is a complete Stage 2 handling and lowering kit engineered to deliver an aggressive stance and dramatically improved ride dynamics for the 1973–1987 GM C10 squarebody truck. This all-in-one suspension upgrade combines front drop spindles, UMI coil springs, a rear flip kit, shock relocation hardware, and a full sway bar package to transform your truck from the ground up.

Up front, UMI lowering springs paired with drop spindles achieve 4.5" of front drop while retaining compatibility with stock GM brakes and wheel bearings — no need for a brake system overhaul. Out back, the UMI flip kit, shock relocation bracket, and factory leaf springs work together to deliver a 6" rear drop for a level, slammed squarebody stance.

Handling is upgraded through a complete sway bar package: a 1-3/8" heavy-duty tubular front sway bar minimizes body roll, while a 1" three-way adjustable rear sway bar lets you fine-tune handling balance to suit your driving style. The kit is completed by UMI monotube shocks valved specifically for the squarebody platform, providing a comfortable yet controlled ride whether you're daily driving, hauling, or carving corners.

Key Features:

• 4.5" front drop via UMI lowering springs and drop spindles
• 6" rear drop via flip kit, shock relocation bracket, and factory leaf springs
• 1-3/8" heavy-duty tubular front sway bar
• 1" three-way adjustable rear sway bar for tunable handling balance
• UMI monotube shocks valved specifically for the squarebody platform
• Drop spindles accept stock GM brakes and wheel bearings
• Minor drilling required for installation
• Finished in gloss black powder coat
• 100% Made in the USA
• Power Tour, daily driver, and corner-carving proven

The 6402-B is part of UMI's #umitrucks lineup and is powder coated in gloss black. All components are manufactured in the USA using North American-sourced materials, laser-cut and finished with Tiger Dry Lac powder coat for long-lasting durability.