Rough Country 25840 — 4 Inch Lift Kit | M1 | Chevy Silverado & GMC Sierra 1500 4WD (1999-2006 & Classic).

About this part

Upgrade your truck with Rough Country's 4" NTD Suspension Lift Kit designed for easier installation, superior handling, and a sleek, aggressive stance from every angle. This kit delivers unmatched ground clearance and factory-like ride quality while keeping all components optimally positioned. Run Bigger Tires: A set of lifted front knuckles and 5" rear blocks allow your 1500 to run up to 33" tires with ease. Precision-engineered drop crossmembers, differential drop brackets, and non-torsion bar drop brackets keep everything tucked away for a clean look and peak performance. Fully Loaded Kit: This suspension lift includes front CV spacers, differential drop brackets, sway-bar links, and a protective skid plate giving you everything you need in one complete package. Customizable Shock Options: Tailor your ride with multiple shock choices, including our nitrogen-charged N3, V2 Monotube, or M1 Monotube shocks, so you get the perfect balance of comfort and performance. Whether you're hitting the trails or cruising the streets, this 4" NTD Lift Kit delivers the perfect combination of ground clearance, handling, and aggressive looks. With premium components, customizable shock options, and a hassle-free installation, there's no better way to elevate your ride. Upgrade today and take your truck to the next level!

Manufacturer features

Factory-Mounted Torsion Bars: Retains the original torsion bar location for a seamless, factory-like fit. Streamlined Installation: Redesigned components ensure a hassle-free, more efficient setup. Factory Ride Quality: Engineered to maintain the smooth, comfortable ride you expect. Auto Trac Compatibility: Fully compatible with models equipped with Auto Trac systems. Maximum Ground Clearance: Provides superior lift without compromising performance. Optimal Axle Alignment: Keeps axles in their factory position and angle for reduced wear and improved longevity. No Modifications Required: Installs without the need for drivetrain or exhaust adjustments. Retains Factory Travel Stops: Designed to reuse OEM compression travel stops for consistent suspension performance. Configurable Shock Options: Choose from our nitrogen-charged N3, V2 Monotube, or M1 Monotube shocks—the power to customize your ride is in your hands!

Important application and installation requirements

Frame bracket and differential modification required. Models equipped with factory-painted bumpers will require trimming to the valance and bumper. Does NOT fit 1999 old body style (OBS) models. For a visual, please click here . If equipped with factory 17" wheels and purchasing new wheels, the new wheels must be 17" or larger. For ease of installation, a torsion bar removal tool is recommended 1067 .

Manufacturer-listed applications

1999-2006:4WD:Chevy:Silverado 1500;1999-2006:4WD:GMC:Sierra 1500;2007-2007:4WD:Chevy:Silverado 1500 Classic;2007-2007:4WD:GMC:Sierra 1500 Classic

Read the complete trim, drivetrain and installation restrictions. Application records are manufacturer supplied; they are not an independent fitment certification.

Manufacturer installation instructions

Manufacturer part number: 25840. Shipping weight: 199.00lbs. Supplier shipping classification: Ground Only.

Rough Country product specifications and restrictions

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