Rough Country 90640 — 4 Inch Lift Kit | M1 | Jeep Wrangler TJ 4WD (1997-2002).

About this part

Who says your Jeep TJ can't handle both weekday commutes and weekend trails? Rough Country's 4-inch Lift Kit delivers the perfect balance of off-road performance and smooth highway comfort. Engineered by our Research and Development Team, this kit gives your TJ the clearance and capability it deserves. Lifted Coil Springs for Superior Stance: Precision-tuned, application-specific coil springs provide a 4-inch lift, improved ground clearance, and a factory-like ride on any terrain. Durable Tubular Control Arms: Outfitted with heavy-duty construction and OEM-style rubber bushings, these arms reduce vibration and ensure reliable articulation off-road. Optimized Driveline Geometry: A tubular transfer case drop and included track bar bracket maintain proper driveshaft angles to minimize wear and vibrations. Extended Sway Bar Links: Keep your suspension geometry in check for consistent handling and stability on and off the trail. Premium Shock Options: This kit comes standard with our high-performance N3 shocks, featuring 10-stage variable valving, high-pressure nitrogen charging, and a durable 54mm shock body for long-lasting vibration dampening. Upgrade to V2 Monotube Shocks for faster heat dissipation and precision handling or M1 Monotube Shocks for maximum off-road performance and superior ride control. Transform your Jeep TJ into a capable, trail-ready machine without sacrificing daily driving comfort with Rough Country's 4-inch Lift Kit.

Manufacturer features

Hassle-Free Installation: Easy bolt-on design gets you back on the road quickly with no cutting or welding required. Enhanced Ground Clearance: Conquer rough terrain with confidence and tackle larger obstacles with ease. Perfectly Leveled Stance: Eliminates the factory nose-down rake by leveling the front with the rear of your vehicle. OEM-Quality Ride: Coil springs are precision-engineered to factory spring rates, maintaining a smooth and comfortable ride. Optimized Driveline Geometry: Solid tubular transfer case drop keeps driveshaft angles correct to reduce vibration. Durable Control Arms: Includes OEM-style rubber bushings for long-lasting performance and factory-like articulation. Custom Shock Options: Select from nitrogen-charged N3 shocks, V2, or M1 Monotube shocks for a ride tailored to your off-road needs and preferences.

Important application and installation requirements

Automatic transmission models may require a SYE & CV Drive Shaft to fix driveline vibrations – adjustable lower control arms SKU: 1190 may also be required in conjunction with the SYE and CV Drive Shaft.

Manufacturer-listed applications

1997-2002:4WD:Jeep:Wrangler TJ

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: 90640. Shipping weight: 131.00lbs. Supplier shipping classification: Ground Only.

Rough Country product specifications and restrictions

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