Fabtech K1211 3-Inch Ball Joint UCA Lift Kit for Factory ARC — 2025 GMC Sierra 1500 Denali

Fabtech K1211 raises the vehicle using replacement upper control arms, front spacers and rear blocks while retaining the factory Adaptive Ride Control front coilovers and rear shocks.

Application

• 2025 GMC Sierra 1500 Denali, 2WD or 4WD, equipped with factory Adaptive Ride Control and stock suspension. Verify the exact vehicle, factory ARC equipment and rear axle/U-bolt configuration before ordering.
• Does not fit standard cab, Super Cruise, AT4, Trail Boss or four-cylinder models. Chevrolet, other GMC trims and 2026 models are outside this listing.
• Nominal 3-inch system with 1.5-inch rear blocks. The supplied round U-bolts must match the actual vehicle application. Factory wheels and tires cannot be used.

Package contents

• One FTS21306 box: one FT20833 driver and one FT20834 passenger upper control arm, two FT20619 ball joints, two FT20801 upper coilover spacers, two FTBK15 1.5-inch rear blocks, four FT768U U-bolts and specified bushings, sleeves and FT20838 subassembly.
• One FTS21253 ARC adapter kit: two FT20832 ARC spring-perch spacers, two FT20673BK rear shock-extension brackets and FT20874 hardware. Use the ARC perch spacers in place of the standard perch spacers.
• Factory ARC front coilovers and rear shocks are retained; no new shocks or coilovers are supplied.

Installation and requirements

• Professional installation required. Read current FT21248i completely, including the ARC-specific steps, and inspect the factory suspension and alignment before installation.
• Front coilovers require removal, safe spring compression and disassembly. Fit the ARC-specific FT20832 perch spacers, retain and reinstall the specified factory isolators, caps and bumpstops, and align the assembly marks.
• Trim the factory top-cap studs to 1-1/8 inch as directed before installing the FT20801 upper spacers. Remove the factory frame bumpstop tabs and sand smooth. Assemble the arms with the specified greased bushings, sleeves and spacers.
• Reconnect the factory ARC control rods and wiring. Fit the rear blocks and correct U-bolts; retain the factory rear ARC shocks with the two FT20673BK extension brackets, following the ARC-specific instructions.
• Check wheel, tire, brake-hose and ABS-wire clearances through full steering travel. Align to factory specifications, adjust headlights and recheck fasteners and wheel hardware after 50 miles and periodically.

Tire and wheel guidance

• Manufacturer guidance, all with minor trimming and 5-inch wheel backspacing: 33/12.50R18 or 295/65R18 on 18×9 wheels; 295/55R20 or 33/12.50R20 on 20×9 wheels; 285/55R22 on 22×9 wheels. Verify actual vehicle clearance. Wheels and tires are sold separately.

Manufacturer part number: K1211. Manufacturer product details.

California Proposition 65: WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov.