Fits: GMC Sierra 2500HD / 3500HD 2wd & 4wd 2020, 2021
2020-2021 GM 2500/3500 HD including AT4
2" Adjustable Leveling Kit
Forged Torsion Keys with shock spacers, differential spacers and longer hardware.
Allows for 20x9 +18 or 0 offset - 35x12.50 tire.
*Trimming may be required with some tire styles on 20x9 0 offset - 35x12.50 or 325/60R20
Some fender well variance may be experienced between Silverado and Sierra models.
66-3020 works with trucks equipped with either the OE #84461807 or OE #84634344 factory torsion keys and requires ReadyLIFT torsion key unloading tool 66-7822B or similar for installation