Product Details [Application] Fits both four-wheel drive(4WD) and two-wheel drive(2WD). Works with 2004-2020 Ford F-150. Rear Blocks are 3" Tall and will Replace the 1.5" Factory Blocks on 4WD Models, Resulting in a 1.5" Additional Rear Lift. 2WD Models have No Rear Factory Pre-installed Block and will Achieve A Full 3" Rear Lift. This leveling unit does not come with installation instructions but is completely bolt-on; please consult a professional if you need support. Should take 2-4 hours to install and does not require any additional shock absorbers, cutting, welding, or other forms of modification. .