A complete XJ 4.5 lift needs coils, leaf springs, control arms, a track bar, shocks and brake lines. See the parts, axle limits and tire sizes.
Jeep JK Lift Heights: 2.5 vs 3.5 vs 4.5 Inch Compared
Jeep JK lift heights compared: the tires 2.5, 3.5 and 4.5-inch lifts clear, the track bars, arms, lines and driveshafts each needs, and which height fits you.