Yes you can replace just the pulley or clutch without emptying the system. In 98 the pulley design changed fyi. I found out the hard way. Take out the fan,shroud,serpentine belt as well as the skid plate. One bolt holds the clutch/pully on 12mm i think. Fairly easy fix
98 scab 4.6 4x4, gotts mod, straight piped, custom bumper, rock sliders, aussie locked rear, welded front, 285/70/17s goodyear territories, rust and dents
D60/10.5 swap, bobbed, wb shortened and flat deck in progress.