Just to get your attention. Yeah, the clutch hydraulic cylinders on these trucks are not that reliable over time. Change it (maybe the clutch master too, bench-bleed that), and flush out all the old fluid through the clutch bleeder screw.
Is that magazine the same MiniTruckin that was around in the early 1980s? I used to subscribe, but cancelled when divorce cost me the 1975 Chevy Luv.