I am 99.9% sure that 1984 was the first year that the fullsize chevys went to hydraulic clutches. Hope that helps a little as to what to start looking for. Can anyone back that year up?
1968 Chevy C-30 292 SM 465 1995 Jeep Grand Cherokee 242 4.0 2005 Jeep Wrangler SE 2.4L & 6 spd