I once bought a '53 6100 with the same problem. I found a rat's nest in the pressure plate. Centrifugal force had stuffed it into the works and wouldn't let it engage the disc.

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"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.