The clutch is what cycles. It is on the forward side of the pulley. You can visually tell if it is spinning or sitting still.

"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.