The early 60s chevy and GMC trucks used a hydraulic clutch setup. The latemodel trucks also use a hydraulic clutch but you would have to use the latemodel trans as the bellhousings do not separate from the trans and they use a hydraulic throwout bearing setup. If I am remembering correctly there are companies that sell a universal hydraulic throwout bearing that can be adapted to most bellhousings. I hope this helps. Jeff grin