There are people here that are better at answering you then me but i can tell you that the 80 has a cable clutch and 77s back had hyd. but do not fear as the 78-80 cab have the spot still in the firewall to drill out and use the hyd setup. This is what i did to my 78 but i used a willwood hyd. setup. If you look at the firewall from inside you can see the spot for the hyd. cyl. and bolt pattern that needs drill out. Hope this helps.
_________________ 1978 pro street step/side 455Buick, 4sp,4.11s, 31/18.5s
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