Jack shafts Aug 4, 2007 18:31:47 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by ruppking on Aug 4, 2007 18:31:47 GMT -5 Hi, I need a jack shaft BUT i don't know if the 71 Roadsters jack shaft was 3/4 or 5/8 and how long it was.