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Edward and Bill thank you so much for info, between picture and your info Bill, I figured out my 66 mule drive pulley comes of and threads right on my 67, maybe I should have known that already, sometimes between long hours at work and kids I miss obvious things.lol, I will post a couple pics when I get new belt, hopefully by weekend, weather looking better.
Bill, as far as length on turnbuckle goes,I'm not sure yet, never tried mine except in garage but I will let you know, I made mine 3.5" I do think 4.75" would be a little long,