Years ago I had a guy in the 'Springs rebuild my ZF5. I would have to go look thru my file, but I could do that if it would help. I don't recognize any names google is giving me so I wonder if he's still in opertaion?
1973 Bronco, 351 SEFI, Locked, discs, 35's ZF-5spd and Atlas 4spd. 235:1 Crawl Ratio. It may be ugly, but it's slow. http://www.ucora.org