My '71 also uses a cable, but it's something my Dad's mechanic scabbed in 20 yrs ago because my Dad always had trouble with the stock set up. It broke on me once while off road, and going to the local Jeep dealer, who was also a Chevy dealer, I found out it's a GM e-brake cable! U shape bolts to pedal, then long cable does a big "U", to the retainer clip in line with the fork. Threaded rod on the end allows stock Jeep fork pull thing to thread on/adjust, jamb nut holds it. Actually works pretty smooth, but the cable threads are breaking again. I have the AA chain drive set up ready to install as soon as I finish and test my lock right (still waiting for new cross shaft). Tell me about your probs with the AA Chain?? Sorry I can't help with the hyd set up.