I bought a 71 CJ 5 last summer and I have a Dana 27A front diff. I heard that I can swap front diffs with a 77 or newer CJ that already has disc brake set up. Does anyone know if this is true? If so, what do I need in terms of steering parts to adapt my Jeep for this front diff? Can I use the stock mastercylinder if I don't have power brakes? I appreciate any info.