Reply to "ZF won't shift when cold?"

Are you SURE the shift rod that goes back and forth thru a guide under the left side header, is free and lubed? Most Panteras have NEVER had this device lubed since the car was at the Factory (if then), and it's a rubber-mounted steel tube guiding a steel shift rod. Once hot, metal expands.... Your red owners manual said to inject motor oil under the boot (which has probably rotted away) every so often.
BTW, some vendors sell teflon lined aluminum shift-support guides; when heated, the soft teflon crawls away from the single setscrew that holds it in place and slides out of position. This leaves the shift rod completely unsupported and causes sloppier shifting than you had to start with. Teflon cannot be glued, either.