Hi new here, my transmission got stuck won't shift between gates or gears happened while car was parked. My son was driving last, claims no abuse. It is a 5 speed manual in a z24 with the 3.1 6. I tried to isolate linkage problems, none seen, and now have the trans out of the car with no clues on how to disassemble to find the jam up I need advice on a budget fix, thanks