Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
No pressure to the end clutch is certainly going to cause you a problem! If your other circuits are all reading normal and you have no pressure on end clutch in 3rd/4th this is really only going to leave an issue with the valve body or the seals on the end clutch drum/piston/etc.
Drop the valve body and use a air chuck with rubber nozzle and pressurize port 4 in the diagram I attached; does the port hold pressure or does it leak internally somewhere?
Thanks.If the port holds air pressure then that means there are no leaks leading to the end clutch assembly.... that only leaves your valve body to be at issue.Time to pull it again and double over everything, something is preventing line pressure from reaching port 4 if you aren't seeing any pressure during the line pressure test for 3rd/4th.