Ford explorer 1992 4wd transmission?

It was going through fluid like it had a leak no sign now it only wants to drive in reverse won't go in gear. It's holding fluid now but won't go in gear?

Make sure you're checking the fluid properly. Get the transmission warmed up, run through the gears (10 seconds in each position) leave it idling in park, make sure the level is at (or less) than the MAX mark.