have a 93 f150 wI6 and mazda m5od. It occassionally won't go into first or reverse. Have read that is is probably the slave cylinder and throwout bearing. I need to replace the three leaking plugs on top of the trans as it is, which can be done without removal but I am thinking I should do both jobs at once, any advise???? thanks

 

I wouldn't rule out the pilot bearing.