I know this may sound stupid but weirder stuff has happened Is the clutch in correctly and not in backwards? I know sounds stupid but sometimes the easiest thing can be the problem. Check your lines for leaks also.

Bring on the flames that you can not put it in backwards lol.

 

This is for the Ranger which has a different master design but it might work for you since you're having such problems:

 

That's an awesome walk through, and it's almost identical to the f-150 just a little bigger.

 

Putting the clutch in backwards was my first thought but I put it in right the way the clutch I bought was designed it couldn't be put in backwards.

Ok after going back to advanced auto I was told 4-5 people have had problems with those slaves and its protocol for them to tell me after the 2nd slave return that they will refund my money and suggest I buy it directly from Ford.... they couldn't tell me this before? So I gotta take it out for the 4th time.... anybody else need their manual trans taken out I garentee to have it out in 45 minutes..... working in the dirt and we just had all this rain lol.