I'll take bets your problem is the clutch lever, under the dash, above the steering column, right side. It has a pin that pushes the rod that drives the fluid from the Clutch Master to the Clutch Slave. As the pin wears [from never being lubed, after the **** bushing Ford makes fails] you clutch release point gets farther and farther to the floor until it stops pumping enough fluid because the travel is to short to make the slave open the clutch.
Been there a bunch. Bought a bunch of trucks with that problem after the owners spent $$$$$$ putting in new clutches and masters and slaves.. and still couldn't make a clutch work.
The part you need is PN: E 4 T Z- 7A554-A if you can find one... Ford no longer makes them, and many dealers no longer have them in stock. The same part fits from 1980 to 1994 I believe... but Powers That Be at Ford don't believe the millions of Fords still on the road are worth supporting, I suppose.
I just did one last week.. same problem. I found a new part in Another State, bought it immediately. While I waited to get the part I built a new pin. it works better than new because it has a proper bronze bearing.
I'll try to attach pictures to this post.. never done that before so cut me slack .. ok.
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The last pic shows the old pin laying beside the new assembly for contrast.
The worn pin is spot welded.. or rivited.. depending on which sub-contractor made it for Ford. You have to grind the weld or rivet flush on the back side, then use a flat face punch and drive the old pin out. I chose to braze the new one in so I could float weld material into and around the new pin which was not serrated like the original.
Apology for the pic quality... only a camera phone to works with.
Ohh.. total cost for the repair parts from my local ACE hardware, $14.67 . Labor took about 6 hrs total because the lever under the dash fought like hell, having NEVER been taken off before.
REMOVE THE SEAT... you can't get there with it in, unless you are a fricking midget.
