1989 F250 4X4 with Mazda M5OD mated to 302.

I had the transmission and clutch replaced in 2014, and with the clutch, the slave cylinder and other bits. Basically, when it as done, it was new again. I don't think the shop resurfaced the flywheel, as there was a vibration when I'd let off the gas to come to a stop. Until last week, I only put 700 miles on it since the work was done and all of that was local in town driving less than 45 mph. Last week, however, I had to drive it from my house in PA to my new home in Ohio...a 276 miles trip, drive to drive. I had originally decided to take 40 across Ohio, due to the vibration at higher speeds, but about 100 miles into the trip, the vibrations stopped and I was able to reach highway speeds smoothly and with ease. I figured that the clutch finally wore in with the flywheel, and life was good. However, when I came to the stoplight at the final off ramp, my clutch pedal didn't come back up all the way. When I took off, the clutch felt fine, but I only had half the pedal I had before. I made it to my destination, figuring I'd look at it the following morning.

The following morning, I took the truck out for a spin, and the clutch felt fine...I had 100% of the pedal again. I drove it around 50 or so miles, finally taking it out on the highway again. After 10 miles, I hit the off ramp, and was back to half clutch. The drive back to the house was around 5 miles, and by the time I got back home, I had full clutch pedal back.

I'm thinking it may be the slave cylinder again, and am not looking forward to doing it again.

Has anyone else had this happen before? If so, am I close to the cause of it?

I'm just trying to get a good idea of what it may be before my buddy and I open it up.

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1987 560SL
85,000 miles