For some time, my clutch pedal would not immediately return to "pedal-up" position, mainly when shifting out of gear when coming to a stop. Pedal would come to about 75% off the floor and then pop to 100% off the floor after a few seconds. I figured the problem was mechanical in the pedal linkage under the dash, but everything looked OK, including the master and slave cylinders and fluid level in the master reservoir. Today the pedal failed to come all the way up while shifting between gears. The problem gradually grew worse while driving until the pedal would not come up at all. At this point I found my clutch would not disengage. I managed to drive the rest of the way home without a clutch, forsaking 5th gear. Truck is at 270,000 miles. History prior to 235,000 miles is unknown. There have been no prior clutch related problems or repairs since 235K. I have not had a chance to further diagnose the problem. Has anyone else suffered these same symptoms? Thanks for the help.