This isn't a clutch problem. If it was, the truck wouldn't move at all or it would be slipping badly and you'd smell it and have a hard time building any speed. You have a clutch pedal problem. There's a master cylinder, a slave cylinder, and a hydraulic line between them. Either there's a leak or one of those parts has a leaking internal seal.
In effect, what you're experiencing with the inability to shift is what happens when you don't push the clutch pedal. We used to drive cars like that quite often. You have to stop the engine, shift to first gear, then start the engine when you're ready to move. You'll still have to push the clutch pedal to turn on the starter safety switch to allow the starter motor to run. Once you build up a little speed, let off the accelerator just enough to remove the load on the engine. The engine should be running at the same speed as the transmission is coasting. That will allow you to slide it into second gear. Accelerate, then do the same thing to slide it into third gear. Slowing down is a little trickier because you have to shift to neutral, then raise engine speed to match transmission speed. When they match, the shifter will slide into gear fairly easily.
Tuesday, July 22nd, 2014 AT 3:33 PM