2004 4x4 3.4L Manual. . . .went to drive my truck to work this morning only to find that when I lifted the clutch there was nothing. It shifts into gears, or so I think it does; the stick goes completely in and out of each gear. I had a clutchmaster stage 2 put in 2 years ago along with new synchros; let's just say I wasn't going about the smartest ways of getting people unstuck. Anyway, I figured it just needed to warm up but after a minute or two it wasn't doing anything different. I'm not mechanically inclined. . .. yet, but I'd like to know some possible causes just so a local shop doesn't try to screw with me.