Recently my 13 boss started to gain pedal travel on each shift at high RPM's. On the 1-2 shift, I end up with about an inch of slop at the top of the pedal, 2-3 shift leaves 2 -3 inches of slop, 3-4 shift isn't happening at all. Stop the car, let it sit 30 seconds or so, it is back where started. I figured P.P sticking because it only does it at 7000 or so, but I thought the slave may cause this problem if it thought I was stepping on it too fast and fluid was getting around the piston seal, but I have no fluid loss. Car is going into the dealer for a tranny rebuild next week, so I ant to get the clutch fixed while it's there. Any tips would be helpful.