Ok, I was driving down an on ramp running about 75% throttle and when I shifted from 2 to 3, the clutch was 5-10 times heavier than it usually is, and it didn't go into gear. I let go of the clutch and put the transmission into nuetral and just paused. A few seconds later I reclutched and it went in fine, got up to highway speeds in 5th no problems. Coming out of 5th to 4th it did it again, heavy pedal, refusing to go into gear. Once I got the engine sped down it all worked fine and with no more incident on that trip. Coming back home it did it once from 2 to 3 (lightly, I was shifting about 2500), and then worked fine for the remaining 45 minutes. I am thinking my clutch is pretty much gone, but seeing if anybody else had this and it was something else.