Clutch, or Tranny problem?????

[thestartupman]

I have a 2000 F450 with 7.3 Diesel, and 6 spd manual Trany. I was driving to town yesterday, and noticed that the clutch pedal had a vibashin in it, and was harder going into gears. I got a few miles down the road, and it felt like it popped out of gear, but it was still in gear, and it was making a grinding noise. I tried other gears, with the same problem. I had it towed home, and messed with it this morning. When it is in Reverse, or low gear, it will go in and bite pretty good, unless I put it under a load. It isn't very easy to get into Low, or reverse though. If I put it in any other gear, it slips very easy, and makes the grinding noise. Does this sound like a trany problem, or the clutch? Hope you guys can help.