compressor clutch or whole compressor?

[mtdave2]

i finaly had 10 mins (litteraly) to take a fast look at my trucks a/c. now im not so sure the whole compressor is bad. im thinking its just the clutch, how do i tell?

i have turend the out side part (the end of the clutch) and it spins fine. i assume this is turning the compressor. now the part that the belt goes to turns rough, catches, like the ball barrings are toast.

bad clutch?> or whole thing??

what is invalved with just chaning the clutch? im faced with a 700 bill if its the whole compressor, so i wont mind if i have to buy a 100 tool!