Take a look at the pictures in post #12 in this thread. You will notice that there is a retainer clip on the back of the shift fork. When you installed yours, are you sure that the clip locked over the head of the pivot pin? Also, when installing the fork did you do it without the slave/rod installed? If they were installed the adjustment might have been to tight and limited the amount you would have had to move the clutch fork and throw out bearing. Was the clutch system bled? If there is air in the system it won't disengage the clutch.