When ever I am driving up a hill and go to shift in to 4th (either upshifting or down shifting) it tries to grind on me. It has started to do it more often and has even done it once in to 5th. If I double clutch it doesn't do it, but it still grinds if I rev match. Any Idea what it could be( bad tranny, slave cylinder, ect.). My car is an '89 coupe with an sr and ACT street and strip clutch. thanks in advance for the help.
