I just recently bought a 2002 mustang gt. The guy I bought it from told me that he put a new clutch in a couple months ago. The car has 150k miles on it. Now 1st and 2nd shift great..but everytime I shift into 3rd and sometimes 4th it grinds into the gear. It shifts into fine it just grinds. I am wondering if someone else he has this problem or not and was curious as to what is causing it. Also the clutch is stupid stiff. This isn't my first mustang gt as my last one was an 01 gt so I know that the Clutches are normally still but this one is abnormally stiff. If someone could help me out that would be great. Thank you guys for your time.