On my 1982 mustang gt with a 4 speed manual I couldn’t get it into gear after I started it, so I adjusted the firewall clutch out and then it worked then the next day it wouldn’t go into gear then I adjusted the fork adjuster (not sure what it’s called) and it worked, and then after about an hour or so it won’t go into gear and it grinds when I try to put it into reverse... if anyone has any clue what can cause this please let me know. Thanks.