So i just put a motor in my 2010 speed 3 and before it blew up 4th gear would take some effort to get into. now i got my car all running and everything was good but still no 4th gear it just grinds ive tried adjusting the shifter cable and itll work for one or two shifts then it just goes right back to not fully engaging and grinding. anybody ever seen this before????? and can yall please help?????