So i got my transmission rebuilt because my 2nd and 3rd gear were chipped and i also installed an exedy stage 1 clutch. So yesterday i put everything back together lowered the car turned it on and it was fine. I take for a test drive and everything is going fine until i go to shift to 3rd gear, it won't go in it jumps back into neutral. So i tried again and it jumped back into neutral and i tried to keep in in gear but i heard a grind so i let go immediately. Does anyone know what is causing 3rd gear not to go in?