Hi guys need some help i have a 09 g37s coupe 6mt and out of nowhere it will not go into reverse it keeps popping out when i let the coutch out,it feels like its not going into gear properly but i can go back anymore with the shifter,any ideas what it can be? I didnt get any signs of goin. Ad just over night it happened the car has aftermarket clutch and everything to do with the clutch was changed and also i have the stillen short shifter installed