I have a 2008 g37s coupe rear wheel drive 6 Mt only 30k miles and it just started grinding while going into second above 3k rpms the power is still there and the clutch is not slipping I suspect its the synchros but I cannot find a rebuild kit for this transmission anywhere and I am a few months outside of powertrain warranty does anyone know if there is another option apart from replacing the entire transmission?? Or can point me in the right direction to find the parts I need. Help!!!!