My 2008 6mt g37 has some transmission issues.

My 6th gear went out a month ago. The shifter usually has no problems getting into 6th gear but when it does it either stays in 5th gear or neutral.
I had my clutch replaced because I needed it anyway, but that fixed nothing. Anybody know what might be wrong or any ideas?
(1-5 has no problems at all)

 

Not sure what’s wrong, but this part will 100% fix the problem.

 

Wow I have the same issue too, my 6th gear grinds like crazy unless I precisely rev-match. 5th gear does it sometimes but rarely. Honestly you should consider a rebuild, as these transmissions are insanely strong and finding a replacement will be expensive. Have you tried *correctly* double clutching into 6th? When I do that I have no issues.