5th gear trouble

[Zer0DazE]

I just got done putting a jdm tranny (non lsd) in my prelude. I went to take it for a spin and i felt a little grind going into 5th gear. A few miles later when i went to go into fifth, the gear was gone and it just reved out like it was in neutral. All the other gears seem to work fine. Why is this happening?

because you bought a bunk trans