Weird s13 gearbox problem help ASAP

[Nick B]

Hey guys really need some help, on Friday I bought a s13 sr20det 5 speed, with a exedy button clutch and S15 LSD diff aswell as plenty of motor mods. Now I have an issue with the box, driving it yesterday I was changing though the gears to notice I no longer had 5th, the shift feels normal but when it's in (stays in by itself) it's like I'm in neutral, I thought oh shit just get it home in 4th drive it to work today and look at it, then I stopped at the shops yesterday went to reverse out reversed fine but no forward gears... I select 1st gearbox feels like it goes in but the car just doesn't want to move, bit the box in neutral and it's in reverse, reverse it back to a space and leave it for 10, get back in rock it a little and we are good again, drive it home get to work today and go to reverse into a space and same thing happens will go backward fine just no forward, motor seems fine, so does the clutch, just won't go forward... Anyone had any experiance with this? Cracked selector shaft maybe???
Thanks in advance guys
Nick

[AlexinPerth]

I would guess that 5th gear is broken, and the broken off teeth are getting stuck between other gears / idlers.

Best bet woud be to get a second hand box and put it in.