1N5AN3

Hey everyone need some help plz, I've done a conversion into my 1994 Toyota corolla hatch. Everything is fine apart from I can't select first and second gear??? It is running the gear shift and linkages from the half cut (toyota levin) I'm now thinking do I have to go back to the standard shift and linkages??? Sound easy but with no room between the fire wall and motor makes it kinda hard, that's why I'm looking for some help b4 I do so lol, anyone done this and have one working fine thanks???