i can use the same tranny right (91crx si)? if so, is it possible to leave tranny in car and simply unbolt tranny from block with axles still in place and pull longblock?
is this possible, also can i use same wiring harness? nothing else is different right?

 

the motor should be a direct swap. if you have the motor out, might as well take out the tranny to inspect, change clutch maintenence etc.

 

you have to take the tranny out
i just put a 16z6 in my hatch and i gad to take it all out. besides you want to change the clutch anyways!