trying to decide on which tranny i should go w/ to go onto a B18c motor...Y21 or S80. both come equipped w/ LSD. i am also planning on adding an 4.785 FD. i need some info on which would be a better tranny. should i just go w/ a Y21 tranny w/ no 4.785 FD or go with the S80 tranny and add a 4.785 FD???

 

I never heard of ANY of those two trannies.

 

Y21 is off of a US ITR, or jdm SiR. S80 or Y80 is from a gsr tranny.

 

http://www.bseries.net/html/specs/btrannyspecs.php

just make sure the S80 isn't a LS tranny