it could be a JDM gsr w/LSD or b16a, b16b, or jdm itr....you gotta either open it and count the teeth or turn the input shaft in all the gears and carefully count the diffs rotations, then look up the ratios and see what adds up. (dont forget that it could be some combination or the above trannys, so it might take some calculator work.) those are the only 2 ways to know for sure what you have.