I have an LS transmission in need of a differential. I'm at the end of my engine build & for now am going to use this tranny till I rebuild my Y21. My question is there any difference between the hyrdraulic B16 & LS differentials. Will it be a direct swap out? I also am seeing a lot of B16 diff's for sale coming out of the 99-00 civic SI's but I know these got the upgraded diff's. Will the 99-00 SI B16 diff's be a direct swap out as well? Any difference? Lastly, assuming I can't find a 4.40 FD will the LS FD swap onto the B16 diff's fine? (even the 99-00 SI ones?) Thx, need to know ASAP. Also, please don't waste my time & tell me how much the LS transmission sucks. I got screwed on this transmission. It was suppose to be a GSR & I just need to get it back together & use it temporarily.