I'm digging around on the bimmerforum.com forum about getting a 3.64 LSD large case for my 1994 540. As many know, they are rare and very hard to find. So I'm asking around to find out how to make it happen. I don't know much, and am learning a lot by asking around. So far I've found that I can use my existing case. I need the LS carrier to make it an LSD unit. I've located a 3.64 ring and pinion from a member on bf.c. But right now I'm trying to find a cheaper alternative to the $500 carrier from diffsonline. Does anyone happen to know if any BMW LSD differential carrier work, or does it have to be one from a large case E34?