Quote Originally Posted by gale View Post
Definitely go with LSD. 3.64 would be my 1st choice. We put one in my son's 535i when we did the swap and in my opinion it's perfect. I have a 3.91 in my 7 and it's a bit too shallow. A 3.73 would be my 2nd choice but they are somewhat scarce.
What diffs were in those cars before? And what tranny is in the 535?