Originally Posted by e39_touring

I agree on the TC, simpler is better. Understanding how the systems works and having owned/driven pre and post LCI X5's at the same time in snow, I just don't see any advantage to x-drive with non-locking front and rear differentials.

Your acceleration won't decrease by 11% by installing 3.64 diffs. Yes, in a given gear and at a given rpm, the accelleration at that point will be 11% less. BUT, you'll hold a gear longer (or downshift) and shift less on the way from 0-60. I bet your 0-60 wouldn't be affected if it required one less shift. Mine are in the process of going in; I'll let you know how it goes when I get her buttoned up.