The 750 rpm change is the increase the rear made with the gear change. I checked my speed to the rpm and noted all speeds and rpms with all gears. Then increased my rpm 750 on paper for every gear to see if the increse would be good. I have the other sizes on paper at home if you want them. I knew the 750 increase wouldn't hurt me. There are some that are not happy with the lower rears. I found a great web site on BMW diffs with alot of info. Many questions with great info from the group. Their research was my gain. I can't find the site but I printed out everything before my dell crashed. No bookmarks left.
tom
