Posted a response in a different section but it probably belongs here. Currently on my 98 sport (4wd/ControlTrac) the OD is engaging then quickly disengaging at highway speeds (around 60mph is when it will start presenting itself.) I believe the "speed mismatch" is what is causing my issues with the I recently had a tire that was replaced with a brand new one (same tires all around) and I believe it is the tread depth that is causing the speed mismatch between the axles, engaging the transfer case causing it to hop out of OD. I do not recall this issue ever arising before the new tire, no codes were reported to me after a local trans guy hooked up his scanner and monitored the shifting. I'm wondering if putting another new tire on the same axle will solve this problem, but I don't know how the speed sensors in the axles are compared (right to left, back to front, both, etc) which signal the computer to activate 4wd. Can the BWM solve this riddle?