Got me on that one. Maybe this will help?

Quote Originally Posted by deermagnet View Post
Here's a good explanation of how TOD works. It's for '98 vehicles that have a push button switch that engages the front axle. Ours is the same except it's on all the time.
13.9 MB, 11:13 - http://www.drivehq.com/file/df.aspx/publish/mgpa/techvids/tod.wmv