Thanks for that info, Kenworth. If/when the vacuum system takes a dump, I'll certainly go that route. At that point I'll probably wish I hadn't waited, but it's tough to fix something that ain't broke (yet). I see a couple different ones on-line, but this one seems to be the original: http://4x4posi-lok.com/app_dodge.html Saved in my favorites. If there's a better system out there, please let me know.