http://www.usgear.com/dual_range.htm

http://gearvendors.com/4x4.html

https://eshop.advanceadapters.com/c...category_id=1198&czuid=1131510062250

You are looking at $2500 for the first two, $1500 for the Ranger. You will find that ALL overdrives are expensive, without exception.