I was wondering the same thing............I've been debating about putting one on my K-20 as well............I was also thinking about a Ranger OD from Advanced Adapters, but that would require a tranny/t-case move 6" or so to the rear of the truck, which would require driveshaft work(No biggie) but I don't think the SM465 shifter would clear the bench seat, and the t-case shifter would be iffy.
I would just like more splits for the gears I currently.
I seen a Dana splitter on ebay acouple years ago for $400 which is what the Ranger is patterned after............I am STILL kicking myself for not clicking the "Buy it now" button.........I imagine most people wouldn't want them since it is another stick to run, but having been raised around old Macks with Du and Tri-plex's it doesn't bother me