borderc, not 100% sure about the sammy, but I have a trackick and there is a section in the (back) of my chiltons manual about what parts you need and the process of converting the 2wd to 4wd. Also do a search around these forums and you should see something. i'm actually looking to do the same with my tracker, when the space, time, money continuum allows for it!

I can tell you though, there is a spot that needs to be welded, but I cannot remember off the top of my head what that may be.