Here are the tear down instructions:
http://www.marlincrawler.com/docs/470install/470install_2.html.
Once you get it down to the reduction housing, just put your top shift rails in in place of the forward shift rails. Bolt a new shifter seat, gasket, and metal plate on to the top, and you should be done. Take your T-Case out the night before, and start early in the morning. You should have plenty of time.
