(manual shift T-case) diagram of the transfer case, and shift solenoid?

anyone have a large format T-case, and T-case shift mechanism diagram? looking to see if it is possible to manually shift the T-case (for field rescue/trail limp out). I wheel in some pretty remote areas, and would hate to have my shift mechanism fail and be stuck in the middle of nowhere with no cell reception, and limited radio/CB listeners. does anyone make a manual conversion? all i've seen is the topshift T-case that Marlincrawler sells in their doubler 2.65/4.7:1 systems (drool!!) I understand that the electronics might not function correctly (4wd computer) may go haywire not seeing signals, but at leas it could get me out of the woods... thanks.