my roommate's sammy has toyota axles and a samurai t-case w/ a 4:1 kit. it already had the 4:1 kit when he got it, and the toyota axles came with it in an all inclusive trade for a set of 37"s. there are available 8:1 kits for sammy t-cases. only downfall is that they have little motors.....UNLESS....you go to the junkyard and pick up one of these for $900 (this showed up about 3 hrs ago). its a 2003 w/ 903 miles on it. 24 valve DOHC Fuel Injected 2.5L V6 to replace the worn out 1.3L 4 cyl his sammy has now. engine swap is evidently the easiest way to go from manual to automatic in those things.
btw, that $700 sammy is actually $1300 to include the other engine. $1000 for just the sammy would be bad...$850 would be better.