True, trackick tcase gears will only affect low range only, where as samurai tcase gears (if you decide to swap in a samurai tcase) will lower both high and low range. And, as mentioned, samurai tcases have a 1.409 high range reduction in them stock.
One thing to note, with a samurai tcase swap....since the reduction will automatically be 40% in high range, that means you will need to run a 40% taller than stock tire to be at the same engine RPMs at any given speed (so say stock tires are 27" tall, that would mean you would need a 37.8" tall tire to be "geared" the same as with stock tires). Generally, a samurai tcase swap into a trackick is not feasible, unless you are running 35"+ tall tires, or you don't drive on the road at high speeds. Of course, you could always run a higher (numerically lower) axle gear to compensate for the overgearing of the samurai tcase, but that is more work/more $$$.
One other option (instead of swapping in a samurai tcase).......
If your trackick is an auto, it will have 4.62 axle gears, so you could swap in some factory 5 speed gears (5.12s) and that would help get you back to a stock gearing ratio (won't quite be enough, though). Ideally, the 5.62 axle gears would be a good swap.....but they are very hard to find and generally big $$$ if you do find some.