THought it would be worth mentioning that if you wanted an underdrive in front of the stock superselect case [color:"red"] YOU WILL NEED AN SAS [/color] the reason for this is that the torsion bar crossmember will be in the way for the large mitsu case.


Having said that you could go with a double NP231 like Nathan C or a doubler and a gear driven case.

As for 2 speed T-cases I think 3.15 is the perfect all around ratio for doing everything.

4:1 is good for crawling but sucks for trailing when you need more torque but don't need to drive 5mph (hills, ruts, sand, heavy loads ect.)

3.15:1 can crawl but you'll still need to give it some throttle at times and if you get really deep they can stall (or torque converter slip) They're ok for trailing but if the terrain varies a lot you can find yourself stopping and shifting frequently

2.7:1/2.8:1 is awesome for trailing, you get good torque in the lower gears and can still get to good speeds between the rough stuff. Not so good for crawling unless you're rocking 31's expect to stall even with a big motor like 3.5.

1.9:1 stock. Is good for trailing around and high speed dirt, there is no such thing as crawling with these gears.

Now many an Az Crewer hits the rocks with 1.9 and 2.7 T-case gears, they just do it at a higher RPM. Much entertainment follows <img src="/forums/images/graemlins/lol.gif" alt="" />


Even if you don't rock crawl you should consider a transfer case regear, lower gears = less shock loads and longer lasting parts. Once regeared your capability goes through the roof, lower RPM = less wheel spin and more traction. In my opinion I would do the transfer case gears before the big tires and before lockers.