I'm currently running around 100:1 with W56a tranny, and dual cases with 2.28 low and 4.88 axle gears. It works very well, and I'm happy with the set up. I am however needing to do some tranny work, and since I'll have it all apart, I'm going to put a Marlin 4.7 gearset in the forward T-case. The math says I'll have about 256:1 with that set up.

Erik