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I had the same question. So I went back to the dealer and he printed me out a "VIP Summary Report" which has every option that is on my 2006, 2500 CTD.
no, the G56 has shorter gears so when you are in 6th you are running a .79, my NV5600 is running a .76(I think) so when it comes down to it my NV5600 with 4.10's is turning the same RPM's as your G56 with 3.73's
My 1st Gen 4x4 CTD has a small metal tag bolted right to the differential cover plate with the axle ratio stamped into it (mine is 3.54.) Most diffs I've seen do as well.