Basically, once you go through the special shift sequence to get to 2-low going from right to left through neutral, the stick ends up on the left. At this point, straight up is 4-low, straight back is 2-low (IIRC). You can go back and forth between these just rocking the stick up and down, nothing easier or quicker.
Very handy is you have a front locker and armstrong steering
I have seen this but from the looks of it you shift from 2 hi to over to the low range rod and then into 2 low without ever going into 4wd and where i play I spend alot of time playing in 2wd low but as it is now I have to shift into 4wd hi then into 4wd low