I managed to do this mostly successfully with 4.10s and 4.88s once. Never again. This was also on a wet-snow covered uphill where traction was indeed next to nil, so I gambled. The traction improved over the crest of the hill to decent fire road quality, and even with the closer mis-match of .1 to .88 the noise was ungodly once I did get it out of 4wd (still had ADD drive flanges so no unlocking the hubs first). Shifting on the fly is a thing of the past unless I'm under 30mph, and even then - it sure don't like it.
