I've thought about going to duel cases some day.
Like I said I have the 4.24:1 gear set.  Which is great for crawling over obsticals.
But, when I'm just driving down the trail I wish I had my stock low range for the easy stuff.  Now I have to stop, shift to low, get over the obstical, stop, shift to hi, them get going....
Also, I like to run in sand.  The 4.24:1 is too low for sand.  When I have the stock low gearing it was perfect.  Right know I'm able to do just about anything at the dunes in 2wd with the rear end locked.  There's one hill that the only way I can get over is in low, 4th gear, and over 5,000 rpms.
And finally there have been times I wished I had just a little lower reduction.
So I'd like to have a stock geared tracker case bolted to a sami with a 4:1 gear set.
Then I'd have a combo of:  2wd |removethispart|@ 2:1, 4wd |removethispart|@ 2:1, 4:1, and 8:1.