The problem with the toycrawlbox is that it's designed higher in the drivetrain, therefore it's designed less ridged, because it has no need to be more ridged. For example, part are designed in a pecking order of strength, tranny-tcase-diff-axles a Toyota tcase input is 21 spline, an output is 27 spline, usually pinion gears are 27 spline, then axles are 30 spline with every gear reduction you are putting more stress on parts and woul require stronger parts, a 21 or even 23 spline crawlbox wouldnt last at the end of a 30 spline axle, not to mention the housing itself
That is very good to know and think about.
Thanks for the responses! This is really useful to figure out what direction we should go. Keep 'em coming!
What do you think about optional gear reduction? That is, you could order them with a gear reduction of some amount, or, if you're already geared down, you could get one with a 1:1 ratio, and use them more for the ground clearance.