Not many people will have a use for this, but Calmini will have a slip yoke eliminator kit for the transfer case soon:
Discussion @ N4W

For those that I'm sure will be asking, here's what an SYE is/does:
The factory setup has the front end of the rear driveshaft simply sliding over a splined shaft inside the rear of the t-case with nothing holding it there but the rear diff at the other end. This is called a slip yoke arrangement. As the rear suspension moves on any solid axle, the distance between the t-case and the diff increases/decreases by a bit in the process and the slip yoke slides in and out of the t-case accordingly, of course with some leftover length over the shaft inside so it doesn't disengage and/or fall out during normal suspension travel. However, should you significantly alter the suspension travel the stock slip yoke will not be able to move enough to accomodate it and the driveshaft can butt into the t-case (also stressing the diff flange) or fall out of it depending on how much the travel changed in each direction. That's not good.
A SYE setup puts a short non-sliding flanged end over the shaft at/in the end of the t-case. Of course, now there's nothing to allow for the shaft to shorten or elongate as the suspension cycles, but that's where a new 2-piece driveshaft with its own ability to adjust its length comes in. Our front shaft, which hardly needs to move in the first place since the diff and t-case are essentially fixed in position relative to each other (but the small movement of the diff in the bushings etc is enough to require it vs. abusing the bearings) is pretty much what it's like. You can have one built to your needs, not all that expensive.

This is very much a niche product so far, moreso than the crawler gears even, and I hope Calmini doesn't take too much of a bath on this. However for those that want to truly take their buildup to a new level with a super-flexy rear, this will be just what the doctor ordered.