It appears there are a few different options, and please correct me if I'm wrong:
1). have a custom CV driveshaft made for your LMTV, and it will reduce your likelihood of having a problem, but not too terribly much better off than stock configuration with a stock driveshaft in specs
2). clock the rear axle up 2-3 degrees,
3). replace the rear axle of your LMTV with the intermediate axle from an FMTV (fabricate new mounts, new driveshaft, lock the solenoid in the rear differential, and what to do with the spinning output yoke?)
4). 3rd member from FMTV intermediate axle into stock rear axle of your pre-2008 LMTV? I ask because BRYCE has high speed gears in the following options (complete front axle, complete intermediate axle, and intermediate axle 3rd members only).
5). combination of 1+2
In a different posting, largely guided by steve6x6x6x6x6x6x6x6x6x6, it was mentioned that the intermediate axle 3rd member commonly fails if left engaged in the 6x6 configuration; is that just too much fighting between the axles, or do the complicated nature of the intermediate axle reduce the robustness?