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If you find a pass through 9" post the link here, I did a cursory search and came up with nothing. Of course there are other ways, I think some transfer cases can be set up for dual rear output IIRC they were the early Dana units.

You may have trouble getting 2.56 gears for the 9" and before anyone gets the idea they need to go to 9" just for the strength alone the 8 7/8 AMC 20s are almost as strong as a 9", certainly not worth the effort unless you wanted to do something strange like tandem axles. If it helps as I have...

It will be a challenge, I was going to ask how you plan on driving the rear diff, there are not any other diffs set up like these that I have seen with drive flanges mounted directly to the housings. but I am sure there are others out there. In the video above they say 9" diffs so that would be...

Yes, the gear hubs are 1.92:1 IIRC But with the 37" tires the end result is almost identical to my one ton with 3.73 gears

The diffs are AMC 20 which are larger (8 7/8") than the GM 12 bolt so they are pretty strong, 2:56 will be lowest ratio you will find. Not sure how adding an axle/diff will increase towing capacity, the HMMWV T cases are full time FWD so you are already sharing the load on two axles and the hubs...

Basically the 3 speed trucks are 2.56:1. the 4 speed trucks are 2.73:1 and the turbo trucks are 3.07:1 there are exceptions of course. So if you are going to do an engine/transmission swap anyway it is best to start with an early M998 with the 2.56 gears IMHO I have a 92 with a GEP turbo and a...