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You can search some of the older junk yard for some mack toploaders that will have a power divider option on them that will swap into the 5 ton axles you have. You would just need to simply match the ring and pinion ratios to the others on the truck. Certain units share the same ring and...

They are all 6.44s. A 939 series dump truck will cost you 13 to 25,000$ respectively

You can modify the sprag air with a TR1 valve on the dash. There are threads on this. The rear probably has both open diffs. They work together. Lockers in a dump truck is rare unless added by someone..

5 ton and up tm section is where you want to start listed as m809 series trucks. two group 31s will do fine. The rear two axles pull all the time. There is no interlock like civilian heavy trucks. The 6x6 works thru a sprag operation in the transfer case. You should hear an air clunk when...