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Parts are readiably available for the rears in the M915-920 series truck as well as complete drum to drum units from wrecking yards. If it were my truck, I'd pull the drive shafts and axles and see if it's the center section or if the drums are rusted to the brake pads. Then check the transfer...

I used to run a Freightliner with a 475 Cummins, 13 speed Road Ranger, 3.73 gears and 12.00X24.5 tires. Maximum rpm was 2350 before the governor kicked in. There was a 250 rpm drop between gears. I cursed @ 80mph most of the time right around 1950 rpm when traveling south on I-85 to Atlanta...