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Oshkosh 30000 is an underdrive 1.26 to 1 unit. Single speed 55000 is a .98 to 1 high so it has some overdrive. 2.77 to 1 low range 7 ton has a double overdrive allison. The oshkosh case would allow better rpm at cruising speed

You won't get more than 7 or 8mpg period

For what a 60 series cost. Plus that cost of a 15 or 18spd, plus a stronger transfer case, cause the t1138 won't stand up, and all the crap to make it work = alot Cheaper solution. Sell your 934 but keep the box. Buy a 7 ton. Swap the oshkosh 30000 series transfer case to an oshkosh 55000...

60 series are happy around 1800. The 916A1s used a direct drive allison and a .98 od transfer case on 44in tall tires and they screamed down the highway. With 4.90 gears. Basically with a double overdrive transmission equates to a triple overdrive setup with the T1138 transfer case on...