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So if 230hp is not enough power to use the .65 OD in a motor home it probably won't be enough in a loaded m1079 if the final drive gears were changed from 3.9 to 3.55 or 3.07. If that is the case Has anyone turned the mechanical injection pump up to see how much it helps with a gear swap...

I found this useful as well http://www.allisontransmissionpublications.com/download.ashx?did=489 also anyone know what the 4700 series trans is used in? If it is the same housing maybe 7th gear could be swapped out for a higher od to the .64 vs the .78 to get better economy without...