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How much are those axle gearsets running with the 4.88's? quckfarms he has a CAT 7155 trans in his m923 instead of the Allison. 1st gear is even lower than the Allison's reverse gear.

The 855 series engines in commercial rigs regularly go 700k-1 mil miles, or 15k hours in stationary units. That's the longevity I'm talking about and want yours to reach. They don't go over 2100rpm for long though in commercial use. Can the 855 series spin over 2100rpm? Yep, but they are known...

Big Cams don't like regularly sustained over 2100rpm either (if wanting a long life out of it). Realistically no engine of that size likes being over 2000-2100rpm for long. The smaller engines like the 8.3L will last longer at those rpm's. Supposedly the tcase from the m916-m920 has other...

No. The T138 case is physically larger than the T1138. You can install an air switch to disable/enable the sprag on the T138 case. Would also be much cheaper than trying to get custom gears made. I have one that I pulled out of a m51a2 dump truck that I'll sell for a good price.