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That depends on which MRAP family you are talking about. Ours had C18's with full time 4x6, part time 6x6, and air lockers in both rear axles.

Make sure to check the clearance on that tubing for the lower radiator hose and that filter mount on the passenger side of the engine. With the engine offset to that side of the truck it can create clearance issues, common problem with those that have swapped in more powerful 855 series engines...

All this talk of chrome has me thinking of the latest Mad Max movie, Fury Road haha.

Making good progress.

How bout complicated, 3 stick shifting! haha https://www.youtube.com/watch?v=8lEYaTvvq4g If you watch the video in the link I'm pretty sure he's driving a 13 speed and throwing the main shifter around way more than necessary. His shift levers are left-gear splittler. Middle-main shifter...

RT=Roadranger twin countershaft RTF=twin countershaft with forward mounted shifter RTO=twin countershaft with overdrive RTOF=twin countershaft with overdrive and forward mounted shifter RTLO=twin countershaft with low and overdrive RTLOF=twin countershaft with low, overdrive, and forward mounted...

correct. That's exactly what was done to a m818 in the thread link. I had been planning to do the same thing to my m816 but the tcase pto is different on the T1138 than my T138 and those PTO outputs are pricey.

T1138 is .73:1 in high range. The Allison auto is 1:1 in the m939 series giving a final top gear of .73:1. Spicer 6453 in the m809 series is .78:1 5th gear, 1:1 high range tcase giving a final top gear of .78:1. Not including axle gears. Thats why with the same size tires and same engine the...

Most of the Eaton Fuller 13 speeds have a 12:1 first gear, which is deeper than the 'ultra deep' 10:1 reverse gear that your Allison MT654 has. For reference the 5 speed Spicer 6453 in the m809 series is a roughly 6:1 first gear. Video of my m816 going up a hill at 600-800rpm, 1st gear low so...

Nice find. That's similar power numbers to the older Cummins 400 big cam. Since you run empty most of the time the motor should live a long life. The 'short life' of those is what, expected for 300-400k? The engine computers are usually voltage specific. Other than that the engine electronics...

Big Cam, ISX, 60 Series, what's the plan?