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So, after reading the Eco Direct post…0.78x3.07x450 rev/mile = 1078 engine rpm at 60 mph in 7th… It might get rolling decently using 1st all the time. I think Caterpillar might not approve of running the vehicle up against air resistance max speed at that low rpm might be called lugging...

I guess with 3.9 the transmission would hunt between 5 and 6 a lot. I will check the site out of curiosity.

Remove the 2:1 at the hubs? Sure, with just 3.9s and 46s under 1400rpm at 60 mph. If it even would have the power to go that fast. But worthless going uphill, or with 8000 lb load, and especially on any sort of rough slow going. 3.9, 3.14, and 2.87 total gear reduction would all work great if...

Acela quoted me $25k a couple of years ago installed in a FMTV, but I have very good reason to believe one can get the part for <$10k. I know whenever I mention lack of low range in FMTV people ALWAYS retort “torque converter”. But I have 53 years driving 4wds in general and 17 years driving a...

I have never driven a FMTV but, I have Unimog U500 camper (similar weight and power). IF 2.87s (5.75s?) are still available, one could add the Marmon-Herrington 1150 TC, evidently designed for the rear of the 3700SP. It has a 2.47 low range, same output yoke locations (except for a few inches of...