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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...

You want a FMTV to drive on the interstate at 75mph? That’s not what they’re for. Think about the planetaries; the tires exploding; the fuel consumption. From my perspective these things are for bad road camping vehicles or whatever. 60mph on the highway is more than fast enough. Yeah fast...

5.733 x 6.93 1st gear times tire diameter correction factor for 395s vs “standard” Landcruiser diameter 31.9” comes out to ~27:1. Not good, ignoring torque converter factor of ~2:1. That is why I continue to dwell on low range possibilities. The vehicle is physically large, heavy, underpowered...

Please forgive these questions, but I don’t spend much time on this forum. However I am highly knowledgeable re mechanical engineering, military vehicles in general and know a lot about FMTVs - but not everything. 1) Is there a 2.867 diff gearset in existence, intended for MRAPs, that will give...

Thanks, but those characteristics are similar to my U500 camper, about 26k lb, 11’9” high, etc. But I have been in several situations where diff locks (when you’re actually stuck one wants rear AND front), CTIS and low range were needed. Working gears in the U500 are 5.76:1. Admittedly 1st is...

I had Acela look into it. The actual low range is 2.47, high still unfortunately 1.09. It needs to be built by order. $24k. I don’t own a FMTV but have read the manual. The “Mode” button locks the center (and rear power splitter interaxle diff if 6x6) and allows selection of 1st gear, right? 1...

IN

You obviously know a lot about Unimog, but they have coil springs... Charlie

I actually said I did NOT want a soft ride, but after discussions with them (after I had received the shocks and installed them and determined they weren't going to work) I discovered the appalling lack of understanding of suspension physics that they seem to have. It was not confidence...

Whatever you do don't buy a set of Road King 3" shocks. I ordered a set for my 13 ton Unimog camper, told them the weights, sent them the spring deflection graphs, told them I "wanted it to ride like a BMW" (i.e. valved stiff). They used the lightest valving and they were USELESS, like no...

The only external difference will be a thin air line going to the differential housing, otherwise the axle will be identical. I doubt a Ministry of Transport inspector will even know it is an aftermarket diff lock, all European military vehicles that are worth anything have them from the...

Depending on tire type those kind of speeds could be very dangerous. With XMLs or XZLs blowouts can occur at speeds >60mph particularly if axle is heavily loaded and/or inflation even a bit low. My Unimog has XZLs (I have switched to XZL+ in the rear, they run a bit cooler). I have up to...

The MH T30 has a high range of 1.09, low range 2.247 http://mh.dfl-studios.com/oem/t30.php So to get speed back in high range 14.00R20s could be used (along with 6.14 high speed diffs). I don't know for sure if it would even bolt up to the transmission. Charlie