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Think about airing down when driving in sand and snow, 10 psi or even less. The large foot print reduces the pressure per square inch to that of a man walking. Bias ply tires are more forgiving aired down and let you drive on side slopes if need be.

If you plan on using the truck next day or whatever in cold weather, it starts almost instantly if you start and run it every 4 to 6 hours, depending on how cold it is. Idle it at 1,200 rpm or so, long enough for the batteries to be fully charged, say 1/2 hour each time. Has worked well for me...

I' have had the Hewitt for now going on 8 years and it has performed perfectly. Installed the dual set...

Some rather unique features of my 1969 xm757. Projects to keep me busy: PRC-77 radio, Stewart Warner coolant heater, Benmar personell heater, NiCd starting battery and NiCd "house battery" (for heaters and radio, DC-AC inverter and accessories).

Has anyone used the fuel burning coolant/oil pan heater? I have mine plumbed in, but never actually used it.

Good to see your post, David.

Tires for this series of trucks with the military designation"16-20" (about 405/70-20 metric size), were very much part of the overall design, providing low unsprung weight and low center of gravity. Low pressure, 30 psi on-road, (10psi, off road, including side slopes) low aspect ratio (70%)...

A few images showing the path of restoration of this 1969 xm757 vehicle: More to come...

One small correction, the "HI" is locked out during the start sequence. It is hardwired into the control box.

Yes, the LDS465-2 pistons feature 5 rings. The engine is built for slightly higher rpm (max 3,100 or so) than the earlier multifulers. The automatic shifts at 2850 rpm.

Very difficult to find...here are a couple of images.

More images of the xm757 axles. The front axle is FM210 RDAX5 Rear axle; M210 RDAX2 Axle ratio: 6.40, no lockers The xm778: FC240 RDAX1, ratio 6.72, lockers (according to dash controls) The two air lines on the hub of the xm757: service brakes and pressurization

Compared notes with Andrew and the tires are indeed the same as on the m656 series (xm757). While on the subject of rare vehicles, the tires were also tested on the Lockheed Twister:

Yeah, and they are pressurized for fording plus no brake fluid...all air operated and designed for the life of the vehicle.

Here is an inside view of the drum brake (they can be serviced with the wheel in place, btw).

No, the 5-ton xm757 is a very different creature... The tires look the same, but the xm757 ones are low profile and should really be marked 16/70-20 for a 70% aspect ratio. The brakes on the 757 are 100% air, I'll get a few pictures in a minute...

Got a couple of the tires mounted. There is bead damage on the two remaining ones, so I'm trying to figure out the best way to fix this (I don't want to use inner tubes).

Thanks to Ferro's alertness, my 757 gets some much needed rubber. He spotted the NOS 16-20 tires on craigslist. Thanks Adam!

Good road trip! Did the same thing with my cranetruck back in '06, but in the opposite direction. The K-boom came in handy more than once. Some images. The bed for your truck was made later that year as well (Black locust). Have a great little adventure! PS. The open cab (Bikini top) kept air...

Two choices IMHO, the 356 gets the filament lower for better illumination of the instruments.