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I take my wrecker offroad in rougher terrain than that, it's really what the m939, m809, and m39 series trucks were built for. Lots of pictures in this link from a camping trip in a nearby area, pretty easy drive and I wouldn't hesitate to take a m934 out here either...

The military surplus 395's measure from 46-47" depending on which model.

Cam itself and possibly the crank bearings at those power levels. To a certain point you can get the fuel flow by using injectors with larger orifices and keeping the pressure at/below 200psi. Eventually though it gets to where the fuel is just being flown into the cylinder instead of a mist...

Helping a friend out with his MEP 007b generator. When you turn the ignition switch on and flip it to start the engine turns over, but no current is being sent to the fuel shut off solenoid, the 2 electrical fuel pumps between the main tank/first 2 filters, or the solenoid that is mounted just...

One sitting kinda next to my JERRV MRAP in Iraq at the mechanics shop. Picking up the JERRV after they had finished replacing the front axle/leaf springs (got airborne and broke the front end on the landing). All MRAP's are big, but the Buffalo is absolutely huge.

290 small cam? No it will have a short life if you try to crank it up that high. A 290 big cam could be built up to those levels but not a small cam.

Yea the stock horn on my m816 is absurdly high pitch as well. Planning to swap it out or maybe install a second horn with a lower tone

Not just the piston squirters. The older small cam 855's (like the NHC250) suffered from early cam failures when cranked over 400hp. 200psi of fuel pressure after the pump is reliably all the cam will survive. Compression ratio varies as well but not by much. Anywhere from 14:1 up to either...

For size reference, that is from a Buffalo MRAP. The top edge of that bed is 9ft off the ground.

What I could do with 535hp/1600ft/lbs torque+ in the m816. Drove a m915a1 with a m923 in tow the other day, combined weight is a little more than the wrecker. That 400hp would move pretty well. Averaged a little over 6.5mpg on that trip

Mr, I'm no sir I work for a living..... wait, not so much right now hahaha. This generation 5 ton, m809 series, only has 1 drain valve for the air tanks. Located underneath the driver step. That low drain/return connection will be plumbed into the stock tanks drain valve. The rear tank sits...

The big cam 855's can reliably make lots of power and last a long, long time. Small cam won't make as much power reliably but still pretty good.

Had the hood up today, not for engine work just to finish up installing the backing plate/air fittings for the brake pedal. Started off by swapping out the fittings and plugging off the unnecessary ports on the middle axle air cans. The one with my finger on it is for the service brake side...

Applies to every internal combustion engine.

Even with 395's (47") the tires can rub the wrecker bed, probably similar on the cargo/etc.

Out of curiosity, what are your EGT's at and for how long? Since these engines have been around in the 60's and 70's million miles has not been uncommon, including the small cam 250's. Military often neglects maintenance and abuses the vehicles which shortens the lifespan of mechanical...

How's the testing going?

The others already answered. The nice thing about making the fuel gauge permanent (not necessary) is that you can find out if you are having a fuel delivery problem. Whether or not these trucks were turned up before you bought the truck vary. On this forum people have found fuel buttons from a...

Those are 395x85x20"s on my m816 (47" tall). If you stay with military surplus tires the largest tires to run as duals and not be overwidth are the 11x20"s. Could run civilian tires for a 20" wheel or swap out to 22.5"s. If you are determined on the flatbed then cut it down to 12-14ft, long...

Someone elses build with a short offroad wrecker idea Military 5 ton wrecker (my m816). The M543 and M936 are the same length and use the same bed. It's a standard wheelbase 5 ton (same as the cargo), which is not much longer than the tractor/dump truck wheelbase.