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I just replaced a 55 gal. tank with M939-series 58 gal. tank. So, I have an extra filler neck of type you have. PM me if you are interested in it.

Looks right to me. That's how mine was when I got the truck. You want flexibility there due to engine vibration, so don't weld the two brackets together. Mine made an awful squeak at idle. I ended up changing it to what you see in the pics below. I used a vibration dampening sandwich...

Oh, and, pay no mind to that metal cancer on the rocker panel :oops: ;)

Once I get the batteries installed, I will pull the truck out of its space and get some better side photos. The guy who rents the space next to me, who is never there and has a big fat RV, decides to show up right at the time I want to do this project. Needless to say, it was quite the challenge...

Once the box was mounted in place, the bus bars and Solargizer circuit box were installed. I made sure to mount the Solargizer box so I didn’t have cut or add to its wiring. The main positive cable was a little long, so it was cut down, a new lug terminal was swedged on and some new red shrink...

I removed the existing battery box. I also removed the two bus bars, all cables and the Solargizer box from inside that box. All those accessories would be reused in the new box. As a side note and on the same day, I also installed a "new-to-me" M931 58 gal. fuel tank to include some new...

After getting the box home, I gave it a quick cleaning, removed the accessories (hold-down, wood liner, slave receptacle) and put a nice coat of 686 sand on it. While I was painting and prepping the box for installation, I found that removing and replacing the cover was a little bit cumbersome...

About four years ago I modified and installed an M939-series battery box up grade on my M818. It is a very sturdy, modular design allowing easy access to the batteries. In addition, if you use only two batteries, it lends to more storage space. It did come with some drawbacks including hanging...

The intimidation factor goes away once you start working on them.

Welcome! Nice find and I'd say it fits like glove [thumbzup] Stock up on the Motrin and Ben-Gay. Your achin' body will thank you...heavy parts on this big beauties ;) I have second thoughts once a month when I pay my storage fees. But, my truck is like another kid to me. So, I keep him.

Yes, Sirs! That is my G scale Union, Southern & Santa Fe Railway. When I am not dumping money time into the truck this is where the balance goes. I am not a cheap date ;)

I installed a new (to me) 58 gal. fuel tank from an M931 tractor on the right side to match the left one installed back in Feb '14. I also installed locking fuel caps on both sides. I removed the M939-series uprade battery box and began install of an M915 battery box. These are really nice...

Click on the link and the page specs out the plug. Part Target is your friend! ;) http://www.parttarget.com/5365-01-298-4877_5365012984877_12356772.html/-ede6708d-60aa-4bd7-946d-5feb737fc0b1?searchtext=12356772&searchoption=sku&originalsearchtext=12356772

The pics Castle Bravo posted (the one from Boyce?) when compared to an M813 put the amidships axle in the same relation to the fuel tank sans mudguard. The rear frame is only missing bumperettes.

Does the M815 share the the same chassis as the M813? I have noticed the longer frame overhang in the rear and, what appears to be, a single left side 78 gal. fuel tank.

It was definitely part of the M809-series of 5-tons. It was not a very common truck. Basically a military version of a logging truck. I have only seen them in TM drawings and photos. The photos were on Boyce Equipment's website, but are now gone.

WOW! Can't compete with that one!! Ah, but what the heck! Shamelessly submitted...

Most of the installs I have seen put the control boxes in the upper rear corners of the cab. That's how I made the decision to put mine where they are. It seems more natural to reach up slightly over your head to adjust the box than toward the middle of the vehicle while driving.

On Friday, I removed the driver's side window to replace the bottom lift channel. The channel was nearly rusted through. It pretty much fell apart when I was removing the window. It was a simple rebuild and much worth the effort rather than buying a whole new window. Unfortunately the rusty lift...

I mounted the AM-1780 with the large angle between the seats above the cab tub rear lip. The flat control box plates were mounted using loop clamps to the rear cab top support bows. I used two CX-4723 4 ft. cables to connect the control boxes to the 1780. The power cable ran down behind...