Can't say as I have heard that term. More likely it is one of the codes that the vehicle may have been held under. Often, if a vehicle was being held as national stock, or as controlled cannibalization, the two letter code could be stencilled onto the vehicle. I am not familiar with the letters BM, mind you, but then again I have been out of the EME system for a number of years now.
I can see the heater deflector box in the photo, so the heater would have been installed at one time or another. How can you tell it's missing Jon?
There are a couple easy ways to tell Cdn two from Cdn 3. Are the hood hinges slotted to allow removal of the hood (Cdn2) or solid (Cdn3)? Does the rear axle have the little hub caps in the center (Cdn2) or is it a flatish one piece axle (Cdn3). Lastly, if you look at the frame just over the front mounting points of the rear springs, is the frame an open C channel (Cdn2) or are there a couple 6" plates boxing the frame in this area on both sides? (Cdn3). The earlier Cdn2 were prone to cracking in this area, so this was an improvement when the Cdn3s were being assembled.
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