Very interesting! That makes perfect sense on those heads being that small. The last true 413 industrial I saw was in a 1971 LCF 800 tandem drive axle coal hauling truck with a five speed NP540 and an SM-465 cased three speed non-synchro compound behind it. I can’t imagine what it was like (honestly it’s more that I just don’t want too!) shifting both sticks on some of our 10+% grades out of the pit or 8 percent mountain grades with the typical overload (packing coal in the bed with the loader bucket and the loader bringing the front wheels off the ground) during the coal boom here around that time.
