Looks like an old CDF Model 15 (CDF = CalFire = Cooling Down Foundations)
Myself, I've been looking for an older CDF Model 24 or 25 (the 24 is the 4x4) that would have had the DT466. The cab profile lends itself just perfectly to having a pickup bed attached to make a pre-Navistar MXT conversion.}
I do not have many on my phone and am not at home but here is a side view. Truck has a 20,000 pound pto winch mid mounted with rear fairlead, two PTO drives, and in its first life was used to set power poles for power company. Here is one more bad pic. It is a 4 speed 345 CID internation engine with 6.17 gears. Currently has single wheels with 37x12.50 super swamper tires. The old dually rims were dangerous. That is a 9 FT plow.