Winch compared to derrick version
Take the following with a grain of salt since I haven't seen a real live derrick winch or body. The set up of the winch, and it's drive, on this truck would take up a lot of space/length in the body that would be wanted for other things in service. Similar winches were built with the chain sprocket mounted right at the gear case. The whole winch mount resembles the rest of the truck, seeming cobbled up from what was to hand and not showing solid design. The thread on 3 Ton Derrick Trucks does show a photo of the winch assembly that seems somewhat different from this one, even allowing for the absence of the capstan on the shaft end. On the whole I am doubtful of this winch being from a derrick truck and suspect an adaptation from a civilian source.
I hope I'm not insulting a member's truck.
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