Santerre, yes, the six bolt rims with the spokes. In the case of this Howe pumper, the trans has normal band brake drum on the back .
A short driveshaft to the transfer case drives the pump, which disengages the rear end at the same time , as you say.
This results in the odometer clocking miles while pumping, so there are actually a lot less than the indicated 5620 miles showing!
I would think this truck, if sold for over the road use, would have had a two speed rear end pretty much standard equipment?


~Charley
1954 Chevy 3100 with 235
“Bud”
Follow along in the DITY
1963 Chevy half ton stepside short box 230
1954 GMC 3 ton 302
And several more Chevy camper and work trucks 1979 1987 1996