Joker,

I'll see if the 1947 manual is now listed at the GM Hertigae site; however, in 1948 (the link you gave) 2-speed axles were available on all 1.5 and 2 ton trucks.

Big Pink might need better detective work to distinguish between 1.5 and 2 ton?

http://chevy.oldcarmanualproject.com/chevyresto/4880.htm

Tim
1954Advance-Design.com
1954 3106 Carryall Suburban
1954 3104 5-window pickup w/Hydra-Matic
The 216 and early 235 engines are not "splash oilers" -- this is a splash oiler.