There was a time when 3/4, 1 ton srw. and 1 ton drw shared most all of their components. It was easier for the manufacturer to build them when this was so. That mean't that it was pretty easy to do some swapping of parts to upgrade a truck to a higher capability model (the sticker of course never changes)
Nowadays with just in time supplies to the plant, this may not always be the case. With everything computerized, a part that may save the manufacturer 50 cents can easily be supplied just in time for that 3/4 ton in production vs. the 1 ton version . I think it can still be done, but one has to be more careful about it.
Even to the point of studying part numbers to see where they differ.
