TheShoer,
Am sure you know there isn't a lot of online readily available info on GMC trucks, especially those back in the 1930's.
Can you provide a picture of the data plate to help try and deduce what you have???
I did a bit of searching and found a picture from an old 1938 GMC sales document that seems to give a list of the offered Model #s, but "114b" wasn't one of them.
Could you be mis-reading the numbers? I found model#s "T14" (1/2 Ton) and "T145" (3/4 Ton) that could relate to the "114b", but without a way to see it for ourselves, not really able to help confirm.
This older thread
1938 GMC Serial # location may help you find what you are looking for.
Let us know what you find out.

Dan
EDIT: Wayne beat me to the posting button - LOL! Thanks Wayne - your info is probably a whole lot more helpful than mine