I Can't find it right now but I ran accrose it before.
I THINK ?
On the vin. tag
2B is a 1/2 ton
3B is a 1 ton
4B is a 1-1/2 ton
I THINK all the cabs are the same but it was just the tag on the truck that was different?
Edit---- I found some info HERE
https://chevytrucks.org/1956-chevy-b...k-vin-decoder/
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