Mine (we assume is the original) currently has 16 teeth on the outside, but this one from "The Filling Station", that includes 1946, has 18 teeth. We can't find any with 16 teeth online and, since the rest of the differential is already rebuilt, it's not practical for us to scrap it and start over.

Can anyone advise as to what will jive with what year/teeth/tonnage of truck?
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1946 Chevy
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You can't buy happiness but you can buy a truck ... and that's pretty much the same thing.