There is almost no difference in the design of the working parts between a Vega and a 1941 and later truck box. They are both reciprocating ball design.
If your 46 box is in good shape, or rebuilt, it is an excellent box.
I have put 1941-46 truck boxes in 1939-40 trucks many times because they are such a good box, and a simple bolt in for anyone wanting much improved steering.


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