1941-46 boxes are a fairly easy swap.
Your steering wheel is keyed to the shaft and 41-46 shafts are splined. You will need a matching splined wheel or cut and graft the 39 steering shaft to the 41-46 box.
1/2 ton through 1 1/2 tons use the same box but the 1 1/2 ton box has a longer steering shaft.
If you are grafting the shaft the 1 1/2 ton box is a good candidate if it is the easiest for you to find.


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