Dltalfa,
Did a little searching on your u-joint issue. From what I have been able to see in available resources documents, it looks like your "crashbox" is from a vehicle earlier than '46.
1st picture below is a snapshot from a copy of a 1941 Shop Manual (original) that shows what a '41-'46 U-joint should look like (doesn't match up with what you have in your pictures).
2nd Picture is a snapshot from a copy of a 1933-62 Chevy Master Parts and Accessories Catalog showing what a '33-'40 Truck universal joint (lower one in the pic) looks like (matches your pictures to a "T").
3rd picture is a screenshot from a 1938 Chevy Car and Truck Shop manual that pictures (poorly) the u-joint and torque tube ball assembly and describes how to disassemble this earlier style U-joint.
Hope this provides some help on the subject.
Dan
