The front axle was missing when I found my '40 Chevy truck. I used a front axle off of a '41 that I had, and not really having any reference, I put it together unknowingly.
The U bolts went over the piece attached to the shock arm, along the sides of the leave springs, then thru the holes of the axle, but were much longer looking then needed. So I put a small wood block between the leave spring and the axle. Is there a piece I am missing that goes there??? Can't find any reference on the web.