Okay. I've figured out that the box and my tailgate are likely 41-46 era. My question is this:

What are the frame differences between the 39/40 and the 41-46?

Mine has the correct 123-3/4" wheelbase. Did the wheelbase increase when the cab got bigger by 2" for the 41-46 series?

Is there anyway to tell what frame is correct for each series? ohwell

Thanks!

If it ain't broke, take it apart and figure out why!
39 Chevy in the Gallery
Photobucket Album