Technical Chevy pickup beds

Can anyone break down the sizes for me? Ive been looking for days and cant find a straight answer, I know my buddys 52 has about 49 3/4"-50" wide box inside to inside... and this bed is 48" wide
I know the beds are almost identical to the eye besides the tailgates and fenders of course those are missing on mine. Can anyone help? Also, pre 40 beds? How can you tell?

 

That looks like my 46 long bed. Here is a link to a GM site that will give you dimensions for each year, should help you figure it out. Vehicle Information Kits | GM Heritage Archive | General Motors

 

Tons of great info there! On every year except 1940... sadly thats the only year with no pickup bed specs. Looks like 41 is 48.5" wide inside by 47 they were wider, so my bed is in the ballpark

 

Early 47 were the narrower Deco trucks that were the same from 41 to first series 47, second series 47 is the first Advance Design truck. 47 second series through 53 are 50 inches wide on the inside.

Mar-K lists bed parts for 41/46 but doesn't show measurements. https://www.mar-k.com/

 

Reason I am so curious about 40's is I just acquired a 40 cab and front end. I have the bed I posted the pic of above and was just curious if it could possible be a 40. It at least appears it could be a 41-47. It will probably fit fine anyway was just curious

 

A friend has a restored 39/40 with the different width bed and rear fenders, but I don't remember which year is which. I know 39 and 40 had two different widths, my memory on that is currently foggy.

Edit: looks like 39 is narrower with wider fenders. https://www.jalopyjournal.com/forum/threads/1946-chevy-truck-lon-bed-dimensions.1142820/

 

1940 chevy truck beds are 48" wide and 39 is 45" wide. 39 rear fenders are different than 40- early 47 fenders. the rear fenders are 1 1/2 inches wider to make up for the bed difference. the cool trick is to use 39 fenders to get a wider tire under the truck. the problem is that 39 rear fenders are pretty much impossible to find in any condition. i have a thread on here about identifying 39-46 trucks. it might be helpful to you.

 

Perfect answer! Could you link the thread? I searched pretty hard but must have not used the right wording

 

Perfect, thanks Mark!