Good evening all, I'm trying to figure out the quantity and locations of the cross sills. According to the research I've done the '40 long bed has 4 cross sills(Front sill, 3 center and the rear cross sill)... so I seem to be missing at least 2. I'll attach a picture of my bed for reference.
I am also unsure of the purpose/function of the brackets in the last 2 pictures.
Those brackets look like they're at the cross sill location with the long bolts going thru the cross sill vertically and horizontally. I doubt they would help much in squaring up the box though. Just a WAG, for sure. As far as number of cross sills, there would likely be one at the location of each of the vertical long bolts. But that's just another guess on my part. The guys at Mar-K can definitely tell you how many cross sills you need and could probably shed some light on the purpose of those brackets.
Kevin First car '29 Ford Special Coupe #2 - '29 Ford pickup restored from the ground up. Newest Project - 51 Chevy 3100 work truck. Photos Busting rust since the mid-60's