I'm pretty sure that I used point B for the base point of my measurements.When it gets light, I will go out and confirm that. Lumbersawyer gave you a measurement on his 3600 from Point D to the hole that's in the angle strip, so you could use that hole as a base point for your measurements. The two attached pics are the basis for my contention that you could use the 3100 measurements for your 3600 bed, as the 1951 Vehicle Info Kit shows the measurement from the rearmost point on the bed (your point D) to the rear wheel center to be very close (just 5/16" difference). The only rub might be the attachment of the running boards to the rear fenders. I would use lumbersaywers location for the bolt he measured as the base point for the rest of your measurements. That should get you spot on.
Kevin 1951 Chevy 3100 work truck Follow this saga in Project Journal Photos 1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car) Busting rust since the mid-60's If you're smart enough to take it apart, you darn well better be smart enough to put it back together.
