1982 fleetside box weight?

[kcwis]

I have the box off and am replacing rear springs and want to adjust ride height by adding or removing leaves and it would be easiest with the box off, I would use sand bags or whatever on the frame to simulate the box weight, but need to know approx box weight,thanks

[fitz]

My guess would be in the 450lbs range.
That is just a quess.  Hopefully someone who has weighed one will chime in and let us know.