I too was surprised when I read the GVWR! But, 6300 lbs is what it says on the placard on the inside of the driver's side door. It is also what is says on the registration.

I just found the curb weight for the 1983 F-250. It's only 3,695lbs. I expected it to be higher.

Even though I still can't find a GVCWR, I need to figure out the gear ratio before I can get an accurate number anyway.

Thanks for your help.