Well, im getting into a project... Its a 1984 GMC 4 door long bed 1 ton, It has a dana 60 front and 14 bolt rear end. Im unsure of the lift is has. the front is 47" with 5 leafs and the arch has 9 1/2 " of arch ( off the truck) so im assuming it has 8" or 10" if lift. I think it may be a 8"...