I don't think they were solid wood. I Reciently sold my '86 stepside about 2 years ago, (regrettably) with the original wood bed. from the fender wells you could see the layers of laminate.
Some called it Marine plywood?
I have an 86. When I removed what was left of the floor it was plywood. The guys at Mar-K told me that plywood was what Ford used in the floors from the factory.
I replaced mine with pressure treated plywood painted with POR-15. Then put a bed mat over it. It's a daily driver not a show truck.
Mine was to badly rotted to tell. I think it was 2 pieces. Not sure though. I did mine in one piece down the middle and then filled in the corners. Unless you take your bed apart I would suggest doing it in 2 pieces. That single piece of 3/4" plywood was heavy and hard for me to handle.
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