the frames will swap, but there are differences. the CJ frame will NOT have the bolt holes for the spreader bars that go from the roll bar to the windshield frame, and the glass is different. I don't know for sure about the hole for the glass being different, but the attachment method for the glass is different. the CJ's use a rubber gaskt that goes inside the windshield frame hole, and holds the glass. on the YJ's, the glass is glued into the frame(on the metal, on top of where the CJ gasket would go), and then a "trim gasket" is placed over the glass.
maroon 1987 Grand Wagoneer. stock for now...