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If you are referring to underside meaning the chassis and floors then I wouldn't call it slop gray but semi black. Looks like somewhere in the spring of 68 Dearborn switched to black instead of red oxide. Earliest I've heard of is May build date. I've seen a late May coupe a mid July fastback and my July vert as black. It popped up for discussion on the CJ forum last may that looked like Dearborn made a switch.
So what is the predominant color for 68 Dearborn? SGB?