The hood is different too. It has deeper fenders; the top of the wheel arch is roughly in line with the centre of the headlights on this hood but is much closer to the top of the headlights on the shallower hood. I don't think this is down to R or RD series because I think Mack changed the R700 design sometime in the mid 70s so all R700's from this point had the raised cab and deeper fenders. I've attached some scanned spec sheets for a 1970 R700 and a 77 R700. The cab height above frame is 61.3
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