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Tom Endy is right, I believe. I have a Fordor 1930 and used to cruse at 50 mph before installing my Mitchell 26%. 50 mph with a 3.78 rear end gives you about 2200 rpm. The 26% OD will give you 63 mph at 2200 rpm. That is fast enough. Any more and the engine labors too much with any incline. On the expressways, if I try to not hold up traffic , I can cruise all day at 65 and I still have enough power to climb gentle hills. A 36% will give you only 5 mph (68) at 2200 rpm and the stock engine with a 6:1 HC head will disappoint you at 36%.