I don't know. Footnote (3) says the 2.043/1.468 "gearset offers nearly identical rpm drops between gears, so-called 'Geometric' spacing." That sounds like the way to go. Some of the ratios are favored by road racers. You can call them and discuss it. Our local Pontiac club took a trip out there to Autogear and we spent a lot of time discussing transmissions. They seem to know what they're doing.