Bear in mind there are 3 different tall 5th ratios; 0.655, 0.642 and 0.62.
I have the 0.642 in my GT5 as an overdrive gear and it works really well. As the Silver State is all top gear Mark could consider the 0.62 and keep the 4.22, a cheaper option that would provide for 169 mph at the same rpm as used by JFB.
Julian
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