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I think that the usefulness of the double overdrive is entirely dependent on what the rearend gearing is like. A double overdrive box would allow you to run a 4.11 or numerically higher rear gear, but in 6th have it reduced to an effective 2.05 or so. Also not all boxes are a double overdrive, in the richmond gear 6 speed 5th is the 1-1 gear, 6th a .70-1 gearing. Robert
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