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My favorite gear is the 3.91. However I did take the 5.13s out of the dart and put in 4.88s. I think that's just a Jim Dandy Street gear. We'll see how it runs with them and probably switch out to the 4.56s and try them for a bit.
I don't know everything about your engine, but you over gear it, it will slow down. I pulled 4.30's once for 3.91's and the ET/MPH stayed 100% the same, behind a mild 360