A gear swap is mainly for off the line acceleration and I have to be honest and say that if you regulary drive of 75mph, you are probably best keeping the stock 3:27's. A gear swap would really help your car's performance, but w/ a four speed auto driving over 75mph, the 3:27's are probably perfect for gas and passing power. It wouldn't be worth it to step up to 3:55's, maybe a tenth, but a tenth isn't worth the money of a gear swap.
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