I own a 05' Mustang GT automatic and want to upgrade the rear end gears. I think in stock form they are 3.31. I'm thinking 3.73 or 4.10.
Would 4.10 be too much? I drive about 30 miles per day on the highway.
Other upgrades ar: SLP Loudmouth Axle-Back, C&L intake & Diablo Sport Tune, & Eibach Pro-Kit Springs