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Dude it all depends on wahtyou want to do with your car. The steeper the gear (higher in nunber) the lower your top speed, the better the acceleration. Personally, Id go witha 3.55 and build the snot out of the motor, but thats just me. A 4.10 IMO is way too steep, for a BONE STOCK stang itll be fine, but for anything with some actual HP 1st gear will become useless (all tire spin), and on the highway the rpm's will be too high, for my liking anyway. To me 3000 or higher at 70 is unacceptable. Unneccassary gas guzzling and engine wear.
-P.
Sorry forgot you guys runnin 4.6.........those things have like NO torque. Kinda funny I ran a similar time to yours witha 3.27 gear I had 13.9@105 on street tires.
-P.