I got a 07 Mustang GT I was thinking of buying some rear end gears but i don't know which one to buy. I know that a 4.10 well get u a little better on a start. But my question is is their any differents in the highway becuase I like to go to my home town evey often and I like to drive fast around 110mph. Would it be any differents?
Gas mileage will be a little different. THe lower the number the better mileage you will get. And the 4.10s on the highway are going to put your RPM kinda high. Especially over 100 mph. Go 3.73 if you do anything at all.
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2008 v6 Pony Package. Performance mods: Aluminum Driveshaft, Screamin' Deamon Ignition Coil, Red Livewires... and an STS turbo kit with an intercooler,and water methanol injection.
5 psi~ 286rwhp, 331 rwtq
Other Mods: Window Louvers, 2 10" MA subs, 1200 watt RMS Hifonics amp. Tial 50mm BOV.
From everything that I have heard. The general rules to follow are
If auto go 4.10 all the way
If manual only go 4.10 if it is not driven all the time, otherwise 3.73.
for instance, I have an 05 GT that is a daily drive and I decided to go with 3.73's and couldn't be happier.
I say these general rules because I have known several people who have gotten 4.10's in their manuals but then switched them out for 3.73's
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My mod list finally got too long to post in my signature. I must be doing something right
2007 Mustang GT. 3.73 or 4.10 rear end gears? 
all motor now.Don't ask.
