gears dont add hp, what they do is make the car have a better ratio to get it moving faster. the pros and cons of gears are with high ratio gears you will get less milage on the highway, but in most cases in city driving you get the smae or better mpg due to the motor not having ot work as hard.
the advantage is well more acceleration which is always nice. if its a stick i would go at least 3.73's if its auto at least 4.10's.
my buddy has 3.73's in his 94 v6 witha 2000 v6 with an ati procharger on it, it seems to be a good ratio for it. and alot better than the 2.73's that were in it.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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