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i did mine at 84k and they were fine. i had a tune go along with it. gas, idk haha but power, u can definatly tell a difference (horsepower wise its none) but you can feel a difference, i love them
 

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Your car is 7 years old....Be safe get a bearing kit. I also suggest you use amsoil gear oil.

Your highway goes dwon 2 mpg your city goes up 1
 

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I had 3.73's in mine for about two weeks. on a mild N/A auto car their worthless, you wouln't notice much (if any) diffrence (I saw no real diffrence anywhere, street, track, etc with the 3.73's). get 4.10's or spend your money on something else :2cents. oh yeah & anytime you change gear's IMO you should get a bearing kit & a clutch kit for the t-lock.
 

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well in 3rd like 112 at 6200rpms. But if you let it shift into 4th I have done 130 or so and could have kept going
 

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Get a bearing kit. The ford racing kit is 99 dollars from summit and it includes all the bearings, seals and races for your rear end. Well worth it. Every person over 50k miles or so I recommend changing the bearings and seals.

Are you a DD? I did gears on my friends car that has an 04 gt manual and it made a big diff.
 

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Get a bearing kit. The ford racing kit is 99 dollars from summit and it includes all the bearings, seals and races for your rear end. Well worth it. Every person over 50k miles or so I recommend changing the bearings and seals.

Are you a DD? I did gears on my friends car that has an 04 gt manual and it made a big diff.
yes i am a DD, ithink im going to go with 4.10

INCOME TAX MONEY FTW!!
 

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I would do 4:10s too. 4:30's you will top out at 100mph with a normal street tire and rim. Inless you run 15in rims and a tall DR's or slick all the time I wouldnt' go over 4:10s bro
 

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KnightRider,

I would go 4.30s. 4.10s in an auto is the same thing as 3.27s in a 5 speed. You won't top out your car at 100mph and if your worried about the top end get a 28" tire. But with your power you won't be trapping over 105.
 
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