I'm the luckiest guy ever!

so, about 2 months ago when i bought my stang, the dealer gave me a 2 year 24000 mile warranty with it, so i brought it to my shop becuse it was making noise in the rear end, the shop called it in to the warranty company, and after the shop answered a few questions, the warranty company sent the shop 900 dollars to fix the car.. I asked about the gear ratio and they said it doesnt matter what they put in it as long as it costs less than 900 dollars lol. i had them order FRPP 4.10 gears, so now im basically getting 4.10 gears and getting the rear end rebuilt for FREE! how awesome is that?

haha, seriously!


so i'm debating.. i did a search on 4.10 gears on google, and a lot of people say that ill get a drop in mileage and ill lose a lot of top end.. is that true? i know the mileage will go down, but it wont go down THAT much will it? basically what are the pros vs drawbacks with 4.10's?