well i have a 99 stang that is auto and my g/f is buying me gears for xmas.... how bad is the gas on each but also is there a big change in the gas of each? like does one burn more alot quicker?

 

1 mpg highway wiht 3.73s, 2 with 4.10s, city stays the same

NA/Nitrous/centri = 4.10
turbo/twin screw/roots = 3.73

you should also invest in an LSD unti

drivetrainspecialists.com has detroit true tracs which are pretty much bullit proof, stangmods.com has tloks available which are good on stock/mild bolt on cars if you dont drive them hard

 

Unless you plan on racing a lot I would go with the 3.73's.

 

ok well then im gonna opp for the 3.73s but do u know newhere that is somewhat cheap?

 

Like raz54 said Unless you plan on racing a lot I would go with the 3.73's I agree with that I have 3.73s they are a nice little upgrade for somebody who wants to make there car faster but not over do it. But if you wanna go kindof far with your car than it could be better to go with the 4.10s

 

pick em up on ebay for $50. Get a posi unit too, NOT A USED T-Lock

 

get the 3.73's.... and def get an LSD. it will save money and time for install if you choose to do them both at the same time

 

Used gears are fine as long as you get them from a good source that warranties their stuff. I also agree with the above about putting in a t-lock at the same time and save a bunch of money.

 

Normal driving with 4.10s will get you about 18 mpg but yeah go with 3 73s if you want a kick but not gona race it that much and still keep gas mileage in mind.

 

If its an auto you should probably do 4.10s ....