I was reading past threads and see that most people say 4.10's are the way to go. I have the opportunity to pick some up for 75 bucks. I am a poor college kid and was wondering about how much worse that will make my gas mileage and how much of a differencethey would make on the road/street compared to my 3.55's.

 

If you drive nice your mpg wont go down to much. 75 is a good price for gears. the install is the pricey part.

 

with 4:10s u wont see a decrease in mpg unless you do alot of hwy driving. 75 bucks isnt always a great deal on anything used tho, if they are For Racing gears in good shape id jump on them. If they are motive or some off brand i wouldnt bother with them. I like the 355s in the mach personally and in my opinion, you wont see a dramatic increase. Be prepared to buy an installation kit and unless you have a good hookup, its really is pricey to get them installed and done right.

 

The gears are ford racing gears and are brand new. A friend of mine with his 10 second5.0 put them in his car but didnt like them so took them off and got a different size. I also have a mechanic friend that would put them in for next to nothing but if spending what money i will for the stuff isnt worth the performance ill have to invest the money in something else that would be more worthwhile.

Why would gears need an installation kit?

 

there is a lot more in a kit than just the gear set, it comes with everything