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3.90 gears?

4470 Views 15 Replies 9 Participants Last post by  MooStang05gt, 
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I have seen a 3.90 gear ratio on mustangtuning.com is anybody out there using this ratio? if so feedback please... im thinking of installing these or 4.10s on my manual 06 gt. i drive an average of 25-30 miles a day. 50% highway 50% city.
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5twenty
I notice Ford Racing doesn't even sell 3.90 gears. Why is this? Everyone always debates between 3.73 and 4.10. Is there some reason I should not put 3.90s on a 5 speed manual? They sound like a great compromise between 3.73 ad 4.10. I wan the quicker ETs but this is my daily driver as well and I put on a lot of highway miles. Anyone know of a reason not to use 3.90s?
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