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I have 3.90's and im in 4th gear in my manual at like 120-125... 4.10's aren't goin to be much lower then that... but then again it's a 4spd auto... Go with 4.10's - everyone that I have ever talked to say that if you have an auto, you need the 4.10's... but, gears + tune will give you the most noticable differance then really any bolt on imo.