Im new to the performance aspect of mustangs, ive always loved them but now i got the need for speed seeing as how my roomate has an 03gt vert that runs 13.1 here in colorado springs. My question is my gt is an automatic and everyone tells me i should put 4:10 gears in it rather than 3:73 however i am worried that on the highway my rpms will be up over 3 grand. i know what 4:10 gears feel like cause my roomate has them in his but his car is also a 5 speed so its different ya know? I just got rid of a 94 mustang gt that i put a t5 in out of an 89 svo- big mistake cause on the highway i was up over 4 grand at 70mph, i just dont want a replay of that because i actually plan on keepin this car. Any helpful advice you could pass along would be greatly appreciated, Thanks