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you could get 3.55, 3.73, 4.10....i went with 3.73....remember the higher the gear the more of a punch on the acceleration...but gears aren't to good for higway driving...you'll be higer up there in RPM's but not bad...i'm not sure where the best place is to buy from...try Jegs.com, summitracing.com, mustangtuning.com...etc...so many more places to look...just type mustang parts in search..haha
I also agree that gear, exhaust, and CAI are the first 3 things you should do. For gear I recommend 4.10 (because you have an auto), for exhaust I recommend magnapacks, and any brand CAI
glad that got brought up....my 98gt is also an auto... why go with 4.10's, and not 3.73's? just curious becuase i am buying gears within the week here lol. thx.