3.73's or Diablo Sport Predator for my '03 GT?

 

thats a hard one......go with both.....

you will need to tune ur speedo anyway after the gears....so the predator will help you there.....

 

I got both with my 4.10s. I love them by the way, I just got them put on a couple days ago and they kick ***! Why have you ruled out the possibility of 4.10s? Too much highway driving?

 

4.30's and Speedcal.

 

I would say the Predator first because you are going to need it later to recal your speedometer with the gears.

 

3.73's

i could care less if my speedo works or not, I have been driving fast enough to know how fast im going. And you can always get the tuner later.

 

i've had my 4.10's sitting in my basement for a year now and i just ordered the predator tuner so i could get them installed and i have an appointment the 27th and the tuner should be here sometime this week. you need to recalibrate your speedo when you change out the gears so i would say get the tune and use it for the 15-20 HP its good for as well as other things and then you can use it when you change your gears.

p.s.- is you car an auto or stick?