I'm planning on changing my '03 GT, with auto. trans., 3.27 gear to either a 3.73 or 4.10. I've gotten some formulas to figure RPM's at 60 MPH and 70 MPH. With the 3.73 at 60MPH it looks about 2000 RPM's and at 70 it looks around 2350RPM's. With the 4.10 60 MPH is at 2200 RPM's and 70 MPH is at 2600 RPM's. Those numbers look about right? If they are I'd like to hear from anyone running either gear on which they like better. Most of my driving will be in town at 60 MPH or less. My car needs some help from a stop. Thanks Mike

 

4.10's all the way, no doubt about it. ESPECIALLY for an auto.

 

Yep no doubt!!!

At 80 I'm at 2.7 with a 5 speed and 4:10's.

 

i have 4.10's and love them i also do a little hiway driving your formula's are right on. if i only did around town less than 60 mph i would get 4.30's.