Hi guys, I have a couple of questions for those of you with the 3.9 Final Drive. On average how much time, if any, did it shave off your 1/4? How much did it increase your rpm's at highway speed? I spend about an hour a day on the highway so I'm wondering what kind of affect it would have on gas mileage. Thanks!

 

No opinions on this one?

 

Search button will help you out. This question is up there with "which intake is best" etc.