“Best” all around axle ratio: ~450hp w/ A904?

roccodart440 said

That's the calculator I used, I assumed a 28" tire, which yields 2,350@50mph with your gears.

2,550 @50mph with your 3.91's and 26" tires.

Click to expand...

Yup! Again to your point, the speedo and tach have been recalibrated and I have the correct speedo gear installed for the 3:55's so I'm hoping for a significant RPM drop on the highway. Im looking forward to testing the theory!!