3:55 gears on the street

purpledart said
Just went for a cruise and the dart is right where you wanna be 2600= 60mph
4500=90mph

This is a 340-727 car. I don't know how much different a 360 would be?

Your speedo is off. Did you change the gear in the trans to match your tire size/gear ratio?

With a 255/70/15 and a 3.23 you are around 78-69 MPH at 2600 rpm and 120 at 4500 rpm.

http://www.kabamus.com/garage/gears.html