Only you can decide what is right for you, I put in 27" tire and 60 mph for the following calculations.2.74 - 2100 rpm3.23 - 24753.55 - 2700 3.91 - 3000 4.11 - 3150 4.30 - 33004.56 - 3500
I think that's off a little. I can tell you from first hand experience with my 65 Valiant. It had 28/11.50/15 E/T Streets with 4.30 gears and a loose 3000 converter. I drove that car literally everyday back and forth to work on the interstate about 6 miles one way. Kept my big toe on the gas at 55 MPH and it was a tad over 2500. Spent most of its time in converter slippage, but the car was very light, had lots of gear and a BIG trans cooler.
