I just got a 69 GTX it's 440 4 barrel with a 727 auto trans. The car has 3.23:1 rear end gear ratio. I bought it knowing it had a rear end noise. The repairs require basically redoing most the rear end. My question is should I keep it the stock 3.23 or increase it? The shop where the rear end is being done suggested leaving it be. He said there is not enough noticeable difference from the 3.23 to a 3.55 for the money and going to a 3.73 or bigger would make the car unbearable on the highway. I don't plan on doing a ton of highway driving and do not necessarily want a car with no guts when I mash the pedal. At the same time, I don't want my muscle car to be restricted to Highway speeds of 55-60 mph.