Longknife
Well-Known Member
Hello. I have 69 rr with a mildly built 383 4 speed. It has a 3.23 open rear end. I am wanting to put in a sure grip with a lower ratio. I am running a 28 inch tall tire. I punched in the numbers to a gear ratio calculator and it said I need 3.46 gears so a 3.55 would be about perfect! Now I am thinking maybe going a little lower maybe 3.73 or 3.91, This car is mostly for cruising, maybe a couple of 100 mile runs a season (oh and a random burn out here and there)!! Any opinions? Thanks, Ed