I have a Richmond T-10 in my 66 Impala.Weighs right at 4200.Got a 2.73 gear in it.My first gear ratio is right at 2.89 I believe.The deepest I could find.Motor makes 385 horsepower and a little mote torque.Car is real peppy to be geared so high and heavy.I love it.Been abusing (seriuosly)that tranny since I bought it new 43,000 miles ago.Not one hiccup.Knock on wood.