I need to replace the rear axle in the 64 moredoor valiant, it has a 7 1/4 with 3:23 gears. I have only been able to find 2:76 geared rearends, I don't want to use that gear ratio as I am afraid I will lose some of the umpf from the slant 6 and automatic. We do use the car for camping so it gets...