Finally found a number in this are on top of the hog head, it's a number 4, some number is after it, I am assuming the 4 is the first number as when I was looking from the back of the car, with a mirror, the point on the 4 is to the line in the center of this machined area, wish I didn't have a 4.10 or 4.30 in this car, not sure how it ever got in the car. Is there a sure fire method to check the diff ratio, by turning the back tire and counting the driveshaft revolutions. I do have another chrysler here that should have the 354 diff, will just switch the hog heads, if possible............Thanx Fred