I have a 1978 F-250 Custom,and I need to replace the rear, Full Floating Axle. In order to find another one to fit, I need to find the gear ratio. I looked on the tag on the differential, but I don't know what the numbers mean! Can anyone help me?
This is what the tag says: 3 54(1?) EDD7I(1?)A AEB
Some of the numbers I wasn't sure of,as you can see above, because there were some rust spots. I wasn't sure if the first number four was a one, or If the "I" in the third section of numbers was a one.