Ok, after having enough time to sit and look more your MODEL #22121 setup should have a 5.57 ratio. I don't know what the G number is about maybe something for production? Any ways to verify the ratio take the 3rd member out and look at your gears, there will be numbers on the drive pinion and the ring gear. Here is another for anyone's curiousity.
http://www2.dana.com/pdf/AXSM-0043.pdf