All of this reminded me of a website I used like a decoder ring for figuring out my differential gear ratio in preparation for doing a factory e-locker swap. I thought it would be nice to sort of close the loop on this drivetrain model number love-fest by including a link to the website that has all of the codes explained:
off-road.com
You can find your code on the VIN plate on the door sill (e.g., A03A) and go to town.