Welcome Kris
Can you fill out your personal profile so we know who you are?
Your rearend code will be stamped into the passenger side rear axle tube,facing either upwards,or frontwards.
It will be stamped lightly,so becareful as to not remove it with an electric sander,etc.
You should also post this is the Technical area,staring your own thread..But thats OK,you'll get used to it,and you are on the right website anyway.
Rick