What rear end do I have?

[sameyrasmea72]

On the rear end itself there is a date code and usually 3 letters like RHL stamped on the "tube" of the rear end. On a 72 the stamp is about where the arrow indicates in the pic, but on different years in may be in a different location. If you can tell me the year of you truck and what these 3 letters are I can look it up for you.