Rear End I.D. Help!!=??

Hello all u Guru's- great help as usual- what im needing is a chart / place to go =internet= That has all the GM ID codes posted for axle housings . This is the numberning system codes stamped on the passenger housing side. Not The ratio stuff inside . On the outer right (pass) side of the housing area. Anyone?? This will tell what vehicle the housing origionally came in-Thanx,matt