Parts Identifier Label

[kilmersautosales]

Does anyone know the what series of numbers of the parts identifier label is for the gears in the rear end? I have a 99 Camaro SS and I would like to know if I have a 3:23 or the 3:42. Thanks

[Ed Blown Vert]

M6's only came with 3.42's

[2001NBMZ28]

Gu5 - 3.23 A4
Gu6 - 3.42 M6

[JROBINSON1016]

go to "fbodymotorsports.com",they have a list of all the rpo codes.