does anyone know what these diff housing numbers are:
GM 19 3894859
It is a 10 bolt, does anyone know what year it is, Thanks.

That just says it is a 10 bolt housing. The # you want is stamped on the upper front side of the passenger axle tube and will tell us the original ratio and build date. See the 'Decoding' section of www.camaros.org (http://www.camaros.org) for a great sketch of the location.

Let us know what you find.

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Kurt S.
www.camaros.org (http://www.camaros.org)