After I decoded my rear axle housing, it turned out to be date correct for my car but decoded to an open rear. One thing that supprised me when I took the rear inspection cover off was that indeed was a posi rear. As funny and weird as it may sound, my car has a dealer installed optional towing package. Tow bar, heavy duty electrical system, and posi unit. This was told to us by the previous owner who was the second owner. He got this from the original owner who had that installed because he towed around a small trailer for camping. Again, yours is probably different sinario cause you have your build sheet that says one thing with a case that says another. Like was said before, best bet would be to see the casting or manufacture date and compare it to the rest of your cars dates to see if it would be original. [img]graemlins/thumbsup.gif[/img]
Morris County, NJ
El Camino----The ORIGINAL Sport Utility Vehicle !
-1970 El Camino SS 396 (true SS, highly optioned car) AACA Senior Gold Winner (Hershey 2005) , 2006 Concours d'Elegance Star Award winner
-1969 Dodge Charger HP 383 ci. 4 spd AACA Senior National Winner (Herhey 2007)