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**DANTIP** · 07-14-2011, 12:26 PM

You are both correct, the GM parts manual says that is a 1072 3.07 (open) for CS/CE, and the same stamp was used in 1970 for a 3.73 (open). Therefore, if it is a 6-lug, it's probably the 3.73 and if it is a 5-lug it's probably a 3.07.

Good Luck!!

07-14-2011, 12:26 PM	#8
DANTIP Registered User Join Date: Sep 2001 Location: Fort Wayne, Indiana, USA Posts: 1,880	Re: Help with rear axle code You are both correct, the GM parts manual says that is a 1072 3.07 (open) for CS/CE, and the same stamp was used in 1970 for a 3.73 (open). Therefore, if it is a 6-lug, it's probably the 3.73 and if it is a 5-lug it's probably a 3.07. Good Luck!!