Where can I find a list ofcode for '70 Olds

I got some more Free stiff yesterday. Among the stuff is a thrid member from a 1970 Olds Cutlass. It is labeled as a 2.73:1 open. But I'd like to check the axle code to verify what I have. Thanks

 

Jump over to realoldspower.com, good bunch of guys over there too. They should have what you need.

 

Thanks for the referral. I am always getting to the quick when I ask a question on the board. Thanks!

 

Third member??? The posi unit / open carrier? Or is it an older 1953-1964 drop out olds / Pontiac third member bolt in pig? Jim