Jim,
 
Look on the axle housing on the passenger side of the car... could be on the top... or bottom... most likely on the bottom... you will find a code... 2 letters... 4 digits.. 1 letter. 
You can then decode the code at www.chevelles.com ... rear codes... will tell you what it is... unless someone has changed it without you knowing it.
 
Donnie

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