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Old 03-08-2010, 10:53 PM   #1
dgodecke
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Join Date: Feb 2010
Location: Poulsbo, wa
Posts: 42
Question Help with a RPO number

I am looking at the service parts identification sticker found on the left inner fender on my 73 GMC.

It has a code 1ZN8 for an optional axle ratio. I can't find that code any place and I have searched the net up and down. Can anyone help me with this code?

Thanks all.
__________________
07 Chev 2500HD Classic
Project Ranch Hand, Hauling A$$ since 1973
I was told this Project had a L-72 427 425HP, It did not.
It does have a 427 block and parts from various 427 motors. It will end up with a nice strong 454 in the end.
It has not been run for 20+ years
Frame up restoration started2/15/2010
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