12 Bolt...
That is the casting number for the 12 bolt center section....68-69 Nova and Camaro
The posi designation is in the stamp on the tube...there will be an E below the gear ratio and date. the E stands for Eaton Posi...of course, you should always look inside to confirm what is in there.
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02 Berger 380hp #95
Lots of L78 Novas
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70 Orange Cooler
69 Camaro
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