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Discussion Starter · #1 ·
I had a 12 bolt rearend narrowed for my 56 project.

How many quarts of gear oil do I need to fill it up?

I am going to use Royal Purple and don't wish to buy more than needed.
 

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the gm service manual says 2-1/4 quarts + 1/2 pint of posi addative. I always use the addative or the posi will chatter when you turn corners:eek:
 
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