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I bought a HD aluminum rear cover, and since it's off, I'm re-installing with Lucas oil. Is there any reason to put GM additive in with an Eaton Posi? I know on the stock Fbody differential, you need to but is there any reason to with an Eaton or can I just use some off the shelf stuff?
 

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You can pick up posi additive from Napa or any other parts store and it will work just fine. Bob
 
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