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Differential oil, do I need posi additive?

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Old 06-04-2004, 09:37 PM   #1
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Differential oil, do I need posi additive?

Here is a pic of my differential. It is posi or limited slip or whatever, early 3rd gen 7.5 type 3.73 rear end. I got Lucas high performance 80/90 plus gear oil. The oil says its excellent for use in limited slip differentials and no special additive is needed. I bought a tube of K&W posi rear additive thinking I needed it. Do I need to put this in? I dont want to mess anything up by putting or not putting the additive in.
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Last edited by 83ho86tpi; 06-04-2004 at 09:40 PM.
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Old 06-04-2004, 09:51 PM   #2
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If it already has friction modifiers in it than you shouldnt need to use the additive. I bought some redline performance gear oil and it already comes with it so I dont need to add anything.
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Old 06-05-2004, 11:54 AM   #3
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No additive needed, thats a grenade lock anyway, additives dont do much good. I had one in my 85, it lasted maybe a month.
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1995, 1999, 8090, additive, am, camaro, changing, differential, friction, gear, lucas, modifier, oil, posi, trans

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