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Old 04-25-2004, 02:38 PM
ModelAdave ModelAdave is offline
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Question 9 inch ford gear oil

Guys - I'm just about to add 75W90 Synthetic oil to my 9" posi rear end. Am I about to make a big $$$$ mistake??? I'm getting conflicting opinions on synthetic v. regular fluid. And what's the deal with the friction modifier??? I've never heard of that. Do I need it if I run synthetic.

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