Synthetic Gear Oil with Limited Slip? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-12-2010
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Synthetic Gear Oil with Limited Slip?

Hey guys, I am putting a limited slip diff in my Ranger. Can I used a synthetic 80W-90 gear oil with my limited slip? I have a 4oz bottle of the motorcraft friction modifer to use already. I have heard the the synthetic gear oil (like Royal Purple, Valvoline SynPower, Mobil 1 ect.) have friction modifier in them already so I dont want to have too much friction modifier in there and make my l/s too loose. Also, is 3-4 quarts enough for the 8.8? Thanks.
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Old 10-12-2010
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I'd use 75-140W Royal Purple (etc) or use conventional with modifier. I dont think your gonna use more then 2 bottles of gear oil.
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Old 10-13-2010
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Mobil1 already has it. No extra needed.
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