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rear diff oil

   
Old Jan 20, 2010 | 12:34 PM
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Rich Gautiero's Avatar
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From: Florida
Unhappy rear diff oil
Replaced rear diff oil with Amsoil 75-140+ford friction modifier and now the rear is whining,94 F150 A40D 5.8 3.55 LS. Any Help?
 
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Old Jan 20, 2010 | 02:20 PM
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StrangeRanger's Avatar
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80W90 is the recommended lube. I cannot see why the 75W140 would cause a problem though unless it's too thick to get into some of the roller bearings. It should not cause gear noise.
 
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Old Jan 20, 2010 | 06:57 PM
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glc
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Wrong weight. The Amsoil application chart specifies 75W90, 80W90, or 75W110. 75W140 is for 1997+.
 
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