rear diff oil

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Jan 20, 2010 | 12:34 PM

Rich Gautiero

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Joined: Aug 2006

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From: Florida

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?

Jan 20, 2010 | 02:20 PM

StrangeRanger

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From: Copley, Ohio

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.

Jan 20, 2010 | 06:57 PM

glc

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From: Joplin MO

Wrong weight. The Amsoil application chart specifies 75W90, 80W90, or 75W110. 75W140 is for 1997+.

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