Quick Question Regarding Front Dif Oil

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Mar 17, 2014 | 04:29 PM

ace555

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Junior User

Joined: Oct 2004

Posts: 85

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From: Nashville

Quick Question Regarding Front Dif Oil

I bought RP 75W140 and without thinking changed both the front and rear diffs, both with that weight oil. Of course I get online and find that the front only needs 75W-90. Did I just throw away $100 or can I leave that weight in front and be ok?

Thanks guys

5.4L 4x4

Mar 17, 2014 | 06:29 PM

Brown Falcon

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Joined: Jul 2008

Posts: 11,231

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From: Thomasville, GA

You can leave it in there. Lots of people run the heavier weight oil, especially when towing/hauling.

Won't hurt anything.

Mar 20, 2014 | 01:14 PM

1saxman

Fleet Mechanic

Joined: Jan 2007

Posts: 1,293

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The axles will probably run quieter in the summer, and you get some hot weather there. Also, if the truck has over 75,000 miles, its probably a good thing. Plus now, you can tow in reverse without harming the front axle!

Mar 22, 2014 | 06:54 AM

60DRB

Laughing Gas

Joined: Dec 2009

Posts: 799

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From: East L.A.

..."Plus now, you can tow in reverse without harming the front axle!"

That's funny.

You didn't hurt anything. I put the heavier oil in my front differential too. On purpose.