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May 12, 2011 | 02:31 PM

oldedge

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differential fluid

Had the diff checked today.fluid was grey in color,looked like it might have a little water in it. 2010 limited slip. wasn't over full. 10000 miles.Any thoughts?

May 12, 2011 | 03:23 PM

shotgunz

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Has the rear diff been submerged?

May 12, 2011 | 04:03 PM

oldedge

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Quote:

Originally Posted by shotgunz

Has the rear diff been submerged?

Not that I know of but I bought the truck used with 4500 miles on it so it is possible.

May 12, 2011 | 05:46 PM

kotzy

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Make sure the rear has a check valve in the vent or vent line. This will stop moisture laden air from entering the housing as it cools down. kotzy

May 12, 2011 | 06:07 PM

tseekins

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How was it checked with out removing the diff cover? Did you extract some with a turkey baster through the fill hole?

May 12, 2011 | 08:12 PM

oldedge

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Quote:

Originally Posted by tseekins

How was it checked with out removing the diff cover? Did you extract some with a turkey baster through the fill hole?

Yes it was extracted through the fill hole. It didn't look too bad but def had a grey color to it. I will have to check to see if there is a check valve on the vent.

May 12, 2011 | 08:29 PM

tseekins

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From: Maine, Virginia

The diffs are filled with synthetic gear oil and the rear diff has a 150K mile change interval, at least that's the case with my '04 Expy. If I were towing I'd likely reduce the interval to 100K miles.

I think I'd talk to the dealer about this one as it's still under warranty.

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May 13, 2011 | 07:44 AM

oldedge

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Quote:

Originally Posted by Joe Finn

I'm straining my memory banks a little bit, but I don't think the fluid being gray is unusual.

wasn't sure but the last that I looked at was more of a honey color after it had been in for about 20000 miles

May 14, 2011 | 11:24 AM

#10

vloney

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Its normal. Thats how it looks.

May 14, 2011 | 01:27 PM

#11

oldedge

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Quote:

Originally Posted by vloney

Its normal. Thats how it looks.

Thanks for the info. I wasn't sure what it is supposed to look like.

May 15, 2011 | 03:55 PM

#12

WV-150

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From: South Carolina

Its looked that way since the 97s came out.Synthetic gear oil.

May 16, 2011 | 09:42 AM

#13

FireMe

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From: Northfield, MI

The gray color comes from the white marking compound used when the axle is set up at the factory. There is a special service message from Ford about this topic.