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Rear Diff
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Posting Guru
Joined: Dec 2001
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From: Medford USA!
Rear Diff
Had the oil changed last week and the service guy showed me that my rear differential fluid was "milky" and full of bubbles. Even though the truck has only 16+k miles on it he said that it should go 50k without a change to the dif oil, and I might have something going on thats breaking down the oil (it has the LS option). What do you guys think?
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
Rear Diff
Outpost,
My thoughts are water or condensation within the dif.
Did you go through any flooded areas or roads in the past?
Did you have trouble with the ls when the truck was newer?
Did some one mix synthetic with standard gear lube?
Me I'd change it ,be safe than sorry!
Just My $.02
Rich
Ford Trucks Built Tough!
not with rocks
Watch out "X" Mayor of Truckville
My thoughts are water or condensation within the dif.
Did you go through any flooded areas or roads in the past?
Did you have trouble with the ls when the truck was newer?
Did some one mix synthetic with standard gear lube?
Me I'd change it ,be safe than sorry!
Just My $.02
Rich
Ford Trucks Built Tough!
not with rocks
Watch out "X" Mayor of Truckville
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Rear Diff
>...the service guy showed me that my rear differential fluid was "milky" and full of bubbles.
The only time that I've seen "milky" oil is when it has been contaminated with water.
>...he said that it should go 50k without a change to the dif oil,
You should never have to change your rear diff. fluid unless it is submerged in water. (so says the manual) Or, as it looks in your case, contaminated with water.
The only time that I've seen "milky" oil is when it has been contaminated with water.
>...he said that it should go 50k without a change to the dif oil,
You should never have to change your rear diff. fluid unless it is submerged in water. (so says the manual) Or, as it looks in your case, contaminated with water.
Posting Guru
Joined: Mar 2002
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Rear Diff
Water maybe?
Condensation,clogged vent,four wheeling deeper than the vent,many short trips with very little hwy.use to warm up and evaporate moisture.
I'm not saying it is,but I'm throwing these possibilities out there in case it is water.
Condensation,clogged vent,four wheeling deeper than the vent,many short trips with very little hwy.use to warm up and evaporate moisture.
I'm not saying it is,but I'm throwing these possibilities out there in case it is water.
Senior User
Joined: Feb 2002
Posts: 402
Likes: 0
From: Two Harbors, MN
Rear Diff
I'd be really careful with this problem outpost... In my "young and dumb" years, I had an 81 F250, that I "used"..I went through water, mud, snow, everything imaginable and one day, 150 miles from home, the axle sheered off... Long story short.... when they took it apart, the gear lube was milky white.... $1500 later (this was in 82)I was back on the road...
Change the lube....
Change the lube....
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Posting Guru
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From: Medford USA!
Rear Diff
The only "water" I can think of going through is once I launched my B-I-L boat in Lake Mead and had to back in up to my rear axle to get it launched. That might explain it....
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Postmaster
Joined: Nov 2001
Posts: 4,742
Likes: 8
From: OK
Rear Diff
The lake would do it- especially if the axle was hot when you submerged it. Change the lube as soon as possible.
BTW, that's a pretty good oil-changing place! Not many will actually check the fluids they are supposed to check.
BTW, that's a pretty good oil-changing place! Not many will actually check the fluids they are supposed to check.
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Posting Guru
Joined: Mar 2002
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Rear Diff
When they added new lube did they also add friction modifier?
I once had a rear axle cover weep repaired under warranty at the dealer and before I got home I knew they forgot to add a few ounces of the stuff.The clutches aren't smooth around corners without it.
I once had a rear axle cover weep repaired under warranty at the dealer and before I got home I knew they forgot to add a few ounces of the stuff.The clutches aren't smooth around corners without it.
Posting Guru
Joined: Dec 2001
Posts: 1,110
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From: Iberia, USA
Rear Diff
we had a 94' one ton dually that the top of the cover rusted out on it. the reason was that we didnt drive it that much(sold in 2000 w/ 65,000 miles on it)and condensation built up in it. so, when the pan gets removed look at the top of the cover to see if it is all rusty and you will find out if this is or isnt the cause.
-nathan
-nathan
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Posting Guru
Joined: Dec 2001
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From: Medford USA!
Rear Diff
>When they added new lube did they also add friction
>modifier?
Yes they did. I called them first to see if they had it, and they purchase it directly from Ford. Thanks to these forums, I was ahead of the curve on this one
>modifier?
Yes they did. I called them first to see if they had it, and they purchase it directly from Ford. Thanks to these forums, I was ahead of the curve on this one
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