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rear diff fluid

justinf89

Active Member
Joined
April 21, 2010
Messages
141
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0
City, State
Hampton, VA
Year, Model & Trim Level
'97 xlt 4x4
I'm just about to hit 100k miles and looked up in the manual and found this:

"The rear axle is filled with
synthetic lubricant and will not
require a lubricant change during
the life of the vehicle unless the
rear axle has been submerged in
water. In addition, rear axle
lubricant quantities need not be
checked or changed unless a leak
is suspected or repair is needed."

Is it true that the fluid will NEVER need to be changed? Maybe they don't expect these trucks to last very long? I was just about to change the fluid and it is kind of expensive at $18 a quart. If I don't need to, I guess I don't need to.

I was also under the impression that only the limited slip diff's were filled with synthetic fluid, which I do not have. Mine is a reg diff with 3.50 gears.
 


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my pos mounty

Well-Known Member
Joined
September 15, 2009
Messages
1,812
Reaction score
1
City, State
Land of Corruption
Year, Model & Trim Level
06 F-350
Well, that depends on whos definition of "lifetime" you want to achieve.
I would change it, and use the synthetic. Its an all around better lubricant, period.
$54 is cheap compared to the cost of having to have work done in your rear differential.
 




justinf89

Active Member
Joined
April 21, 2010
Messages
141
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0
City, State
Hampton, VA
Year, Model & Trim Level
'97 xlt 4x4
In the manual, the conventional diff's call for 80w90 and the limited slip ones are 75w-140. I thought they were all the 140 but I just looked. I remember the other day, advance auto only carried conventional and synthetic blend 80w90. I guess the synthetic blend will be fine.
 




alohamonte

Active Member
Joined
October 4, 2007
Messages
786
Reaction score
4
City, State
Glendale, AZ
Year, Model & Trim Level
1998 Explorer 4.0 4x4
I had a quick diff question since I'm doing this job soon (as it stops raining). I'm going to pull the cover too since the seal looks damp in a few spots.

Anyway, I'd like to clean the gears up real nice and was thinking of spraying the inside carrier/gears down with brake cleaner to remove as much as the old grim as possible. Anyone read or see anything saying you shouldnt clean the gears?

Thanks
 




ahodges

Elite Explorer
Joined
August 31, 2009
Messages
1,362
Reaction score
51
City, State
Millbury, OH
Year, Model & Trim Level
1996 XLT - 347 S/C
As far as the wieght and type of oil debate, I was told by the dealer that no matter limited slip or not use 75W-140 full synthetic. Now I know most of you are saying yeah but the dealer likes your money, but I trust this dealer especially since they told me to put conventional 80W-90 in the front... Now I'm going against that advise and going to put 75W-90 Amsoil in the front but I am putting 75W-140 full synthetic Motorcraft in the rear. Everyone has their own opinion though..

and the lifetime question.. I wouldn't.
 




ahodges

Elite Explorer
Joined
August 31, 2009
Messages
1,362
Reaction score
51
City, State
Millbury, OH
Year, Model & Trim Level
1996 XLT - 347 S/C
I had a quick diff question since I'm doing this job soon (as it stops raining). I'm going to pull the cover too since the seal looks damp in a few spots.

Anyway, I'd like to clean the gears up real nice and was thinking of spraying the inside carrier/gears down with brake cleaner to remove as much as the old grim as possible. Anyone read or see anything saying you shouldnt clean the gears?

Thanks

I did this lightly as to remove most of the dark looking crud but be warned, oil it back down right away cause rust starts to form quickly... I'm not sure if its recomended or not..
 




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