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#4672070 - 02/20/18 03:35 PM Ford specifications on front and rear lube
littleant Offline


Registered: 10/10/17
Posts: 388
Loc: Vermont
Hi folks. On my 2010 mountaineer 4.0 AWD ford spec the rear diff 75w140 Synthetic and for the front 75w90 conventional. Gear ratio is 3.55 open front and rear. What is your opinion on why ford would spec two different weight lubes. Thank you.
_________________________
I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0

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#4672082 - 02/20/18 03:44 PM Re: Ford specifications on front and rear lube [Re: littleant]
Dyusik Online   content


Registered: 09/26/14
Posts: 1984
Loc: US-WA
My only guess would be a class 3/4 tow package. No other reasons come to mind why a heavy lube like that would be needed in a grocery hauler.
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#4672085 - 02/20/18 03:48 PM Re: Ford specifications on front and rear lube [Re: littleant]
MolaKule Offline


Registered: 06/05/02
Posts: 19042
Loc: Iowegia - USA
Replacement fluids could be:

Rear Amsoil SVG 75W140

https://www.amsoil.com/lit/databulletins/g2043.pdf


Front Amsoil LL 75W90

https://www.amsoil.com/lit/databulletins/g2042.pdf


Edited by MolaKule (02/20/18 03:52 PM)

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#4672089 - 02/20/18 03:51 PM Re: Ford specifications on front and rear lube [Re: MolaKule]
2015_PSD Offline


Registered: 09/26/10
Posts: 7245
Loc: SE Texas
Originally Posted By: MolaKule
Replacement fluids could be:

Rear Amsoil SVG 75W140

https://www.amsoil.com/lit/databulletins/g2043.pdf


Front Amsoil SVG 75W90

https://www.amsoil.com/lit/databulletins/g2042.pdf
Yes; and if I may suggest 75W-110 for the front axle smile
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#4672252 - 02/20/18 05:56 PM Re: Ford specifications on front and rear lube [Re: littleant]
Ursatdx Offline


Registered: 11/01/11
Posts: 132
Loc: New Jersey
Sport Trac rear differential?
Take a peek at the rear axle. The Sport Trac (Limited Slip?)
will have a tag on it stating Syn 75w140.
Some have a 1/2" drive fill/drain plug vs 3/8" and no drain.
If it's a Sport Trac diff, change the fluid.
I'd bet it's black in color.

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#4672434 - 02/20/18 08:26 PM Re: Ford specifications on front and rear lube [Re: littleant]
dlundblad Offline


Registered: 09/30/13
Posts: 10058
Loc: Indiana
Originally Posted By: littleant
Hi folks. On my 2010 mountaineer 4.0 AWD ford spec the rear diff 75w140 Synthetic and for the front 75w90 conventional. Gear ratio is 3.55 open front and rear. What is your opinion on why ford would spec two different weight lubes. Thank you.


Are you certain other models require the same fluid for front and rear? Maybe this is normal.
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#4672444 - 02/20/18 08:35 PM Re: Ford specifications on front and rear lube [Re: littleant]
littleant Offline


Registered: 10/10/17
Posts: 388
Loc: Vermont
I believe ford has this split spec for the front and rear diff on most SUV AWD. Dyusik yes it does have tow package with the small receiver hitch (1 1/4 or 1 1/2
_________________________
I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0

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#4672484 - 02/20/18 09:04 PM Re: Ford specifications on front and rear lube [Re: littleant]
zeng Offline


Registered: 09/01/15
Posts: 2189
Loc: Malaysia
Originally Posted By: littleant
Hi folks. On my 2010 mountaineer 4.0 AWD ford spec the rear diff 75w140 Synthetic and for the front 75w90 conventional. Gear ratio is 3.55 open front and rear. What is your opinion on why ford would spec two different weight lubes. Thank you.

Rear axle typically carries higher load than front axle.
Ford engineer specifies 75W140 for rear axle stronger wear protection ....... and had his way ...
over fellow finance guy albeit at the 'expense' of CAFE credit, where applicable.

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#4672486 - 02/20/18 09:07 PM Re: Ford specifications on front and rear lube [Re: littleant]
SubieRubyRoo Offline


Registered: 05/14/12
Posts: 1141
Loc: Winchester, Indiana
Itís such a small quantity and you donít change very often, so just get what they recommend. Itís been too many years since I worked with Ford AWDs, but there may be a couple reasons for the lighter weight. If the system is on-demand or significantly rear-biased, the front axle will not produce as much heat. If it is demand-based, likely the only time it will truly be working all the time is in the snow, and the temps are cold enough the lower weight wonít impede fluid life. The rear axle may be doing the brunt of the work all the time, including high temp summers. Thatís my take. Itís much easier when your AWD is 50/50 all the time, rain sleet or snow. Both my AWD transaxle and rear axle take 75w90. Easy peasy!

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#4672714 - 02/21/18 06:39 AM Re: Ford specifications on front and rear lube [Re: littleant]
littleant Offline


Registered: 10/10/17
Posts: 388
Loc: Vermont
Oh I plan on following the Ford spec. I believe the AWD drive on this vehicle is a 70-30 split but can reach 50-50. Thanks everyone good points.
_________________________
I can't prevent getting old but I REFUSE to grow up.
2010 Mountaineer 4.0
2002 Jeep Wrangler TJ 4.0

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#4676342 - 02/24/18 10:28 AM Re: Ford specifications on front and rear lube [Re: littleant]
NH73 Offline


Registered: 10/31/14
Posts: 699
Loc: Pa, USA
Also be aware there is nothing like a 75w90 conventional. Don't lose sleep and use synthetic.
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#4678680 - 02/26/18 12:13 PM Re: Ford specifications on front and rear lube [Re: MolaKule]
Izb Offline


Registered: 07/02/08
Posts: 444
Loc: London, UK
Originally Posted By: MolaKule
Replacement fluids could be:

Rear Amsoil SVG 75W140

https://www.amsoil.com/lit/databulletins/g2043.pdf


Front Amsoil LL 75W90

https://www.amsoil.com/lit/databulletins/g2042.pdf


Why Amsoil LL 75W90 (not Amsoil Severe gear 75W90) in front axle?


Edited by Izb (02/26/18 12:14 PM)

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