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Ford specifications on front and rear lube #4672070
02/20/18 03:35 PM
02/20/18 03:35 PM
Joined: Oct 2017
Posts: 506
Northeastern Vermont
littleant Offline OP
littleant  Offline OP
Joined: Oct 2017
Posts: 506
Northeastern 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
Re: Ford specifications on front and rear lube [Re: littleant] #4672082
02/20/18 03:44 PM
02/20/18 03:44 PM
Joined: Sep 2014
Posts: 2,179
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,179
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.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 103K Napa 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
14 RX450h 35k PP MIX, NG7047
Re: Ford specifications on front and rear lube [Re: littleant] #4672085
02/20/18 03:48 PM
02/20/18 03:48 PM
Joined: Jun 2002
Posts: 19,520
Iowegia - USA
MolaKule Offline
MolaKule  Offline
Joined: Jun 2002
Posts: 19,520
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

Last edited by MolaKule; 02/20/18 03:52 PM.

Scars remind us of where we have been, but do not have to dictate where we are going.
Re: Ford specifications on front and rear lube [Re: MolaKule] #4672089
02/20/18 03:51 PM
02/20/18 03:51 PM
Joined: Sep 2010
Posts: 7,594
Planet Earth
2015_PSD Offline
2015_PSD  Offline
Joined: Sep 2010
Posts: 7,594
Planet Earth
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

Re: Ford specifications on front and rear lube [Re: littleant] #4672252
02/20/18 05:56 PM
02/20/18 05:56 PM
Joined: Nov 2011
Posts: 164
New Jersey
Ursatdx Offline
Ursatdx  Offline
Joined: Nov 2011
Posts: 164
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.

Re: Ford specifications on front and rear lube [Re: littleant] #4672434
02/20/18 08:26 PM
02/20/18 08:26 PM
Joined: Sep 2013
Posts: 10,683
Indiana
dlundblad Offline
dlundblad  Offline
Joined: Sep 2013
Posts: 10,683
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.


03 Jeep WJ 4.0 202k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 186k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 153k Synpower 5w30 Supertech ST3980 (Ecore)

Re: Ford specifications on front and rear lube [Re: littleant] #4672444
02/20/18 08:35 PM
02/20/18 08:35 PM
Joined: Oct 2017
Posts: 506
Northeastern Vermont
littleant Offline OP
littleant  Offline OP
Joined: Oct 2017
Posts: 506
Northeastern 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
Re: Ford specifications on front and rear lube [Re: littleant] #4672484
02/20/18 09:04 PM
02/20/18 09:04 PM
Joined: Sep 2015
Posts: 2,477
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,477
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.

Re: Ford specifications on front and rear lube [Re: littleant] #4672486
02/20/18 09:07 PM
02/20/18 09:07 PM
Joined: May 2012
Posts: 1,839
The land of USA-made Subies!
SubieRubyRoo Offline
SubieRubyRoo  Offline
Joined: May 2012
Posts: 1,839
The land of USA-made Subies!
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!

Re: Ford specifications on front and rear lube [Re: littleant] #4672714
02/21/18 06:39 AM
02/21/18 06:39 AM
Joined: Oct 2017
Posts: 506
Northeastern Vermont
littleant Offline OP
littleant  Offline OP
Joined: Oct 2017
Posts: 506
Northeastern 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
Re: Ford specifications on front and rear lube [Re: littleant] #4676342
02/24/18 10:28 AM
02/24/18 10:28 AM
Joined: Oct 2014
Posts: 753
Pa, USA
NH73 Offline
NH73  Offline
Joined: Oct 2014
Posts: 753
Pa, USA
Also be aware there is nothing like a 75w90 conventional. Don't lose sleep and use synthetic.


2017 Toyota RAV4 Hybrid
2004 Ford Explorer Sport Trac
2012 Gravely ZT XL 48 w/ Kawasaki FR730
Re: Ford specifications on front and rear lube [Re: MolaKule] #4678680
02/26/18 12:13 PM
02/26/18 12:13 PM
Joined: Jul 2008
Posts: 445
London, UK
Izb Offline
Izb  Offline
Joined: Jul 2008
Posts: 445
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?

Last edited by Izb; 02/26/18 12:14 PM.

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