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#4755302 - 05/12/18 07:37 PM 17 Mustang GT
Anthony Offline


Registered: 09/23/04
Posts: 593
Loc: GA
Differential has 75w85 in it. Cars prior to 2015 had 75w140 in the solid axles. New cars are IRS. I doubt the thin gear oil was for nothing more than helping meet CAFE requirements. I'm about ready to change the oil to 75w110 Amsoil Severe Gear.

Does anyone here have good experience putting Severe Gear in a Ford LSD without using the Ford LSD additive?
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#4755308 - 05/12/18 07:40 PM Re: 17 Mustang GT [Re: Anthony]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17482
Loc: PNW
I'd think you would need to add the LSD additive unless the oil says it already has the proper additive for LSD.

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#4755322 - 05/12/18 07:54 PM Re: 17 Mustang GT [Re: Anthony]
ford46guy Offline


Registered: 06/01/13
Posts: 525
Loc: Albany, NY
Valvoline 75W140 said it had the additive, but the Explorer made a light rubbing noise in turns. I added the additive and it got quiet. If it says it has the additive, listen for any noise, you can always add it.
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#4755354 - 05/12/18 08:36 PM Re: 17 Mustang GT [Re: Anthony]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1534
Loc: Alberta
Originally Posted By: Anthony
Differential has 75w85 in it. Cars prior to 2015 had 75w140 in the solid axles. New cars are IRS. I doubt the thin gear oil was for nothing more than helping meet CAFE requirements. I'm about ready to change the oil to 75w110 Amsoil Severe Gear.

Does anyone here have good experience putting Severe Gear in a Ford LSD without using the Ford LSD additive?


I keep promising myself not to get dragged into high vis versus low vis discussions but consider for a moment that the supplier of the Gear set for the IFS is not related to the supplier of the gear case for the solid axle. Maybe phone them up and discuss it with them.

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#4755371 - 05/12/18 08:51 PM Re: 17 Mustang GT [Re: Anthony]
bdcardinal Offline


Registered: 06/03/05
Posts: 10882
Loc: Santa Barbara, CA
If it has a Torsen, which some do, you do not need an LS additive.
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#4755413 - 05/12/18 09:35 PM Re: 17 Mustang GT [Re: Anthony]
buck91 Offline


Registered: 04/17/12
Posts: 2432
Loc: West Michigan
Originally Posted By: Anthony
Differential has 75w85 in it. Cars prior to 2015 had 75w140 in the solid axles. New cars are IRS. I doubt the thin gear oil was for nothing more than helping meet CAFE requirements. I'm about ready to change the oil to 75w110 Amsoil Severe Gear.

Does anyone here have good experience putting Severe Gear in a Ford LSD without using the Ford LSD additive?


I have always needed FM in my clutch type LSD's. Mostly FOrd trac-lok but also my Eaton Posi. YMMV.
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#4755873 - 05/13/18 12:14 PM Re: 17 Mustang GT [Re: bdcardinal]
dailydriver Offline


Registered: 03/14/06
Posts: 9152
Loc: Pennsylbammyvania
Originally Posted By: bdcardinal
If it has a Torsen, which some do, you do not need an LS additive.


Are they still using the Trac Loks in some of the new IRS diffs?
(The Track Pack/Performance Pack options use the T2R Torsen exclusively, correct?)

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#4755924 - 05/13/18 01:07 PM Re: 17 Mustang GT [Re: Anthony]
Silverado12 Offline


Registered: 02/26/13
Posts: 3088
Loc: Central Virginia
FWIW my IRS in my Challenger calls for 75W-90 oil and I had a groaning/rubbing noise when I first got the car. It sounded like tires rubbing when I went around a sharp low-speed turn except more muffled. I drained out the oil, added the additive (I think it was 4 oz. Lubegard) and filled it up w/75W-90 Valvoline synthetic gear oil and the noise went away. I remember it didn't take much oil to fill it. My 2010 V-6 IRS Challenger called for 75W-140 while the same year V-8 Challengers called for 75W-90. I would use what the mfg recommends. The oil that came out of my Challenger looked good and had 10,000 miles on it, but I wanted to actually look at it instead of just add the additive to the oil already there. I don't know the history of the car as I bought it used w/7,500 miles, so it might have 7,500 quarter miles on it AFAIK.
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#4756028 - 05/13/18 03:29 PM Re: 17 Mustang GT [Re: dailydriver]
bdcardinal Offline


Registered: 06/03/05
Posts: 10882
Loc: Santa Barbara, CA
Originally Posted By: dailydriver
Originally Posted By: bdcardinal
If it has a Torsen, which some do, you do not need an LS additive.


Are they still using the Trac Loks in some of the new IRS diffs?
(The Track Pack/Performance Pack options use the T2R Torsen exclusively, correct?)


Yes, if it has another gear ratio besides 3.73 then it is a clutch type. And it is a T2, not a T2R unfortunately.
_________________________
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1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.

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#4756390 - 05/13/18 10:56 PM Re: 17 Mustang GT [Re: bdcardinal]
dailydriver Offline


Registered: 03/14/06
Posts: 9152
Loc: Pennsylbammyvania
Originally Posted By: bdcardinal
Originally Posted By: dailydriver
Originally Posted By: bdcardinal
If it has a Torsen, which some do, you do not need an LS additive.


Are they still using the Trac Loks in some of the new IRS diffs?
(The Track Pack/Performance Pack options use the T2R Torsen exclusively, correct?)


Yes, if it has another gear ratio besides 3.73 then it is a clutch type. And it is a T2, not a T2R unfortunately.


I certainly HOPE it is a T2R in the GT350s/350Rs? (They really NEED that diff!)
_________________________
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#4756391 - 05/13/18 10:58 PM Re: 17 Mustang GT [Re: bdcardinal]
dailydriver Offline


Registered: 03/14/06
Posts: 9152
Loc: Pennsylbammyvania
Originally Posted By: bdcardinal
Originally Posted By: dailydriver
Originally Posted By: bdcardinal
If it has a Torsen, which some do, you do not need an LS additive.


Are they still using the Trac Loks in some of the new IRS diffs?
(The Track Pack/Performance Pack options use the T2R Torsen exclusively, correct?)


Yes, if it has another gear ratio besides 3.73 then it is a clutch type. And it is a T2, not a T2R unfortunately.


I certainly HOPE that the GT350s/350Rs have the T2R in their center pumpkin, as those monsters NEED that diff in a serious way! wink
_________________________
2016 Ford Fiesta ST
Ravenol REP 5W-30
Amsoil Ea15K51 filter
Motul Gear 300 non-LS 75W-90

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#4756429 - 05/14/18 12:07 AM Re: 17 Mustang GT [Re: Anthony]
zeng Offline


Registered: 09/01/15
Posts: 2145
Loc: Malaysia
There isn't a correct viscosity grade for any particular unit of transmission/differential component.
Use 75W85 for maximum fuel economy(?) on one 'extreme'.
Use 75W140 for maximum components protection on the other 'extreme'.
Use 75W90 or 75W110 for optimum(or compromised) fuel economy, or components protection.
It's application-dependent or individual priority , really.

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#4756452 - 05/14/18 01:43 AM Re: 17 Mustang GT [Re: Anthony]
MetalSlug Offline


Registered: 07/24/10
Posts: 2630
Loc: vicksburg ms
Iím running Motorcraft 75w140 with bottle of FORD lsd addi . Since itís so difficult to change rear diff fluid on my 03 cobra terminator . Because the whole irs need to be drop. I donít think i ever need to change it again. Run smooth . Side note ď I should add a aftermarket cover with drain and fill plug for easy change . But I couldnít see myself add another $300 for the cover on top of $700 I just pay for since the dealer drop it and add new bushing and stuff. That is the most expensive rear diff fluid I ever pay for
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