Recent Topics
UOA help decoding what's there
by beanoil. 10/21/18 11:11 AM
Asking for a raise?
by Throt. 10/21/18 11:06 AM
Thinnest oil to protect engine when warming up
by NGRhodes. 10/21/18 10:51 AM
Borescope Piston Top Concerns ?
by Kjmack. 10/21/18 10:41 AM
Make links blue again
by eljefino. 10/21/18 10:31 AM
Mr Heater Propane heater?
by eljefino. 10/21/18 10:28 AM
How stable is Stabil?
by user52165. 10/21/18 10:22 AM
3rd Shift, How To Adjust?
by Delta. 10/21/18 09:54 AM
Looking at Ford Fusions
by krismoriah72. 10/21/18 08:24 AM
Pf 56 AC DELCO FIts What Engines???
by Driz. 10/21/18 07:12 AM
What oil to use and how soon
by neil57. 10/21/18 06:41 AM
Learned Some Realtor Slang The Other Day
by LoneRanger. 10/21/18 05:29 AM
Need advice on some cheap cars
by HorseThief. 10/21/18 02:29 AM
Acdelco Dexos 2 - 5W-40
by virginoil. 10/21/18 01:21 AM
Looking for Good Value H8 49AGM Battery
by 1JZ_E46. 10/20/18 11:01 PM
2018 X3 xDrive 3.0 impressions
by MCompact. 10/20/18 10:13 PM
UOA Pennzoil Plat. 5/40 Euro results
by TurboJW. 10/20/18 09:34 PM
Newest Members
WagonWheel, zsero, fsaid92, KalapanaBlack, oe542
66255 Registered Users
Who's Online Now
103 registered members (53' Stude, beanoil, Astro14, ArrestMeRedZ, aquariuscsm, andyd, 12 invisible), 1,931 guests, and 31 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics292,271
Posts4,877,068
Members66,255
Most Online2,494
Oct 17th, 2018
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
17 Mustang GT #4755302
05/12/18 07:37 PM
05/12/18 07:37 PM
Joined: Sep 2004
Posts: 601
GA
Anthony Offline OP
Anthony  Offline OP
Joined: Sep 2004
Posts: 601
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?


95 Nissan Hardbody V6 - M1 HM 5w30
13 Nissan Titan - Pennzoil Platinum 5w30
17 Ford Mustang GT - Pennzoil Platinum 5w20
Re: 17 Mustang GT [Re: Anthony] #4755308
05/12/18 07:40 PM
05/12/18 07:40 PM
Joined: Jul 2010
Posts: 18,941
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 18,941
PNW
I'd think you would need to add the LSD additive unless the oil says it already has the proper additive for LSD.

Re: 17 Mustang GT [Re: Anthony] #4755322
05/12/18 07:54 PM
05/12/18 07:54 PM
Joined: Jun 2013
Posts: 525
Albany, NY
ford46guy Offline
ford46guy  Offline
Joined: Jun 2013
Posts: 525
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.


95 Tbird V8 240K PP SYNTH ULTRA 5W30
98 MGM 160K M1 HM 5W20
96 Explorer EB V6 159K PP SYNTH HM 5W30
95 Conti 155K MC 5W20
11 GS350 90K PP HM 5W30
Re: 17 Mustang GT [Re: Anthony] #4755354
05/12/18 08:36 PM
05/12/18 08:36 PM
Joined: Dec 2017
Posts: 2,515
SE British Columbia, Canada
Snagglefoot Online content
Snagglefoot  Online Content
Joined: Dec 2017
Posts: 2,515
SE British Columbia, Canada
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.


If you want the job done right......do it yourself.
Re: 17 Mustang GT [Re: Anthony] #4755371
05/12/18 08:51 PM
05/12/18 08:51 PM
Joined: Jun 2005
Posts: 11,412
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,412
Santa Barbara, CA
If it has a Torsen, which some do, you do not need an LS additive.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: 17 Mustang GT [Re: Anthony] #4755413
05/12/18 09:35 PM
05/12/18 09:35 PM
Joined: Apr 2012
Posts: 2,630
West Michigan
buck91 Offline
buck91  Offline
Joined: Apr 2012
Posts: 2,630
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.


2011 F150 4x4 5.0L
1996 Mustang GT 5spd/ragtop
Re: 17 Mustang GT [Re: bdcardinal] #4755873
05/13/18 12:14 PM
05/13/18 12:14 PM
Joined: Mar 2006
Posts: 9,176
Pennsylbammyvania
dailydriver Offline
dailydriver  Offline
Joined: Mar 2006
Posts: 9,176
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?)

Re: 17 Mustang GT [Re: Anthony] #4755924
05/13/18 01:07 PM
05/13/18 01:07 PM
Joined: Feb 2013
Posts: 3,257
Central Virginia
Silverado12 Offline
Silverado12  Offline
Joined: Feb 2013
Posts: 3,257
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.


12 Chevy Silverado ext. cab LS, 2WD 4.3 auto
18 Mustang GT 5.0 auto
07 Harley Dyna Street Bob 96 c.i. 6 sp.
00 Mustang GT auto
Re: 17 Mustang GT [Re: dailydriver] #4756028
05/13/18 03:29 PM
05/13/18 03:29 PM
Joined: Jun 2005
Posts: 11,412
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,412
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.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: 17 Mustang GT [Re: bdcardinal] #4756390
05/13/18 10:56 PM
05/13/18 10:56 PM
Joined: Mar 2006
Posts: 9,176
Pennsylbammyvania
dailydriver Offline
dailydriver  Offline
Joined: Mar 2006
Posts: 9,176
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!)


2016 Ford Fiesta ST
Ravenol REP 5W-30
Amsoil Ea15K51 filter
Motul Gear 300 non-LS 75W-90
Re: 17 Mustang GT [Re: bdcardinal] #4756391
05/13/18 10:58 PM
05/13/18 10:58 PM
Joined: Mar 2006
Posts: 9,176
Pennsylbammyvania
dailydriver Offline
dailydriver  Offline
Joined: Mar 2006
Posts: 9,176
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
Re: 17 Mustang GT [Re: Anthony] #4756429
05/14/18 12:07 AM
05/14/18 12:07 AM
Joined: Sep 2015
Posts: 2,338
Malaysia
zeng Offline
zeng  Offline
Joined: Sep 2015
Posts: 2,338
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.

Re: 17 Mustang GT [Re: Anthony] #4756452
05/14/18 01:43 AM
05/14/18 01:43 AM
Joined: Jul 2010
Posts: 2,653
Dallas TX
MetalSlug Offline
MetalSlug  Offline
Joined: Jul 2010
Posts: 2,653
Dallas TX
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


NO FRAM OCOD " Orange Can Of DEATH ÔŅĹ
03 SVT COBRA 10th anniversary Whipple 600whp M1 5w30 Wix 51372XP
01 Corvette ZO6 stock M1 5w30 / M1-107A
2016 NISSAN TITAN dealer OC daily drive
Re: 17 Mustang GT [Re: Anthony] #4769476
05/27/18 01:47 PM
05/27/18 01:47 PM
Joined: Sep 2004
Posts: 601
GA
Anthony Offline OP
Anthony  Offline OP
Joined: Sep 2004
Posts: 601
GA
Installed the Amsoil 75w110 Severe Gear a couple of days ago. I did not use any friction modifier. So far so good. Car has 8400 miles on it.

I also installed BG Synchro Shift 75w80 GL4 into the transmission. Car comes from factory with Ford Dual Clutch fluid. I haven't noticed much of a difference, but my Transmission has always felt fine so no complaints there.


95 Nissan Hardbody V6 - M1 HM 5w30
13 Nissan Titan - Pennzoil Platinum 5w30
17 Ford Mustang GT - Pennzoil Platinum 5w20

BOB IS THE OIL GUY® Powered by UBB.threads™