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Best gear oil for 06 Mustang 4.6 auto? #4715971
04/04/18 08:38 AM
04/04/18 08:38 AM
Joined: Jul 2007
Posts: 174
Phoenix AZ
gmh101357 Offline OP
gmh101357  Offline OP
Joined: Jul 2007
Posts: 174
Phoenix AZ
Do you have to add the Ford rear end emulsifier?
I was told to use this and RP gear oil when i replace the pinion gear seal

Re: Best gear oil for 06 Mustang 4.6 auto? [Re: gmh101357] #4716043
04/04/18 09:36 AM
04/04/18 09:36 AM
Joined: Aug 2013
Posts: 435
Alberta
tcp71 Offline
tcp71  Offline
Joined: Aug 2013
Posts: 435
Alberta
If it's limited slip, you need friction modifier. Honestly, I would put redline 75w140 gear oil in there along with a bottle of friction modifier. RP will probably work fine, but redline oils have always worked well for me.

https://www.amazon.com/Red-Line-Limited-...iction+modifier

https://www.amazon.com/Red-Line-57104-75...torcraft+75w140


2016 F150 Eco: Edge 0w40
2005 Sienna 3.3: mobil 0w40 (varies)
Re: Best gear oil for 06 Mustang 4.6 auto? [Re: gmh101357] #4716083
04/04/18 10:22 AM
04/04/18 10:22 AM
Joined: May 2009
Posts: 12,304
N.H, U.S.A.
ARCOgraphite Offline
ARCOgraphite  Offline
Joined: May 2009
Posts: 12,304
N.H, U.S.A.
Auto? No Mods?

Nothing special warranted

Royal Purple? WhaTS THAT gonna DO FOR YOU?


2019 VW Jetta S,6M OCI#0 62mi-Castrol Edge Prof VW508+OE Filter; '17 Subaru Crosstrek CVT OC#5 37K mi-SOA/Idemitsu 0w20 + SOA Filter
Re: Best gear oil for 06 Mustang 4.6 auto? [Re: ARCOgraphite] #4716110
04/04/18 10:50 AM
04/04/18 10:50 AM
Joined: Jul 2007
Posts: 174
Phoenix AZ
gmh101357 Offline OP
gmh101357  Offline OP
Joined: Jul 2007
Posts: 174
Phoenix AZ
Somebody gave it to me ....75w 140....why buy if its ok to use...
do you need the modifier with auto trans?

Re: Best gear oil for 06 Mustang 4.6 auto? [Re: gmh101357] #4716118
04/04/18 11:00 AM
04/04/18 11:00 AM
Joined: Aug 2017
Posts: 164
Displaced Texan in Mexico City
Gimpy1 Offline
Gimpy1  Offline
Joined: Aug 2017
Posts: 164
Displaced Texan in Mexico City
Most synthetic gear oils come with Friction Modifier (FM). Redline has a synthetic gear oil that does NOT have any FM (75w140 NS). Each manufacturer also adds different amounts of FM to their gear oils. What does the OEM recommend? I would start there. A stock diff on a stock car really doesn't need special fluids. I would go onto some of the Ford 4.6 forums and see what those guys are using, especially since different gear oils have varying amounts of FM in them. You may even have to add an additional amount of FM. If I where you I'd check the forums first.

Re: Best gear oil for 06 Mustang 4.6 auto? [Re: gmh101357] #4716130
04/04/18 11:15 AM
04/04/18 11:15 AM
Joined: Aug 2017
Posts: 164
Displaced Texan in Mexico City
Gimpy1 Offline
Gimpy1  Offline
Joined: Aug 2017
Posts: 164
Displaced Texan in Mexico City
Originally Posted By: gmh101357
Somebody gave it to me ....75w 140....why buy if its ok to use...
do you need the modifier with auto trans?

I think you're a bit confused. The differential is at the REAR axle it allows the rear tires to turn at different speeds during a turn. The diff is connected to the transmission (either manual or Auto) via the drive shaft and is a completely different component from the trans. DO NOT PUT FRICTION MODIFIER IN YOUR TRANSMISSION!!!. I'm not trying to be a jerk but you may want to get a Hays, Chilton or Factory Service Manual for your cars since it appears that you are inexperienced with Auto repair. Please do some research first and make sure you 100% sure that you can handle this fluid change, since adding gear oil and FM to an A/T would destroy it.

Re: Best gear oil for 06 Mustang 4.6 auto? [Re: Gimpy1] #4716291
04/04/18 01:29 PM
04/04/18 01:29 PM
Joined: Jul 2007
Posts: 174
Phoenix AZ
gmh101357 Offline OP
gmh101357  Offline OP
Joined: Jul 2007
Posts: 174
Phoenix AZ
Originally Posted By: Gimpy1
Originally Posted By: gmh101357
Somebody gave it to me ....75w 140....why buy if its ok to use...
do you need the modifier with auto trans?

I think you're a bit confused. The differential is at the REAR axle it allows the rear tires to turn at different speeds during a turn. The diff is connected to the transmission (either manual or Auto) via the drive shaft and is a completely different component from the trans. DO NOT PUT FRICTION MODIFIER IN YOUR TRANSMISSION!!!. I'm not trying to be a jerk but you may want to get a Hays, Chilton or Factory Service Manual for your cars since it appears that you are inexperienced with Auto repair. Please do some research first and make sure you 100% sure that you can handle this fluid change, since adding gear oil and FM to an A/T would destroy it.



Acually the opposite....what I was asking if its something (modifier) thats used in diff does it matter if its auto or 6 speed etc.
I thought most rear end oil nowdays came with it in some form as one guy stated.... guess ford is diff.....this is the ford ive ever owned ....most car manufacture's
do not recommend the use of oil additives.....engine/trans or rear

Re: Best gear oil for 06 Mustang 4.6 auto? [Re: gmh101357] #4716318
04/04/18 02:04 PM
04/04/18 02:04 PM
Joined: May 2010
Posts: 1,179
Ocala, Florida
racin4ds Offline
racin4ds  Offline
Joined: May 2010
Posts: 1,179
Ocala, Florida
If its used in a performance application, use less or NO FM, makes the clutches lock up better wink I ran NO modifiers in my 95 Cobra track car, factory traclok diff worked quite well and I never did notice any issues when street driving.

All the additive does is make the clutches in the diff slip when going slow in a sharp turn, keeps them from "chattering" mine never did though in any of my Fords


Just say NO to thin oils and M1!
05 F350 Powerstroke
05 Hyundai Tucson
08 Legacy GT
Re: Best gear oil for 06 Mustang 4.6 auto? [Re: racin4ds] #4716372
04/04/18 03:26 PM
04/04/18 03:26 PM
Joined: Sep 2014
Posts: 2,193
US-WA
Dyusik Offline
Dyusik  Offline
Joined: Sep 2014
Posts: 2,193
US-WA
Thanks for that, I just did my 8.8 lsd in the Jeep too, and my capacity is 3.5 + qts.was debating whether or not buy another thing of fm. I did do the + clutch - steel arrangement. Hopefully the lack of FM will help with low speed lockup too.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 104K STP syn HM 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
14 RX450h 37k Idemitsu 0w20, 57047
Re: Best gear oil for 06 Mustang 4.6 auto? [Re: gmh101357] #4716512
04/04/18 06:10 PM
04/04/18 06:10 PM
Joined: Oct 2004
Posts: 8,467
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 8,467
Cincinnati, OH, USA
RP has friction modifier in it already, you don't have to add it. I've used it in several limited slips, it's worked fine in all of them. Currently in both axles of the Ram in my sig.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)

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