Changed the rear end fluid

[mj]

I'm not sure that's right. Like you said, the Torsen diff is only available on the GT PP. All other Mustangs have the regular clutch-style LSD, which is the type of diff that needs the friction modifier, not the Torsen.

Friction modifiers are specifically for clutch-type LSD's, Torsen diffs use gears and don't need the modifier.

Just my .02

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[Impulsed7]

Its a clutch type diff in the eco PP, only something small like 20% or something lock up from what I remember. I've only used plain old diff fluid on all my clutch types in other cars with no issues.

edit. maybe non perf pack is different? I don't know.

 

[mj]

Here is what the Amsoil site says:

http://www.amsoil.com/mygarage/VehicleLookupPage.aspx?FromIndex=1&url2=2015+FORD+MUSTANG+0

Yes. The Amsoil site itself says that the EB with the LSD needs the friction modifier -- footnote #4.

All EB's have the clutch-type LSD.

 

[Impulsed7]

is this like other cars where I can just add a clutch and plate to add lockup %?

 

[Herr_Poopschitz]

is this like other cars where I can just add a clutch and plate to add lockup %?

If it's setup like previous 8.8s, you can add another friction disc and alternate the friction and steels. I've always rebuilt them as they've come from the factory, using carbon frictions, and had good results - but it depends on how you wish to set it up, ultimately. Another 'trick' is to use an F150 'S' spring to preload the packs.

Interestingly the Amsoil site does say to use the friction modifier. I'm surprised to see this, many synthetics don't require it.

All Mustangs have a clutch type LSD except the GTPP which has the torsen.

I don't see a problem not running the modifier. Will slightly change the characteristics of the diff, and will probably require a rebuild sooner than if it were used.

There really is no reason to change the diff fluid this early if not racing or towing. 30k miles or so may be more appropriate. Maybe find a used Torsen at that time.

 

[greg hazlett]

I do it on the oil/diff fluid on all my rwd vehicles between 500-1000 miles to get break in stuff out and good fluids in the vehicle, not telling anyone else how/what to do.

 

[Ron@cp-e]

I would add friction modifier
just my .02
http://www.americanmuscle.com/frpp-friction-modifier.html

 

[Anthony@HTM]

Before this gets ugly.

I've confirmed with Amsoil twice now that every rear differential that comes on the mustang does not need the modifier if you use Amsoil Severe Gear 75W-90 as it already has friction modifiers built in.

The "Traction Lok" signifies the Torsen rear differential, if you wish to add modifier you can, if you don't there is no harm done.

Anthony

 

[Herr_Poopschitz]

Before this gets ugly.

I've confirmed with Amsoil twice now that every rear differential that comes on the mustang does not need the modifier if you use Amsoil Severe Gear 75W-90 as it already has friction modifiers built in.

The "Traction Lok" signifies the Torsen rear differential, if you wish to add modifier you can, if you don't there is no harm done.

Anthony

Unfortunately, it just became uglier.

Amsoil's own website says to use the modifier...footnote 4. Just for verification, the website is incorrect?

'Trac-Lok' is Ford marketing for limited slip differential. Been that way since I can remember. 'Posi-traction' is GM's verbiage, 'Sure-Grip' is Mopar. All the same thing - traditionally a clutch-style limited slip. This terminology is not limited to just Torsen diffs.

Speaking of Torsen's, they do not require friction modifier, as they don't work based on clutch friction and instead are gear actuated.


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[Anthony@HTM]

It is correct.

I'm saying that if you do not add the modifier you will be fine.

I simply do not get into arguments online, if you want to add it you can. I am in no shape or form telling you what to do.

Unfortunately, it just became uglier.

Amsoil's own website says to use the modifier...footnote 4. Just for verification, the website is incorrect?

'Trac-Lok' is Ford marketing for limited slip differential. Been that way since I can remember. 'Posi-traction' is GM's verbiage, 'Sure-Grip' is Mopar. All the same thing - traditionally a clutch-style limited slip. This terminology is not limited to just Torsen diffs.

Speaking of Torsen's, they do not require friction modifier, as they don't work based on clutch friction and instead are gear actuated.


VS

 

[Herr_Poopschitz]

I simply do not get into arguments online, if you want to add it you can. I am in no shape or form telling you what to do.

...but as a distributor, I would think you would want to educate potential customers. Would also think a distributor would be able to provide a customer w/ the appropriate products for their needs.

You say the modifier is not needed, the Amsoil website says it is...you state the website is correct...so...do we believe you or the website?:shrug:

I've been tempted to try Amsoil based on some of the testing I've read...

 

[greg hazlett]

I can see those points and think they are valid questions.

 

[Anthony@HTM]

...but as a distributor, I would think you would want to educate potential customers. Would also think a distributor would be able to provide a customer w/ the appropriate products for their needs.

You say the modifier is not needed, the Amsoil website says it is...you state the website is correct...so...do we believe you or the website?:shrug:

I've been tempted to try Amsoil based on some of the testing I've read...

It says add friction modifier, it does not say required.

I am trying to explain from Amsoil, that you can add the friction modifier. But no harm will be done if you do not add it.

This is coming from Amsoil, not me.

Amsoil goes great lengths to be fortified with any additives necessary so that you do not have to add anything.

Again I did not say it does not need it, I said that you will be ok if you do not add it.

Since you are concerned then add it.

I will be dropping my subframe and rear differential in a couple weeks and will not be adding it. I will go a step further and get the fluid that's currently in the diff analyzed as well as the Amsoil does a couple thousand miles later.

 

[Herr_Poopschitz]

It says add friction modifier, it does not say required.

...?

Nevermind.

 

[Anthony@HTM]

...?

Nevermind.

Again, not the words out of my mouth. This is from Amsoil.

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