Friction Modifier Works

[mullens]

I know it's normal but I couldn't take that blasted rear end groan while making tight turns anymore. I didn't feel like going through the hassle of making a service appointment so I bit the bullet an spent $12 on Ford friction modifier (that's what the service dept. would do anyway.) I put it in and low and behold, no more noise. That stuff should have been added at the factory.

[Son of GT]

I know it's normal but I couldn't take that blasted rear end groan while making tight turns anymore. I didn't feel like going through the hassle of making a service appointment so I bit the bullet an spent $12 on Ford friction modifier (that's what the service dept. would do anyway.) I put it in and low and behold, no more noise. That stuff should have been added at the factory.

 

 

 

That's great, but please be careful. Too much FM will prevent the clutchs (clutch pac) from engaging and that will defeat the limited slip properties of the differental.

 

Do a couple of burnouts (safely, in a safe place of course) and check to make sure that you still make two patches on the ground.

[Light66]

I know it's normal but I couldn't take that blasted rear end groan while making tight turns anymore. I didn't feel like going through the hassle of making a service appointment so I bit the bullet an spent $12 on Ford friction modifier (that's what the service dept. would do anyway.) I put it in and low and behold, no more noise. That stuff should have been added at the factory.

 

 

Let us know how long it lasts. I am sure many are interested.

[mullens]

Will do. I used the 4 oz bottle listed in the TSB, one of which spilled on the garage floor. So, as it seems 3oz appears to work. I'll keep you posted.

[mere44]

Will do. I used the 4 oz bottle listed in the TSB, one of which spilled on the garage floor. So, as it seems 3oz appears to work. I'll keep you posted.

 

 

Yep that will do the trick, the factory does put modifier in but sometimes it's not enough. You did the right thing, that is what the TSB is for. You could have also taken it to the dealership and explained the problem and they would have done it for you under warranty but 12 bucks isn't too bad.

[mullens]

Took it out for a little "spin" tonight. Laid down two nice posi traction patches, so the limited slip is working just fine. Man I love this 50 degree boost friendly weather! I just hope the noise reduction lasts...we'll see.

 

I'm all for avoiding the dealer, for 12 bucks it's worth it. I'll save my warranty work for the expensive stuff.

[GT500 rolls]

Thanks for the update - you don't have that part number handy by chance do you?

[mullens]

Ask for XL3 friction modifier. I found this link to give you an example. They only want $5 but I went to Ford and got it.

 

http://www.xtremediesel.com/motorcraftadditivefrictionmodifier.aspx

[GT500 rolls]

Ask for XL3 friction modifier. I found this link to give you an example. They only want $5 but I went to Ford and got it.

 

http://www.xtremedie...onmodifier.aspx

 

 

Thanks - appreciated.

[BigDan]

Isnt that Motorcraft friction modifyer the worst smelling fluid in the garage. Make sure you cap it and throw it outside or else it will stink up the whole garage. It makes for a good practical joke if you leave an empty bottle in someones garage or car.

[shel-b001]

Took it out for a little "spin" tonight. Laid down two nice posi traction patches, so the limited slip is working just fine. Man I love this 50 degree boost friendly weather! I just hope the noise reduction lasts...we'll see.

 

I'm all for avoiding the dealer, for 12 bucks it's worth it. I'll save my warranty work for the expensive stuff.

 

 

Yes those clutch packs need f/m had the same problem with my 98` Ford F-150 when I Changed to Syn rear oil & forgot to add it . The noise started a week later ,added Ford F/M & haven`t had a noise since (3 years).

[mullens]

Isnt that Motorcraft friction modifyer the worst smelling fluid in the garage. Make sure you cap it and throw it outside or else it will stink up the whole garage. It makes for a good practical joke if you leave an empty bottle in someones garage or car.

 

OMG yes. Be real careful. I had to throw out the clothes I was wearing. After I washed them they still had the smell!

[enormous]

Isnt that Motorcraft friction modifyer the worst smelling fluid in the garage. Make sure you cap it and throw it outside or else it will stink up the whole garage. It makes for a good practical joke if you leave an empty bottle in someones garage or car.

 

Or leave a small drop or two on on a co-workers desk. The guy that you don't like.

Years ago a friend found out that his wfe was having an affair. They divorced and she took him to the financial cleaners. She used his money to purchase a new Corvette ragtop. A few drops of Motorcraft friction modifyer in a syringe shot through the ragtop onto the carpet was his only small smelly revenge

[mixxer]

We use 1 bottle in every gear job we do.!

[GT500 rolls]

Went to the dealer this week to have the groan checked out. They heard the noise and checked with Ford. Apparently the 2010's make that noise as a normal sound and they are shipped with friction modifier already added. Doesn't make sense that the noise can be stopped by using friction modifier but they say it already has it and that it is otherwise normal.

 

Here is the note on my $0 invoice from service.

 

"20985 2007-2010 Mustang GT 500, 2010 Mustang GT equipped with trackpack, 2008-2009 Bullitt - Carbon Fiber Limited Slip - Noise - Normal Characteristics.

 

The Mustang Bullett and GT500 limited slip diffferentials are equipped with heavy duty/racing type carbon fiber clutches. This type of limited slip differential may exhibit a chatter or moan/groan noise when making sharp low speed turns. These noises are a normal characteristic of the heavy duty/racing type limited liip differential. Note: driving the vehicle in a tight figure eight pattern 5 times may lessen the complaint for a short period of time.

 

Effective deate: 09/21/2009"

 

[mullens]

I have a problem with Ford "normal" sometimes. If that''s the case, why is there a TSB? I'm sure there is some friction modifier added at the factory, but apparently it's not enough. The small amount I added cured the problem completely. And regardless of what Ford says, there's nothing normal about that sound. It was driving me crazy.

[6-Speed]

I have a problem with Ford "normal" sometimes. If that''s the case, why is there a TSB? I'm sure there is some friction modifier added at the factory, but apparently it's not enough. The small amount I added cured the problem completely. And regardless of what Ford says, there's nothing normal about that sound. It was driving me crazy.

 

Don't mean to be argumentative, but TSB 08-5-10 never applied to the GT500, only the 05-07 Mustang GT. I don't know whether a newer related TSB was ever released. I'm not implying that adding friction modifier won't work as a solution for some, but it did not work for me.

 

Since installing the FR axle girdle, which increases fluid capacity and filling with Royal Purple Gear Oil, I no longer hear the groaning noise from my axle.

[roadpig58]

Don't mean to be argumentative, but TSB 08-5-10 never applied to the GT500, only the 05-07 Mustang GT. I don't know whether a newer related TSB was ever released. I'm not implying that adding friction modifier won't work as a solution for some, but it did not work for me.

 

Since installing the FR axle girdle, which increases fluid capacity and filling with Royal Purple Gear Oil, I no longer hear the groaning noise from my axle.

 

absolutely- the tsb has nothing to do with gt500s and the special carbon ceramic material used in the clutch packs-- you can have a problem with the noise- but thats the price of admission when you try and put 400-500 horses down on the street and have some kind of reliability- these vehicles are not lincoln town cars- sometimes materials have to be used to supply that reliability in a street car- it is what it is- roadpig

[roadpig58]

absolutely- the tsb has nothing to do with gt500s and the special carbon ceramic material used in the clutch packs-- you can have a problem with the noise- but thats the price of admission when you try and put 400-500 horses down on the street and have some kind of reliability- these vehicles are not lincoln town cars- sometimes materials have to be used to supply that reliability in a street car- it is what it is- roadpig

 

and-ps- the only thing the added friction modifier did was degrade the performance of the clutch packs in that gt500

[mullens]

Hey guys..no arguments here. I can only give you my experience.

 

-It groaned like hell with any turn tighter than 90 deg

-Approx, 3 oz of friciton modifier completley eradicated the noise

-My limited slip works just fine...I even did some extra burnouts to be sure.

 

Just sharing info...what you do with your ride is completely up to you. Enjoy..

[GT500 rolls]

Well I guess I'll just condition my thinking to this being part of the price for the Shelby high performance benefits. I'm on record with them, if there is ever an issue with failure they will be sporting the cost. I'll either turn up the stereo or fishtail around corners from now on to mask the noise if I don't want to hear it

[bpmurr]

My car has 7k on it now and groaning really bad. I'm going to try friction modifier and see what happens.

[ChrisSD]

Fixed my 07 GT, fixed my 10 GT500.

[mullens]

Well I guess I'll just condition my thinking to this being part of the price for the Shelby high performance benefits. I'm on record with them, if there is ever an issue with failure they will be sporting the cost. I'll either turn up the stereo or fishtail around corners from now on to mask the noise if I don't want to hear it

 

I see your point. Some of us have a higher "annoyance tolerance" than others. Personally, I prefer not to have my 50k car sounding like a wounded buffalo going around corners. Especially when the fix is $12 and 15 min.

[bpmurr]

I see your point. Some of us have a higher "annoyance tolerance" than others. Personally, I prefer not to have my 50k car sounding like a wounded buffalo going around corners. Especially when the fix is $12 and 15 min.

 

 

How involved is the process? I have a friend who has helped me out on things. He works at a local body shop and is a good wrench and very detail oriented.

[mullens]

How involved is the process? I have a friend who has helped me out on things. He works at a local body shop and is a good wrench and very detail oriented.

 

VERY simple. Remove the plug on the front of the diff housing, add friction modifier. The hardest part is jacking up the car.

[03 DSG Snake]

Royal Purple supposedly already has Friction Modifier, so I don't see that it would be needed with that fluid?

 

 

All viscosities of Max-Gear are formulated with hypoid friction modifiers necessary for use in clutch or cone type differentials. No additional additives are necessary.

 

http://www.royalpurple.com/gear-oil.html

 

[6-Speed]

Royal Purple supposedly already has Friction Modifier, so I don't see that it would be needed with that fluid?

 

I use RP Maxgear without any additional friction modifiers. There's no more groaning noise from my differential.

[SmellSoGood]

I see your point. Some of us have a higher "annoyance tolerance" than others. Personally, I prefer not to have my 50k car sounding like a wounded buffalo going around corners. Especially when the fix is $12 and 15 min.

 

 

Right on. A 50k car should not have an abnormal sound. If every car 50k+ 500HP+ car sounded like this, then I would say it's normal.

[shel-b001]

Heres what happened to my F-150 8.8 posi. Bearing went so when it was changed I installed RP Maxi gear . Two weeks later had a noise in the rear (Groan). I added friction modifer & it hasn`t made a noise since thats 2.5 years ago.