Notices
5.0L GT Modifications Placeholder for future motor based GT's modifications.

Help on Rear Axle Oil

Old 7/14/13, 08:32 PM
  #1  
GT Member
Thread Starter
 
Dinosoar's Avatar
 
Join Date: May 6, 2013
Location: Virginia
Posts: 103
Likes: 0
Received 0 Likes on 0 Posts
Help on Rear Axle Oil

I have 2014 GT with Track Pack....hence the TORSEN Diff. I put on new rear brakes and pulled the diff cover and axles to replace the caliper brackets. I noticed the rear axle oil has friction modifier in there. It is my understanding that friction modifier is for clutch-type limited slip diffs, not for TORSEN diffs.

Am I correct? Can I re-fill with just oil, no modifier? I think I heard that Ford's T2R may have clutch plates too, dunno?

Last edited by Dinosoar; 7/17/13 at 10:54 AM.
Dinosoar is offline  
Old 7/15/13, 08:44 PM
  #2  
GT Member
 
kona stang10's Avatar
 
Join Date: September 10, 2009
Posts: 191
Likes: 0
Received 0 Likes on 0 Posts
Torsen = no modifier, you are correct!
kona stang10 is offline  
Old 7/15/13, 10:33 PM
  #3  
JAJ
V6 Member
 
Join Date: October 24, 2010
Location: Vancouver, BC
Posts: 50
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Dinosoar View Post
I have 2014 GT with Track Pack....hence the TORSEN Diff. I put on new rear brakes and pulled the diff cover and axles to replace the caliper brackets. I noticed the rear axle oil has friction modifier in there. It is my understanding that friction modifier is for clutch-type limited slip diffs, not for TORSEN diffs.

Am I correct? Can re-fill with just oil, no modifier? I think I heard that Ford's T2R may have clutch plates too, dunno?
Your Owner's Manual will say to put the friction modifier in the oil. I have the Torsen in my GT500 Track Pack and that's what's in the manual. They are very specific to add it - the Track Pack cars only come with a Torsen, and because they take additional gear oil to fill the pipes for the front-mounted diff cooler, you have to add 6 ounces of FM instead of the usual 4 ounces.
JAJ is offline  
Old 7/16/13, 09:47 AM
  #4  
V6 Member
 
Blown408's Avatar
 
Join Date: July 13, 2013
Location: Michigan
Posts: 52
Likes: 0
Received 0 Likes on 0 Posts
No modifier check torsion site .
Blown408 is offline  
Old 7/16/13, 12:28 PM
  #5  
Shelby GT350 Member
 
dmichaels's Avatar
 
Join Date: April 14, 2013
Location: CT
Posts: 2,460
Received 109 Likes on 100 Posts
Interested to see how this one plays out - I would like to change rear diff fluid too, seems like he owners manual and TORSEN website disagree
dmichaels is offline  
Old 7/16/13, 02:49 PM
  #6  
GTR Member
 
Ltngdrvr's Avatar
 
Join Date: February 18, 2010
Location: S.E. Texas
Posts: 4,990
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by JAJ View Post
Your Owner's Manual will say to put the friction modifier in the oil. I have the Torsen in my GT500 Track Pack and that's what's in the manual. They are very specific to add it - the Track Pack cars only come with a Torsen, and because they take additional gear oil to fill the pipes for the front-mounted diff cooler, you have to add 6 ounces of FM instead of the usual 4 ounces.
What "front mounted differential cooler"???

Someone has been telling you fairy tales...

And it certainly won't hurt anything to put friction modifier in a torsen diff, just doesn't need it.
Ltngdrvr is offline  
Old 7/16/13, 03:10 PM
  #7  
V6 Member
 
Blown408's Avatar
 
Join Date: July 13, 2013
Location: Michigan
Posts: 52
Likes: 0
Received 0 Likes on 0 Posts
The friction modifier is so the clutch plates don't chatter in a limited slip diff, yours and my soon to be stangs don't have plates they have gears and springs. I would not put it in ,just use a good syn gear lube.I like red line products myself!
Blown408 is offline  
Old 7/16/13, 09:01 PM
  #8  
GT Member
Thread Starter
 
Dinosoar's Avatar
 
Join Date: May 6, 2013
Location: Virginia
Posts: 103
Likes: 0
Received 0 Likes on 0 Posts
Yeah, I don't think I will add it. I think Ford just got cheap. They realized it won't hurt it, so they just keep one diff filler station on the assembly line. Why bother with a second tank of pure oil they're thinking, I guess. Although, I wonder if FM has some quality, by coincidence, that it allows the oil to manage heat better...just a silly a$$ guess, but why would Ford spend the money to fill cars with it that don't need it? Could it just be convenience on the production line?

Beside, that FM stuff smells like something died!

Thanks for the help.

Last edited by Dinosoar; 7/16/13 at 09:05 PM.
Dinosoar is offline  
Old 7/16/13, 09:13 PM
  #9  
Bullitt Member
 
Join Date: April 26, 2013
Location: Lebanon, MO
Posts: 280
Likes: 0
Received 0 Likes on 0 Posts
That FM is probably possum grease.
Missouri Hoss is offline  
Old 7/16/13, 10:21 PM
  #10  
JAJ
V6 Member
 
Join Date: October 24, 2010
Location: Vancouver, BC
Posts: 50
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Ltngdrvr View Post
What "front mounted differential cooler"???

Someone has been telling you fairy tales...

And it certainly won't hurt anything to put friction modifier in a torsen diff, just doesn't need it.
It's a 2014 GT500 with the Track Pack option. It comes equipped with a 662 horsepower oil heater!

The cooling duct on the passenger's side of the lower opening on the front valence below the bumper feeds the diff cooler radiator.

Last edited by JAJ; 7/16/13 at 10:48 PM.
JAJ is offline  
Old 7/16/13, 10:55 PM
  #11  
JAJ
V6 Member
 
Join Date: October 24, 2010
Location: Vancouver, BC
Posts: 50
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Dinosoar View Post
Yeah, I don't think I will add it. I think Ford just got cheap. They realized it won't hurt it, so they just keep one diff filler station on the assembly line. Why bother with a second tank of pure oil they're thinking, I guess. Although, I wonder if FM has some quality, by coincidence, that it allows the oil to manage heat better...just a silly a$$ guess, but why would Ford spend the money to fill cars with it that don't need it? Could it just be convenience on the production line?

Beside, that FM stuff smells like something died!

Thanks for the help.
I won't argue with your logic to leave it out; I agree with your logic on the prospect of the "just one way to do it" in manufacturing but they don't actually do it that way for some reason. First, why bother making it two separate items - just blend them from the supplier and forget about the extra bottle. But they didn't do that.

The other issue, again unique to the GT500, is the gear oil itself. Ford equips the GT500 diff with a 75w-85 diff lube - the same viscosity as many manual transmissions. And, even when they go to the trouble of installing a completely different diff lube, they still add the extra FM to it, 4 ounces for the regular diff and 6 ounces for the track pack (you know, the one with the front-mounted diff cooler).

What the Torsen website actually says about OEM T2 installations is to "follow the owner's manual" regarding FM. For the aftermarket units, they say to leave it out, but otherwise it's the OEM's choice.
JAJ is offline  
Old 7/17/13, 10:52 AM
  #12  
GT Member
Thread Starter
 
Dinosoar's Avatar
 
Join Date: May 6, 2013
Location: Virginia
Posts: 103
Likes: 0
Received 0 Likes on 0 Posts
The only other theory I could think of is Ford believes the FM helps preserve the pinon and axle seals longer than pure oil. (?) Otherwise, I am totally confused as to why they'd require FM on a non-clutch type diff.
Dinosoar is offline  
Old 7/17/13, 11:08 AM
  #13  
V6 Member
 
Blown408's Avatar
 
Join Date: July 13, 2013
Location: Michigan
Posts: 52
Likes: 0
Received 0 Likes on 0 Posts
Money ! Sure will sell a lot of it . We stang owners tend to take care of our cars , how many people change there rear end fluid.
Blown408 is offline  
Old 7/17/13, 11:42 AM
  #14  
GTR Member
 
Gabe's Avatar
 
Join Date: August 7, 2011
Location: NH
Posts: 4,927
Received 356 Likes on 307 Posts
This is what I used when I changed it out at 10k miles, a custom-blended oil and it had friction modifier pre-mixed in:

Name:  2013-03-26_QB-oil-3_zps93689fa6.jpg
Views: 334
Size:  193.7 KB
Gabe is offline  
Old 7/17/13, 12:22 PM
  #15  
V6 Member
 
Blown408's Avatar
 
Join Date: July 13, 2013
Location: Michigan
Posts: 52
Likes: 0
Received 0 Likes on 0 Posts
Just checked Redline and they have a FM in there gear oil. I think any good gear oil will have some type of FM in it . I wouldn't worry about it to much, I have no used it and not no real difference , no breakdowns.
Blown408 is offline  
Old 7/18/13, 09:41 AM
  #16  
GT Member
Thread Starter
 
Dinosoar's Avatar
 
Join Date: May 6, 2013
Location: Virginia
Posts: 103
Likes: 0
Received 0 Likes on 0 Posts
"Partnerships"

I often just think Ford (everyone really) just has partnerships with other business/products. You all remember the BP symbol on your fuel cap. I am sure other fuel was find, but somehow Ford though BP was best...whatever. And of course, their own Motorcraft parts on the only ones "recommended" in most cases...again, whatever. I don't have a problem with product promotion...I have a problem when that clouds the real issue...like what oil, fuel to use, or whether or not to use FM in a diff without a friction-based component like a clutch device. Whatever.

It all comes with the territory of being an car enthusiast and that's why these sites and the Mustang community is so great.
Dinosoar is offline  
Old 7/18/13, 11:16 AM
  #17  
V6 Member
 
Blown408's Avatar
 
Join Date: July 13, 2013
Location: Michigan
Posts: 52
Likes: 0
Received 0 Likes on 0 Posts
+1 well said !
Blown408 is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
dblhelx
GT
5
10/6/15 08:08 PM
samjluck
5.0L GT Modifications
7
9/17/15 10:24 PM
speedform
Vehicles For Sale
5
9/11/15 06:31 PM
Evil_Capri
Mustang Motorsports
1
9/11/15 08:39 AM


Thread Tools
Search this Thread
Quick Reply: Help on Rear Axle Oil


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.