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  #1  
Old 05-04-2011, 07:01 PM
Ford Tough
 
Join Date: Dec 2010
Posts: 417
Default friction modifier

i have a torsen limited slip in my truck and am going to change the rear axle fluid. do I need to use a friction modifier, or not? I know the torsen is NOT a clutch driven unit, as are the stock ford trac-lok axles. I have the 75W-140 rear end fluid from motorcraft, as well as friction modifier, just not sure if I should use it. the parts counter guys told me they weren't sure if it needs it or not, but that it wouldn't hurt to put it in there.
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  #2  
Old 05-04-2011, 07:21 PM
Almost ******
 
Join Date: Mar 2011
Posts: 7,482
Default Re: friction modifier

i've always put, and been told to put, friction modifier in my axle with a factory L/S.
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  #3  
Old 05-04-2011, 07:25 PM
Ford Tough
 
Join Date: Jun 2009
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Default Re: friction modifier

Contact Torsen.
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  #4  
Old 05-05-2011, 04:30 PM
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Join Date: Jan 2010
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Default Re: friction modifier

http://www.torsen.com/fsae/fsaefaq.htm


Quote:
8. What should I use for lubrication?

A GL-4 or GL-5 gear oil is required by Torsen Type 1 units. This oil provides high-pressure additives needed to prevent the oil from breaking down under the extreme conditions generated by the tooth mesh. A 75W-90 is recommended, but higher or lower viscosities can be used if they meet GL-4 or GL-5 specification. Either synthetic or conventional oils can be used as well.
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  #5  
Old 05-05-2011, 04:41 PM
Joshua 24:15

 
Join Date: May 2009
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Default Re: friction modifier

yes you do put it in. that is what ive always heard. it will only help
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  #6  
Old 05-05-2011, 04:45 PM
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Default Re: friction modifier

the torsen is a worm gear type limited slip similar to the detroit tru trac and does not require friction modifier like the ford trac-loc LS unit does.
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  #7  
Old 05-05-2011, 04:46 PM
Joshua 24:15

 
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Default Re: friction modifier

well ive always been wrong lol
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  #8  
Old 05-05-2011, 04:49 PM
Jeep recovery vehicle
 
Join Date: Jan 2010
Posts: 2,194
Default Re: friction modifier

Quote:
Originally Posted by dixie_boysles View Post
yes you do put it in. that is what ive always heard. it will only help
you do not what it does right? friction modifiers cause the clutches of a normal clutch based LSD to slip. it helps prevent wear to them increasing life. however doing so it cause them to slip more and work less.
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  #9  
Old 05-06-2011, 10:50 AM
Ford Tough
 
Join Date: Dec 2010
Posts: 417
Default Re: friction modifier

here's what I got back from Torsen
Quote:
Our test vehicle has run with the friction modifier so we cannot say whether you need it or not. You would probably be best served by adding it to your rear axle oil.
looks like I'll be putting it in!
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  #10  
Old 05-06-2011, 10:51 AM
Get Lifted.
 
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Default Re: friction modifier

Good choice.
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