Diff fluid change-HELP!

[Vlad Soare]

We're familiar with the weight or the viscosity of the oil, how thick it is.

Friction modifiers change how slick or slippery the oil is.

Thanks. I know they modify the viscosity/slickness, but I was curious how they change it in this particular application. Increase, or decrease?
I take it, it decreases it.

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[Cory S]

If I'm not mistaken, chatter during slow speed turning could arise if one wheel wanted to rotate faster than the differential allowed it to. In other words, if the diff weren't open enough. This means the friction modifier decreases friction between the plates. So if we don't add the friction modifier, then the diff will be a bit more slip-limited than usual, as if we increased the preload.
Is my reasoning correct?

Correct. I’ve never heard any chatter myself. It was the occasional older folks back in the day complaining. The potential of the clutches gripping better (and less wear) is more worth it to me without modifier.

 

[Therealmattlex]

I personally use Amsoil and have never had an issue. When I had a Clutch style lsd I used their friction modifier, now with my Torson it's not needed.

 

[Rapid Red]

What does the friction modifier do? Does it increase the friction, in order to enhance the limited slip nature of the diff by making the plates grippier? Or does it decrease it, in order to extend the life of the plates by allowing them to slip easier?

I think you can find the answer to the question you ask
From the horse's mouth
https://torsen.com/faq/
https://torsen.com/category/maintenance/

A tease/taste

• fluid – not Royal Purple, Amsoil, or Mobil1?
  
  The OEM oil is what the axle system was tested – and proven - in by the manufacturer. Many other brands are well-regarded, with reputable products, but we have zero data as to what impact they'll have on performance or durability of the axle as a system. We would still recommend that you refer to you owner’s manual or the manufacturer of the ring & pinion gearing.

I love the cyber chemist that post among us LOL

• 
  How do Torsen® differentials work?
  
  It’s actually quite simple – by creating friction. Friction within the gearing is what resists wheel slip. When torque is applied to the differential, it generates thrust forces on the gears. The gears, in turn, push against the inside walls of the differential case, and that produces friction. In short, the more torque is applied, the more friction is generated, and the more resistance to wheel spin there is. See How it Works on this website.

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