What dif fluid is everyone using?

[CarTramrod]

Will be installing gforce axles in the next few weeks and figure i may as well change the diff fluid since I have 40k miles on the car. Car has stage 3 Ben calimers mt82, catless longtubes,weld beadlocks with mt et street r's, and I have a whipple stage 2 ordered.

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[Eyesac]

I use Mobil 1 75W90, no modifiers, never noticed any increase in noise from the stock fluid...

 

[MiamiGT350]

Swapped OEM fluid with BG Ultra Guard LS from Optimum Performance. Feels much smoother and slightly lower temps. Recommended!

 

[1 old racer]

redline 75w85

 

[SheepDog]

Amsoil 75-110

 

[ice445]

I use the Valvoline 75W90 squeeze pouches. The modifier included seems perfect for the trak lok because it feels the same in operation as it did with the stock fluid.

 

[GregO]

Will be installing gforce axles in the next few weeks and figure i may as well change the diff fluid since I have 40k miles on the car. Car has stage 3 Ben calimers mt82, catless longtubes,weld beadlocks with mt et street r's, and I have a whipple stage 2 ordered.

3.73 Torsen, correct ?

 

[cerbomark]

I use the Valvoline 75W90 squeeze pouches. The modifier included seems perfect for the trak lok because it feels the same in operation as it did with the stock fluid.

I also used the Valvoline synthetic AND the Ford modifier even though the Valvolaine says "with modifier " .

 

[John S]

Why does the Torsen application use a friction modifier when there are no clutch plates to chatter/grab?

 

[Eyesac]

Why does the Torsen application use a friction modifier when there are no clutch plates to chatter/grab?

I read somewhere that they can make noise without the modifier. I've put regular gear oil in multiple torsen diffs and never experienced more noise...

 

[robvas]

Why does the Torsen application use a friction modifier when there are no clutch plates to chatter/grab?

https://torsen.com/tbr-lube-friction-modifier/

This begs the question of whether or not friction modifier is actually necessary in a Torsen. Like I said earlier, the modifier is beneficial in smoothing out the operations of friction devices. However, because our friction properties are different than that of a clutch plate differential, you might not see the same symptoms of stick-slip behavior that those would. As noted, clutch plate differentials have a distinct tendency to chatter without friction modifier in the oil, and that chattering can become very objectionable. So, the modifier is essentially a requirement.

In a helical gear diff, however, the stick-slip tends to show up as an audible noise, described by some as a “rusty screw” noise, or as a squeak or moan. You tend to hear it in very low-speed turns, when the steering is at or near full-lock. So, you might hear it while maneuvering in a parking lot, or turning the car around in your driveway. This noise is, as I said, just a characteristic of the friction properties, and is normal. But, if you hear it a lot and it annoys you, adding a few ounces of friction modifier to the axle lubricant will almost always eliminate it. So, the bottom line is it’s up to you.

 

[cerbomark]

auto parts stores carry it. It s such a tiny amount (4oz).

 

[WD Pro]

auto parts stores carry it. It s such a tiny amount (4oz).

And it smells awesome …

WD

 

[barron64]

Mobile Delvac 1, 75w-90 fully synthetic heavy duty use. You can buy it in gallon size for a better price point. Gear oil price by the quart, has gotten ridiculous in the last few years.

 

[GregO]

Motul comp gear 75W-140 in my Torsen with NO modifier added. Fluid swapped twice in 60,000 street miles. No mpg loss. No stupid noises either.

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