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Tech Question, 2008 FX4


enjr44

Well-Known Member
U.S. Military - Veteran
Joined
Mar 24, 2013
Messages
1,143
Age
81
City
Renton, WA
Vehicle Year
02 2X4; 08 FX4
Transmission
Automatic
2008 FX4 with the Torsen differential.

I am confused about changing the differential lubricant?? I know that the FX4 calls for XY-75W140-QL, WSL-M2C192-A, and SAE 75W-140 Synthetic Rear Axle Lubricant (which is different than the “other” 08 Rangers.

Now the confusion, this chart also calls for adding XL-3 friction modifier. https://www.fcsdchemicalsandlubricants.com/main/quickref/axlelube.pdf

But, I don’t understand why? A Torsen differential does not have clutch packs so why would you add a friction modifier??

OK, since I am here, the same chart and owner’s manual calls out XY-80W90-QL, WSP-M2C197-A, SAE 80W-90 Premium Rear Axle Lubricant for the front differential. Since there is a Torsen in the rear, is that still right?

Thank, Ed
 
The Torsen unit does not require friction modifier, nor does it's presence in the rear diff affect the fluid spec for the front diff.
 
There is no call out for a friction modifier for the rear Torsen in my Ranger. I don't see a need for one either. It just specifies synthetic 75W-140. You should follow the book for the front differential. Although, I don't follow it exactly as I use 75W-90 because it is more readily available in synthetic than 80W-90.

When I had the Torsen installed in the front of my Ranger, I asked their engineer if I should use 75W-140 since that is what Ford specifies for the rear Torsen. He said I should still use what is specified by Ford for the front. He said using the lower viscosity gear lube would increase the torque bias a little for the Torsen but not significantly.
 

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