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Jul 02, 2019
For ford F150 limited slip diff' + this stuff works!
2 of 2 found this helpful I had my 2011 f150 differential serviced & after I noticed a binding noise coming from the rear of the truck. I ask friends and all said certain limited slip Diff's needed a additive added to the standard as well. I googled this and found that the noise was actually called Hypoid Gear Noise, where vibrations created by the meshing action of bevel and hypoid gears operating in a drive system often result in gear noise. Which lead to the addition of the friction modifier. I added the Ford Motorcraft OEM XL3 Friction Modifier Additive (hence, add) for limited slip diff's. No more noise.