Reddit reviews Genuine Ford Fluid XL-3 Friction Modifier Additive - 4 oz.
We found 2 Reddit comments about Genuine Ford Fluid XL-3 Friction Modifier Additive - 4 oz.. Here are the top ones, ranked by their Reddit score.
For use on certain limited-slip differentials to reduce chatter and hypoid gear noise levelsUse according to owner guide recommendationsTapered neck applicator for easy useFormulated for automotive useAdded to lubricants to reduce the surface friction of the lubricated parts
This is a very common problem on these cars. You can add a bottle of the ford friction modifier to resolve the issue. I'm not usually one to recommend a fix in a bottle but we got that one from the ford dealership back in the day and I've probably used it on a hundred or more of them over the years. It fixes the problem instantly.
One word of warning. The stuff stinks... I don't mean it smells bad, I mean it's vomit inducing and lingers forever. They reformulated it a while back so its not as bad as it was but... Be careful not to spill it or get it on you.
I use the friction modifier because it eliminates the differential growling while making tight turns. I'm unsure if it's required or not, I just got tired of the growling, plus I was concerned premature wear of the differential friction plates. Here's what I used:
https://www.amazon.com/Ford-XL-3-Friction-Modifier-Additive/dp/B000NU5LP6/ref=sr_1_1?s=automotive&ie=UTF8&qid=1542378042&sr=1-1&keywords=Ford+Fluid+XL-3
Warning!! The modifier smells like ASS so don't spill on you. Ask me how I know this....