Friction modifier

daveg

Club Member
How critical is it in a used rear? I am planning on swapping axles and need to remove the cover to do so. I can get lube, but friction modifer is harder to come by.
 
Everytime I sell a Ford axle to someone and they call me complaing about noise, I ask them if they used FM...and they're like WHATTT??? I send them to my rear end shop, they put it in and the noises go away. I would use it.
 
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