Rear and front diff fluid

[Munks96stroker]

I am going to change fluid in the rear and front diffs and will use royal purple with additive. My question is whether or not I need to add more friction additive or if what royal purple puts in their product is sufficient.

[Bad Night]

You don't need anything in the front for sure , it's an open diff . The rear I never put it back in unless I get some chatter but you shouldn't need it . Just put the Royal purple in and drive it . If on sharp turns you feel the rear end "popping or chattering" then add the friction modifier . If you add the modifier get it from Ford , the other brands don't seem to work . Just so you the modifier is only to allow the clutches to slip . This is only for sharp turns . It does nothing else .

[Munks96stroker]

Now thtas exactly what i needed to hear. Thanks man