Gear oil

[DJM]

SO got a question about the rear gear oil I was gona swap my cover with an 08 one and Was looking at putting in the Royal Purple oil for the rear do I still need to add the friction modifier or not for the POS limited slip.

[TXsmoker]

i changed the rear diff fluid in mine just cause it was time and i didnt add any modifier Then drove it around and it didnt catch on tight figure eights but when i stomped on it i had two black streaks!!!!!

[03_Turbo7.3]

it doesnt hurt to toss in some ford diff additve.

[nismofan240]

royal purple already has friction mod in it, but who knows how much. i run amsoil diff fluid because it doesnt have any in it, that way when i add the modifier i know exactly how much is going in it. if you run to much than its useless anyway, the ratio has to be pretty close to get real efficiant results.

[DJM]

Well I will give it a try and see what happens.