How much does it need, what weight to use, and does royal purple Maxgear already have the additive in it?

 

um when i change mine, i was taught at the lube to drain from the bottom 'drain" hole, plug it then fill the "fill hole"with fluid until it pours out of the fill hole and levels off, stick your pinky in to make sure the fluid it at the top then plugit up, start your car and just run through the gears, that is for the manuel tranny new edge mustangs.the automaticsi dont know about

 

I am not talking about the transmission. i am talking about the rear end. It has an 8.8, a manual or automatic transmission is completely and utterly irrelevant.

 

2 quarts and 2 bottles of friction modifier should fill it up, if not you'll need some of a third quart

 

just wondering how much I should buy