Diff fluid change w/ Royal Purple. Add extra friction modifier?

hawgdoctor · Jan 21, 2012

Have used amsoil for years, and am a dealer if you need anyhting. Stay away from th RP. I can tell you from personal experience it won't hold up ,and you'll be rebuilding the rear end. Mobil one, and the valvoline are also good fluids if you don't wanna try to get the amsoil. Have used those alot also with very good results, and easier to get from the local parts houses.

Mwilbur516 · Jan 21, 2012

Hawgdoctor, how much would the Amsoil run? The Amsoil dealer I talked to was a douche.

hawgdoctor · Jan 21, 2012

For the rear it's $15 a quart, and you'd need four for the rear end. If you are going to do the front to you will need an additional three, and that is about $13 a quart if I remember correctly. You'll see two different prices because it will take two different weight oils.
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Lubbockguy1979 · Jan 25, 2012

Ok with the modifier if your not getting the rear to lock up. Adding more modifier should help right?
My 04 was a pita to drive in the wet and would slide the rear around spinning both rears. The 06 dosent do this very easily at all.

Mdub707 · Jan 27, 2012

No, adding more probably won't help. It reduces friction to allow it to slip, so adding more will make it slip more is my understanding. I know on my rangers they always took less than the bottle recommended.

Mwilbur516 · Jan 27, 2012

So if I'm understanding this correctly, you should only add the friction modifier if the LS is trying to stay lock all the time and causing chatter/popping in turns/general noise that it shouldn't? Then only add a little at a time?

lincolnlocker · Jan 28, 2012

Mwilbur516 said:
So if I'm understanding this correctly, you should only add the friction modifier if the LS is trying to stay lock all the time and causing chatter/popping in turns/general noise that it shouldn't? Then only add a little at a time?

Yes!

Zmann · Jan 29, 2012

agreed that is how the modifier works it lessens the fricton

strokr06 · Feb 5, 2012

I changed my rear end fluid 25k ago with RP, no friction additive and no issues at all. This truck has a 9500lb load attached to it 90% of the time and stays cool.

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