Did I do the right thing.
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Senior User
Joined: Feb 2011
Posts: 421
Likes: 2
From: FT. Rucker AL
Did I do the right thing.
I just replaced the rear diff with royal purple fluid. I hope it was a good thing, has anyone else used royal purple in there rear end then regular ford gear oil in there rear ends.
Post Fiend
Joined: Mar 2009
Posts: 11,798
Likes: 14
From: Mt. Shasta California
Ford uses synthetic and using regular oil won't hurt it and another brand won't hurt it either. The main thing is to get the weight right.
MMNC (SS)(Ret)
Joined: Mar 2004
Posts: 11,606
Likes: 149
From: SE Georgia
does your truck have a limited slip?
does the Royal purple contain a friction modifier
if you have a LS, you will need a lubricant that contains friction modifier so the LS will work properly.
does the Royal purple contain a friction modifier
if you have a LS, you will need a lubricant that contains friction modifier so the LS will work properly.
9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
I am not a fan of RP at all. They make respectable ATF and thats about it. Specifically regarding RP gear oil in the Sterling 10.5, I have seen an oil analysis that showed extremely premature breakdown after only about 10,000 miles.
If you'd like I can try to find the analysis.
If you'd like I can try to find the analysis.
Senior User
Joined: May 2010
Posts: 471
Likes: 1
From: Pocatello, Idaho
Last fall my rear diff cover was leaking, and the only fluid I could find in town was the Royal Purpal. So that is what I used. It does have the friction modifier in it for LS. But now my rear pinion seal is starting to leak but I can't say RP has anything to do with that. I'll probably have Ford change out the seals later this year so it won't be in there that long.
A/Ox4 I would be interested in any info you have on the RP. Thanks.
A/Ox4 I would be interested in any info you have on the RP. Thanks.
Super Moderator
Joined: Aug 2003
Posts: 25,479
Likes: 742
From: Isanti, MN
These axles are designed to use 75w140 gear oil, which is something that isn't available in a non-synthetic oil. The choice is which synthetic oil to use, not whether or not to use synthetic.
Even the Wal-Mart brand is full synthetic!
Even the Wal-Mart brand is full synthetic!
Tuned
Joined: Jun 2012
Posts: 293
Likes: 25
From: Central Illinois
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Super Moderator
Joined: Oct 2005
Posts: 24,308
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From: SW Virginia
No wonder your worried about threads...
some people mind thier own business or just accept an accident might happen.
But others need to speak needlessly about nothing of their concern.
Some push the cart, some pull, others ride, and some complain because they didn't even make an effort.
God Bless
some people mind thier own business or just accept an accident might happen.
But others need to speak needlessly about nothing of their concern.
Some push the cart, some pull, others ride, and some complain because they didn't even make an effort.
God Bless
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Post Fiend
Joined: Mar 2009
Posts: 11,798
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From: Mt. Shasta California
Some don't, read the label or look at their site. Some come both ways with same brand.
Logistics Pro
Joined: Jul 2004
Posts: 4,859
Likes: 55
From: Middleville, MI
mobil 1. used it in my last SD that had LS, on which the clutches were worn and the LS wasn't working well.. so i experimented a little with the additive; i only added half the reccomended amount and still didn't have any chatter so i just ran it that way for the few years until i traded it on, problem-free. so if your LS is lame try it with no modifier then add until the chatter goes away. wish i would have started with little or none.
Thread Starter
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Senior User
Joined: Feb 2011
Posts: 421
Likes: 2
From: FT. Rucker AL
Well to be honest I dont know if it need the friction modifier in it or not. When I asked the mechanic what I need he looked it up and told me who much and what weight. Now I am not 100% sure if I have an LS rear end or not. I know if I do a burn out on the dirt it will leave two tire marks is that a good indicator. Also I have put on about 1500 miles and I dont hear any chatter.
Cargo Master
Joined: Oct 2011
Posts: 2,958
Likes: 4
From: Denver, NC
Well to be honest I dont know if it need the friction modifier in it or not. When I asked the mechanic what I need he looked it up and told me who much and what weight. Now I am not 100% sure if I have an LS rear end or not. I know if I do a burn out on the dirt it will leave two tire marks is that a good indicator. Also I have put on about 1500 miles and I dont hear any chatter.
Does it say "off road" or "FX4" on the rear quarter panel under 4x4