Differential fluid
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Senior User
Joined: Jul 2004
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From: st.petersburg, fl
Differential fluid
Does anybody know which brand of fluid Ford used in the sterling and Dana differentials? I am getting ready to change mine at 174,000 miles. I know they say lifetime but I would like to change them out.
Lead Driver
Joined: Feb 2000
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From: Palm Bay, Florida
-Don't know the brand that Ford used originally.
-I would just use a quality full snythetic in whatever weight your axle requires, and may be a 4oz bottle of FORD friction modifier as well.
-I would just use a quality full snythetic in whatever weight your axle requires, and may be a 4oz bottle of FORD friction modifier as well.
Laughing Gas
Joined: Nov 2010
Posts: 1,193
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From: D.C. but heart's in TEXAS
I changed the rear differential fluid on HERS years ago with AMSOIL, and when I was driving home, I thought something was wrong. Then I realized that for the first time since I had owned the truck, the limited slip rear was ACTUALLY WORKING. So I recommend getting the Amsoil rear differential fluid, and you DO need to put in a friction modifier as already stated.
In addition, I HIGHLY recommend using this stuff to seal your rear differential cover rather than "normal" RTV:
Gasket Makers : Permatex® the Right Stuff® Gasket Maker
It's about $20 for a can, but let me tell you, I've used it for so many other things it's ridiculous (one can lasts a long time). Need to make a custom gasket? It will do it. I love this stuff.
In addition, I HIGHLY recommend using this stuff to seal your rear differential cover rather than "normal" RTV:
Gasket Makers : Permatex® the Right Stuff® Gasket Maker
It's about $20 for a can, but let me tell you, I've used it for so many other things it's ridiculous (one can lasts a long time). Need to make a custom gasket? It will do it. I love this stuff.
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Joined: Dec 2012
Posts: 750
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From: Oakdale, CA
I changed the rear differential fluid on HERS years ago with AMSOIL, and when I was driving home, I thought something was wrong. Then I realized that for the first time since I had owned the truck, the limited slip rear was ACTUALLY WORKING. So I recommend getting the Amsoil rear differential fluid, and you DO need to put in a friction modifier as already stated.
In addition, I HIGHLY recommend using this stuff to seal your rear differential cover rather than "normal" RTV:
Gasket Makers : Permatex® the Right Stuff® Gasket Maker
It's about $20 for a can, but let me tell you, I've used it for so many other things it's ridiculous (one can lasts a long time). Need to make a custom gasket? It will do it. I love this stuff.
In addition, I HIGHLY recommend using this stuff to seal your rear differential cover rather than "normal" RTV:
Gasket Makers : Permatex® the Right Stuff® Gasket Maker
It's about $20 for a can, but let me tell you, I've used it for so many other things it's ridiculous (one can lasts a long time). Need to make a custom gasket? It will do it. I love this stuff.
To the OP... Just use any full synthetic 75W-140 and the friction modifier if LS.
Laughing Gas
Joined: Nov 2010
Posts: 1,193
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From: D.C. but heart's in TEXAS
I will agree with both Supercab and Justin. ANY SYNTHETIC will do great, it doesn't have to be the brand I suggested (I don't sell it...just have used it over the years). Mobil 1, Castrol may make a full synth, Royal Purple, Amsoil, Schaeffers, Redline, etc. Does Lucas have a synth? Heck, Wally-World may have the Mobil 1 synth so I'd get whatever is most readily available.
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