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Old 10-06-2007, 20:41   #1 (permalink)
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Whicj rear end fluid?

I have a 2003 5.4l Eddie Bauer Expedition. The car does NOT have the limited slip rear end. I was looking in the manual and it says to use 75w-90, but below that it says 75w-140. Which should I use and which weight oil is in there now?

I located the fill plug and drain plug. Do I need to remove the cover or can I just drain the fluid and re-fill it without pulling the cover off?

Thanks again.
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Old 10-07-2007, 14:40   #2 (permalink)
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Re: Whicj rear end fluid?

Looks like I found the answer to my question.

NOTE WHEN SERVICING THE REAR AXLE ON ANY 2002-2004 F-150, EXPEDITION, NAVIGATOR, EXPLORER OR MOUNTAINEER BUILT BEFORE 3/30/2004, IF FLUID REPLACEMENT IS REQUIRED, REPLACE THE ORIGINAL FUEL EFFICIENT HIGH PERFORMANCE (FEHP) SAE 75W-90 REAR AXLE LUBRICANT WITH SAE 75W-140 HIGH PERFORMANCE SYNTHETIC REAR AXLE LUBRICANT. WHEN THE FLUID TYPE IS CHANGED, REPLACE THE CURRENT "FEHP" METAL TAG WITH A NEW "75W-140" TAG (F3TZ-4121-AA). IN ADDITION, REMOVE OR BLOCK-OUT THE FEHP REFERENCE ON THE MULTI-COLORED LABEL LOCATED ON THE RIGHT SIDE AXLE TUBE. IF THE AXLE IS A LIMITED-SLIP MODEL, USE XL3 ADDITIVE FRICTION MODIFIER IN THE QUANTITY RECOMMENDED BY THE WORKSHOP MANUAL.
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Old 11-12-2007, 17:26   #3 (permalink)
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Re: Whicj rear end fluid?

If you tow, use full synthetic 75W90. Some synthetic oils come with anti-slip additive in them already, even if you don't have the limited slip diff it won't hurt it none. If the cover has a bottom and a side hole you shouldn't have to remove the cover. I'd remove the cover every second oil change just to clean the magnet and to inspect the gears.
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Old 11-12-2007, 18:21   #4 (permalink)
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Re: Whicj rear end fluid?

Quote:
Originally Posted by 360ci
If you tow, use full synthetic 75W90. Some synthetic oils come with anti-slip additive in them already, even if you don't have the limited slip diff it won't hurt it none. If the cover has a bottom and a side hole you shouldn't have to remove the cover. I'd remove the cover every second oil change just to clean the magnet and to inspect the gears.
I ended up putting in 75w-140 Royal Purple 100% synthetic. I hope this is ok.
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Old 11-12-2007, 19:43   #5 (permalink)
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Re: Whicj rear end fluid?

Keith - 75w140 will work if the manual requests it. Rear end problems aren't generally caused by using the wrong weight gear oil. I know in Dodge differentials, the small clips were prone to come off around 90-100K. It has more do with how hard you run the truck. If you drive mostly with no load, cargo, passengers or trailer, then you'll have no problems. Synthetic will help dissipate heat better and allows for extended drain intervals over petroleum based gear oil stocks. If you carry heavy loads or tow above 60mph I'd definitely use the 75W90. If you occasionally tow and carry heavy loads 75W140 is sufficient. I own two trailers and my Dodge pulls them every weekend and some evenings during the week (side jobs!). I haven't had any problems yet - knock on wood, but Amsoil HD 75W90 is all I use. My truck hardly ever exceeds 65mph even when I'm not towing.
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