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Old 05-18-2010, 09:48 PM   #1
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Default Rear Differential Fluid???

I have an '01 f-150 2wd with the triton 4.6. What kind and of rear diff fluid should I use? Do I need to use an additive? I'm going to replace the cover seal and clean all the old fluid out and put some new stuff in but didn't know what to put in. I know this is a newb question that yall probably get tired of hearing but any advice would be greatly appreciated. Thanks. Also, if there are any other advice on this project would be great.
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Old 05-19-2010, 08:30 PM   #2
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Default No problem:

75W140 full synthetic only. A limited-slip differential requires a friction modifier added to the lube.

Here is the Ford spec. for lube for a '97 standard axle, yours should be the same:

Synthetic 75W-140 GL-5
Note: Part No. XY-75W140-QL

For a limited-slip axle:

Synthetic 75W-140 GL-5+
Note: Part No. XY-75W140-QL
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Old 05-19-2010, 09:22 PM   #3
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Thanks Kattumaram. How do I know if my diff is a limited slip? What kind of additive does it take if it is? I really appreciate your reply btw.
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Old 05-19-2010, 10:42 PM   #4
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look at the tag on the rearend . it will be 3l55 that means 355 gear and the l means limited slip. you can get synthetic 75w140 and get xl3 additive at the dealership also.
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Old 05-20-2010, 09:22 AM   #5
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Ok, I checked out the tag and it does say 3L55 and through further research I found out that the axle code H9 on my door jam means that I have a 3.55 LS Diff. Problem solved. Thanks Guys.
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Old 05-21-2010, 07:59 AM   #6
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Correct me if I'm wrong, but a synthetic like Royal Purple does not need the friction modifier, because RP already has this stuff in it.
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Old 05-21-2010, 09:29 AM   #7
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Quote:
Originally Posted by FX4Nick View Post
Correct me if I'm wrong, but a synthetic like Royal Purple does not need the friction modifier, because RP already has this stuff in it.
I've read that too but i figured I'd put it in anyway. Couldn't hurt....
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Old 05-21-2010, 12:43 PM   #8
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You're wasting your money when using the premium synthetics. They have the friction modifiers in them already. I use Amsoil brand in mine.
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4.88 gears, trans shift kit, 4 link/triple adj coilovers are installed
Hawk/Performance Friction pads w/EBC rotors and stainless steel hoses. LiveWireIS tuned by myself w/SCT Pro Racer Package. and now for my next trick...twin turbos piece by piece.
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Old 05-21-2010, 02:49 PM   #9
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I went to the dealership to get the fluid and gasket, they said ford does not offer a gasket for the rear diff. what gives? I found one at o'reilly's but the FORD DEALERSHIP doesn't carry one?
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Old 05-21-2010, 03:25 PM   #10
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The factory uses silicone as a gasket. The place that did my rear end used it to and it works fine.
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Old 05-21-2010, 03:25 PM
 
 
 
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