change diff gear oil? - Ford Powerstroke Diesel Forum
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post #1 of 20 Old 05-31-2014, 07:21 PM Thread Starter
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change diff gear oil?

I am coming up on 100K and I was looking for input on changing the diff gear oil front and rear. The manual states it is a lifetime gear oil and only change if it has been submerged. I am the second owner and I have no idea if it has been serviced. The front fluid looks and smells good the rear is black and smells.

The truck is a 2011 F350 crew cab, SRW.

If yes what do you recommended??? Ford, Luca, Royal Purple, additive Y/N etc.

thanks
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post #2 of 20 Old 05-31-2014, 07:32 PM
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front doesn't get much use i wouldn't go out of my way for it unless i was doing something in the area
the rear does get a lot of use LOL and it smells
i thought they all smelled LOL

do you have a limited slip or e locker or ??

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post #3 of 20 Old 06-01-2014, 02:47 AM Thread Starter
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Originally Posted by ZMANN View Post
front doesn't get much use i wouldn't go out of my way for it unless i was doing something in the area
the rear does get a lot of use LOL and it smells
i thought they all smelled LOL

do you have a limited slip or e locker or ??
Great question on the limited slip or e locker. I have only had the truck for less than 3K and do not have the window sticker. I will have to look at the rear and see if their are any #s I can pull and cross reference to find out more info.
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post #4 of 20 Old 06-03-2014, 05:12 PM
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I used AMSOIL in my front and rear and have had no problems. I didnt add the Ford additive either.

2012 F-250 6.7L 4x4 Lariat CCSB, Titan 51gal, BDS 4" kit with Fox Shox, Toyo AT II 35/12.50R20, Ranch Hands front and rear

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post #5 of 20 Old 06-07-2014, 08:14 AM
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Quote:
Originally Posted by wfo_180 View Post
Great question on the limited slip or e locker. I have only had the truck for less than 3K and do not have the window sticker. I will have to look at the rear and see if their are any #s I can pull and cross reference to find out more info.
if your 4x4 selector pulls out and you get the lock light you have the e locker. simple no sticker needed.

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post #6 of 20 Old 06-07-2014, 09:06 AM Thread Starter
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Originally Posted by 2013F250Tank View Post
if your 4x4 selector pulls out and you get the lock light you have the e locker. simple no sticker needed.
Thank you

It does lock in and also states advance track on/off
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post #7 of 20 Old 06-15-2014, 11:25 AM
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Go here and click the Vehicle tab and enter VIN to get the build sheet info

https://www.etis.ford.com

add your VIN to the end of this link to view the window sticker....cut and past the link below into the address of your web browser so you can add the VIN after the =

services.forddirect.fordvehicles.com/inventory/WindowSticker.pdf?vin=
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post #8 of 20 Old 06-15-2014, 05:00 PM Thread Starter
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Originally Posted by Larry1013 View Post
Go here and click the Vehicle tab and enter VIN to get the build sheet info

https://www.etis.ford.com

add your VIN to the end of this link to view the window sticker....cut and past the link below into the address of your web browser so you can add the VIN after the =

services.forddirect.fordvehicles.com/inventory/WindowSticker.pdf?vin=
Those are some great sites thank you very much.

Looks like 3.55 rear with electronic locking axle.

Looking at replacing with Lucas Synthetic 75W-140 Gear Oil or their Heavy Duty 85W-140 Gear Oil. Has anyone ran these in their 6.7s and did you add the Ford additive?

2011 F350, 4x4, Crew Cab, Lariat, 6.7, SRW, Stage 4 ready lift, air bags
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post #9 of 20 Old 06-15-2014, 05:30 PM
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Not sure you need an additive with the electronic locking rear. The additives were used with the limited slip that used clutch plates and steels.

Per 2011 F350 Owner's Manual

http://www.fordservicecontent.com/Fo.../11f23og4e.pdf

Page 410

Add 8 oz. (236 ml) of Additive Friction Modifier XL-3 or equivalent meeting Ford Specification EST-M2C118–A for complete refill of limited slip Ford axles. Ford design rear axles contain a synthetic lubricant that does not require changing unless the axle has been submerged in water
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post #10 of 20 Old 06-15-2014, 06:35 PM
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I went to the etis website and put in my Vin and it says without E-locker but my truck has it. Weird

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