Transfer Case & Diff-Maintenance Interval

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Apr 14, 2010 | 05:37 PM

#16

bpounds

Hotshot

Joined: Aug 2006

Posts: 17,400

Likes: 319

From: Whittier, CA

Quote:

Originally Posted by Jayybird

Thanks fellas. I'll be changing the rear/front diffs and transfer case fluids as soon as possible. Also if someone could post a link where I can find fluid type, capacity, and procedure for changing that would be very helpful. I looked in the TECH folder and didn't find many details on this. THANKS for the input. It would've been nice to have found this forum a couple years ago.

You will find that info in the Superduty forum tech folder, because it is not 6.0 diesel related.

https://www.ford-trucks.com/forums/4...lder_____.html

In case you still don't find them -

Transfer case:
Welcome to guzzle's Transfer Case Fluid Change Web Page

Rear diff:
Welcome to guzzle's Rear Differential Maintenance Web Page
and
https://www.ford-trucks.com/forums/8...with-pics.html

Front diff:
Welcome to guzzle's Front Differential Maintenance Web Page

And don't forget your owners manual. It has the capacities and lubricant specs.

Apr 14, 2010 | 05:48 PM

#17

Jayybird

Thread Starter

Tuned

Joined: Jul 2009

Posts: 489

Likes: 4

Quote:

Originally Posted by Jayybird

Alright, I might have answered my own questions. Just checked the manual. It states to use Mercon Motorcraft ATF (2 quarts) for the transfer case. Is this the same stuff we put in our transmission, i know we use Mercon SP?? And for the rear end, it states to use synthetic 75w140 & friction modifier. Is it the same for the front axle?

Apr 14, 2010 | 05:55 PM

#18

bpounds

Hotshot

Joined: Aug 2006

Posts: 17,400

Likes: 319

From: Whittier, CA

Quote:

Originally Posted by Jayybird

It states to use Mercon Motorcraft ATF (2 quarts) for the transfer case. Is this the same stuff we put in our transmission, i know we use Mercon SP??

I would save the SP for just the tranny. You cannot buy Motorcraft Mercon ATF any more, but Mercon V is the approved substitue. Personally, and I just did this last weekend, I used Mobil 1 Synthetic ATF. I like the idea of using the synthetic. I needed a little more than the specified 2 quarts, so I suggest you buy 3. Think I paid ~$6.50/quart.

Quote:

Originally Posted by Jayybird

And for the rear end, it states to use synthetic 75w140 & friction modifier. Is it the same for the front axle?

Not the same as the front. I believe the front is 80W/90. But you will probably find 75W/90 at the store, which will be fine.

You can find 75W/140 with the friction mod already in it, from Mobil, Royal Purple, and others. Your choice, but it does need to be full synthetic.

Jun 16, 2010 | 09:51 PM

#19

Jayybird

Thread Starter

Tuned

Joined: Jul 2009

Posts: 489

Likes: 4

Quote:

Originally Posted by bismic

I changed mine at 50k miles - at least the transfer case and rear differential. I am late on the front axle.

Bismic,
What brand of oil is your preference for the Front & rear diffs? Just curious, thanks for the help. I don't really have a preference as I haven't changed my diff fluid before. Mobile 1 seems to be the most available (autozone, advance autoparts..etc)

Jun 16, 2010 | 10:39 PM

#20

bismic

Fleet Owner

Joined: Nov 2003

Posts: 27,918

Likes: 3,637

My 2006 had a 60k powertrain waranty. I developed a small leak in the rear differential cover seam at 50k. It was changed by the dealership - factory fill fluid.

If I did it myself, I would go with Mobil 1 or Royal Purple.

I haven't looked into the front differential fluids yet.

Jun 16, 2010 | 11:02 PM

#21

Jayybird

Thread Starter

Tuned

Joined: Jul 2009

Posts: 489

Likes: 4

Thanks for the input. Those two seem to be the more popular ones.

Oct 8, 2010 | 01:15 PM

#22

gmc28

Trailering

Joined: Oct 2010

Posts: 24

Likes: 5

From: North Plains, OR

tech folder?

Quote:

Originally Posted by SteveBricks

Jaybird.....take a look at the Super Duty forum's tech folder. All of the questions about fluids and change intervals are answered in there.

pardon the dumb question, but where exactly is the "super duty tech folder"? is that just the list of all the stuff in the super duty tech area, or is there a specific service interval article with details somewhere that i'm not seeing?
thanks

Oct 8, 2010 | 01:54 PM

#23

rickf92592

Elder User

Joined: Jun 2009

Posts: 560

Likes: 3

From: 92592

Quote:

Originally Posted by gmc28

https://www.ford-trucks.com/forums/4...lder_____.html

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Oct 8, 2010 | 03:12 PM

#24

loubell

Mountain Pass

Joined: Sep 2005

Posts: 237

Likes: 6

For one more PM operation, you should also shoot some grease into the zerk fittings on the tie rod ends. And if you're really industrious, take apart your rear driveshaft and grease the splines.