Changing Transfer Case and Axle Fluid???
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New User
Joined: Jan 2009
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Changing Transfer Case and Axle Fluid???
To start off with I know just enough about trucks to be dangerous, but I am pretty handy and can usually fix my mistakes, if made.
My '04 F-350 PSD has 76,000 miles and I figured it was probably past time to change the transfer case and both front and rear axle fluids. I am just wondering how hard it is going to be to do this and if I would be able to do it myself.
If it is worth it to do it by myself or if I have someone do it, I have been hearing really good things about "Royal Purple" synthetic oils and was wondering if I should replace the stock fluid with "Royal Purple". I figure it will probably lower the temperatures and possible maybe even improve mileage some.
Any suggestions?
My '04 F-350 PSD has 76,000 miles and I figured it was probably past time to change the transfer case and both front and rear axle fluids. I am just wondering how hard it is going to be to do this and if I would be able to do it myself.
If it is worth it to do it by myself or if I have someone do it, I have been hearing really good things about "Royal Purple" synthetic oils and was wondering if I should replace the stock fluid with "Royal Purple". I figure it will probably lower the temperatures and possible maybe even improve mileage some.
Any suggestions?
Posting Guru
Joined: Nov 2003
Posts: 1,949
Likes: 0
From: Near DC
Welcome to the forum!
To make it easier for you in the future, go to "User CP" at the top left of every page and enter your truck info in "Signature". This will appear at the bottom of all your posts so you don't have to keep typing it in. One other suggestion, use the regular size font that everyone else uses, it's just easier to read on some of our old eyes.
There are many, many great threads on anything you want to do, use the advanced search and at the bottom right, select your year after putting in some search terms.
In direct answer to your question, it is quite easy, just make sure you have the right tools and follow directions. Check out this link below, it will give you a great start! Oh yeah, take the diff cover off and clean 'er up and paint!
Welcome to guzzle's Ford PSD Web Page
Oh, and consider becoming a Supporter, this site will save you thousands of dollars!
To make it easier for you in the future, go to "User CP" at the top left of every page and enter your truck info in "Signature". This will appear at the bottom of all your posts so you don't have to keep typing it in. One other suggestion, use the regular size font that everyone else uses, it's just easier to read on some of our old eyes.
There are many, many great threads on anything you want to do, use the advanced search and at the bottom right, select your year after putting in some search terms.
In direct answer to your question, it is quite easy, just make sure you have the right tools and follow directions. Check out this link below, it will give you a great start! Oh yeah, take the diff cover off and clean 'er up and paint!
Welcome to guzzle's Ford PSD Web Page
Oh, and consider becoming a Supporter, this site will save you thousands of dollars!
Mountain Pass
Joined: Sep 2007
Posts: 244
Likes: 4
From: Alaska
are required before having access to this feature. So, I'm banned for the time being. 
Look's like I need 4 more Posts. And then...
Postmaster
Joined: Oct 2007
Posts: 4,202
Likes: 1
From: Illinois
Simple task, just make sure you use the the right fluids. Merc V for the transfer case,
75w-90 for the front diff, 90w140 for the rear diff.
75w-90 for the front diff, 90w140 for the rear diff.
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Lead Driver
Joined: Jun 2007
Posts: 6,757
Likes: 5
From: Corvallis, OR
Correct rear fluid is 75w-140 synthetic. Royal Purple is okay, but it is light in viscosity for improved mileage. I would use Mobil 1 fluids or Amsoil Severe Gear.
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Lead Driver
Joined: Aug 2004
Posts: 5,326
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From: Gilbert
Make sure you can open the fill hole on the transfer case before dumping the oil!!!
Whatever oil you go with for the rear, if you have limited slip, make sure the oil contains a friction modifier. If it doesn't, Motorcraft has a small bottle of it available.
Whatever oil you go with for the rear, if you have limited slip, make sure the oil contains a friction modifier. If it doesn't, Motorcraft has a small bottle of it available.
Postmaster
Joined: Oct 2007
Posts: 4,202
Likes: 1
From: Illinois
Doohh!! Sorry that is correct, it was very early this a.m. when I replied
Hotshot
Joined: Mar 2007
Posts: 10,101
Likes: 40
From: Pa
Changing both is easy and starightforward. I used Amosil ATF in the transfer case (2 quarts) and Amsoil Severe Gear in both front and rear diffs on my 04'. I didn't add any friction modifier to the oil, add friction modifier ONLY if you get chatter.(Of course this applies to a clutch type LS only) I upgraded to the 08' finned aluminum rear cover at the same time. For a sealant I recommend getting some Permatex "Right Stuff" it seals with no dripping or leaks like you can get with some sealants. Don't overfill the diffs or you will get seepage at the pinion seal. If you have a transfer case skidplate be prepared for a mess.
Mountain Pass
Joined: Sep 2007
Posts: 244
Likes: 4
From: Alaska
That would have been me. Now I only need three more Posts and I'll make the 25 necessary to enable the "signature" feature.
Laughing Gas
Joined: Mar 2009
Posts: 843
Likes: 6
From: Jessup, PA
I think that the Permatex Right Stuff is the same as the motorcraft sealant available at the dealerships. It is in the the same type of tube for a small caulking gun and cost the same.