55K MI Rear Diff Fluid Change - Ford Powerstroke Diesel Forum
Powerstroke.org is the premier Diesel Truck Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-03-2011, 10:14 AM
Powerstroke.org Fanatic
 

Join Date: Dec 2010
Location: Overland Park, Kansas
Posts: 104
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
55K MI Rear Diff Fluid Change

Guys:

I bought 4 quarts of Amsoil 75-145 Syn and a tube of limited slip treatment for the rear diff. I got under there today and the cover has never been removed and I thought better of prying it off until I checked the forum.

Question 1: Am I correct that the right way to drain the rear diff is simply to open the rear cover? I didn't think to order a gasket - should I wait until I have one in my possession or do most of these open up without drama?

Question 2: Any suggestions on a better way to fill these diff's other than trying to manhandle a funnel, etc? Given I have 3 AWD/4WD and six axles ahead of me, thought I'd ask those who have been there and done that so to speak.

Question 3: Is there more to this than popping the cover, draining and then filling it?

Thanks in advance.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 04-03-2011, 10:36 AM
Compression Ignition Addict
 

Join Date: Sep 2010
Location: Northern California
Posts: 556
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Quote:
Originally Posted by CaptnKirk View Post
Question 1: Am I correct that the right way to drain the rear diff is simply to open the rear cover?

Yup. To avoid a huge mess, just loosen the top bolts slightly, the side bolts a little more, and the bottom bolts completely. Then just use a flat head to pop the cover.


Quote:
Originally Posted by CaptnKirk View Post
I didn't think to order a gasket - should I wait until I have one in my possession or do most of these open up without drama?

No gasket. You'll gave to get some high temp silicone gasket maker from the auto parts store. Be sure to clean the old silicone gasket junk off both the diff and cover. I use a putty knife or razor blade.


Quote:
Originally Posted by CaptnKirk View Post
Question 2: Any suggestions on a better way to fill these diff's other than trying to manhandle a funnel, etc?

The gear oil bottles are just like a funnel. Just snip the tip, insert, and squeeze away. The fill hole for the rear diff is on top, so it's an easy one. The front diff is on the side, so be prepared for a little drippage.


Quote:
Originally Posted by CaptnKirk View Post
Question 3: Is there more to this than popping the cover, draining and then filling it?

I would definitely use some cleaner for the inside, and wipe out all the oil that collects in the little potholes in the bottom of the diff.
Reply With Quote Quick reply to this message
  #3  
Old 04-03-2011, 10:52 AM
Compression Ignition Addict
 

Join Date: Sep 2010
Location: Beautiful BC
Posts: 534
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
1. Yes pull the cover, let it drain and completely clean off all the old RTV silicone from both surfaces. Make sure both are spotless clean and no oil residue left on them. Some brake cleaner works wonders here.

2. Get some Ultra Gray RTV silicone, lay a 1/4" bead of it around the diff cover staying to the inside of all the bolt holes. Reinstall cover and snug down the bolts. Some say wait for the RTV to set up before filling with oil...this just never happens in a shop environment and I have never had a leak yet just filling it right away.

3. If you want you can buy a fluid transfer pump/suction gun. Comes in handy for filling diffs and transfer cases. Usually around 20 bucks for one at most parts stores.

4. Spray it out good with some brake cleaner and give it a good wipe out and call it a day.
Reply With Quote Quick reply to this message
  #4  
Old 04-03-2011, 11:40 AM
Compression Ignition Addict
 

Join Date: Nov 2008
Location: California
Posts: 4,259
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
Nice! I also have amsoil in my diffs and transfercase. love it!

I used a funnel and a hose to fill the diff. I also had the truck at an angle on a hill so that the fill hole was higher than the diff, = more fluid in the diff.

I did not use the LS fluid, the gear oil has enough. I have been using amsoil in my drive train since my truck was at 30,000 miles.
Reply With Quote Quick reply to this message
  #5  
Old 04-03-2011, 07:30 PM
Compression Ignition Addict
 

Join Date: Jul 2010
Location: Cincinnati
Posts: 3,915
Thanks: 5
Thanked 21 Times in 20 Posts
Feedback Score: 12 reviews
I'm thinking I need to do this. I'm at 60k. What's the best fluid to use and how much for front and rear diff
Reply With Quote Quick reply to this message
  #6  
Old 04-03-2011, 08:13 PM
Compression Ignition Addict
 

Join Date: Sep 2010
Location: Northern California
Posts: 556
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
This is what I used:

Rear: Mobil-1 75w140
Front: Mobil-1 80w90
Reply With Quote Quick reply to this message
  #7  
Old 04-04-2011, 07:00 PM
Compression Ignition Addict
 

Join Date: Jul 2009
Location: Marysville, WA
Posts: 291
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Above suggestions are all right-on, one more I would add: Before you go opening up the diff, take out the fill plug to make sure it's not seized or stripped or anything.

Adam
Reply With Quote Quick reply to this message
  #8  
Old 04-04-2011, 09:00 PM
Compression Ignition Addict
 

Join Date: Nov 2008
Location: California
Posts: 4,259
Thanks: 0
Thanked 1 Time in 1 Post
Feedback Score: 0 reviews
I thought about using mobil but I wanted the cold viscosity "75" 75w-90 and there was none around when I did the work.
Reply With Quote Quick reply to this message
  #9  
Old 04-05-2011, 09:05 AM
Powerstroke.org Fanatic
 

Join Date: Dec 2010
Location: Overland Park, Kansas
Posts: 104
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
Thank you all for the great feedback and support. I love forums!

Did the work, it was a non-event. I am an avid Mobil 1 user, but the Amsoil was easy to order online and it was actually cheaper than the Mibil 1 - go figure. I recall Amsoil always being more expensive.

Again thanks all for the support.
Reply With Quote Quick reply to this message
  #10  
Old 04-05-2011, 12:56 PM
Compression Ignition Addict
 

Join Date: Dec 2009
Posts: 914
Thanks: 0
Thanked 0 Times in 0 Posts
Feedback Score: 0 reviews
So next month I want to do the same service. I was planning on using the Severe Gear 75W-140 Product Code: SVOQT-EA front and rear. Is 8 oz of this Slip Lock Differential Additive Product Code: ADATB-EA really necessary?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Ford Powerstroke Diesel Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -8. The time now is 01:15 PM.


Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.6.1
Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

vB.Sponsors