Diff oil change - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-28-2014, 06:32 PM   #1
Jeeper
 
Join Date: Apr 2014
Posts: 24
Diff oil change

I am changing the oil in my diffs this weekend, I have never changed gear oil before and I was told LSDs need a special additive... How would I know if I have an LSD? It is on an 03 sport that I got last month.

PHTanker is offline   Quote Quick Reply
Old 05-28-2014, 06:43 PM   #2
Jeeper
 
Teague242's Avatar
 
Join Date: Apr 2012
Location: Pottsville, Pennsylvania
Posts: 1,572
Quote:
Originally Posted by PHTanker View Post
I am changing the oil in my diffs this weekend, I have never changed gear oil before and I was told LSDs need a special additive... How would I know if I have an LSD? It is on an 03 sport that I got last month.
The LSD is called a trac-lok. I think it'll say something like that on your axle tag. I believe it's the tag with the gear ratio on it.

The additive is due to the fact that it is a clutch based limited slip as opposed to a gear based. It needs the additive in order to function properly.

You can find gear oils with the additive already in it. Find an oil that's designed for them and you won't have a problem. Cheaper oils are what you stay away from.

Teague242 is offline   Quote Quick Reply
Old 05-28-2014, 07:24 PM   #3
Jeeper
 
Join Date: Apr 2014
Posts: 24
Quote:
Originally Posted by Teague242 View Post
The LSD is called a trac-lok. I think it'll say something like that on your axle tag. I believe it's the tag with the gear ratio on it. The additive is due to the fact that it is a clutch based limited slip as opposed to a gear based. It needs the additive in order to function properly. You can find gear oils with the additive already in it. Find an oil that's designed for them and you won't have a problem. Cheaper oils are what you stay away from.
Thx,
I understand the oil and additive, just needed to know how to find out if I had LSD or not....
PHTanker is offline   Quote Quick Reply
Old 05-28-2014, 07:37 PM   #4
Jeeper
 
Join Date: Nov 2011
Posts: 87
My `97 has a decal in the glove box--that is how I found that my TJ is Trac-Loc equipped. I confirmed by plugging my VIN into the Jeep website and the build sheet showed the Trac-Loc on the list. Do a little searching on this forum; there is a bunch of info on the subject. The carrier itself is visibly different as well.
wheeliemay is offline   Quote Quick Reply
Old 05-28-2014, 08:57 PM   #5
Jeeper
 
Join Date: Feb 2014
Posts: 17
Lucas gear oil 80W-90 has the additive already in it.
KJeep03 is offline   Quote Quick Reply
Old 05-29-2014, 09:08 AM   #6
Jeeper
 
Join Date: Nov 2011
Posts: 87
FWIW, I understand most major manufacturers are fully compatible with limited slip diffs--just read the bottle. I know that Royal Purple does not require any additive--although I do not use that product.
wheeliemay is offline   Quote Quick Reply
Old 05-29-2014, 09:12 AM   #7
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,872
Images: 2
Quote:
Originally Posted by KJeep03 View Post
Lucas gear oil 80W-90 has the additive already in it.
99% of the GL-5 gear lubes on the shelves have the friction modifier, it's hard to find one without it.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 05-29-2014, 12:32 PM   #8
Jeeper
 
Join Date: Apr 2014
Posts: 24
I guess I have command-trac, does that mean no LSD? And if not will the oil with the additive hurt it?
PHTanker is offline   Quote Quick Reply
Old 05-30-2014, 08:37 PM   #9
Jeeper
 
Jpjr21's Avatar
 
Join Date: May 2014
Posts: 42
You can also jack up the rear end so both tires are off the ground. Spin one tire and if the tire on the other side spins the same way it has trac-lock. If if goes in the opposite direction, its an open diff and no special additive is needed.
Jpjr21 is offline   Quote Quick Reply
Old 05-30-2014, 09:00 PM   #10
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 31,872
Images: 2
Quote:
Originally Posted by PHTanker View Post
I guess I have command-trac, does that mean no LSD? And if not will the oil with the additive hurt it?
Command-Trac is another name for your part-time transfer case which has nothing to do with your rear axle. The limited slip differential your TJ may or may not have in the rear axle is called a Tracloc.
__________________
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

Jerry Bransford is online now   Quote Quick Reply
Old 06-22-2014, 01:38 PM   #11
Newb
 
jeffreyeye's Avatar
 
Join Date: Jun 2014
Location: Austin, Texas
Posts: 9
Quote:
Originally Posted by wheeliemay View Post
My `97 has a decal in the glove box--that is how I found that my TJ is Trac-Loc equipped. I confirmed by plugging my VIN into the Jeep website and the build sheet showed the Trac-Loc on the list.... .
WOW! Thanks for the reference! I went to the Jeep website and while I couldn't find the place to plug in m VIN and get the build list.... I registered (moparownerconnect.com) and clicked on the online chat option, had someone chatting with me within seconds.... and had a build list within about 4 minutes!!! I'm not sure that I will even consider a non-Jeep/Chrysler vehicle the next time I'm in the market to buy new.



Now, if only changing the gear oil can be so straightforward.....

-Jeff

jeffreyeye is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler 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

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 Off
Pingbacks are Off
Refbacks are Off




» Featured Product

All times are GMT -5. The time now is 07:55 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC