Correct TJ Rubicon differential fluid(s). - JeepForum.com
 4Likes
  • 1 Post By 2jhanna
  • 2 Post By Jerry Bransford
  • 1 Post By joe_jeep
 
LinkBack Thread Tools
post #1 of 10 Old 08-04-2020, 07:31 AM Thread Starter
Ijeepalone
Registered User
2005 TJ Wrangler 
 
Join Date: Nov 2017
Location: Lake Harmony
Posts: 6
Correct TJ Rubicon differential fluid(s).

Prepping for my first DIY differential(s) fluid change on a stock '06 Rubicon, some confusion on the correct fluid to use. Just watched deepdivejeepHD (YouTube) which was great. For the rear Dana 44 axle > Mopar Synthetic Gear & Axle Lub / SAE 75W140 / GL-5, which matches the metal tag on the diff. Deepdive is very thorough and I assume he would mention if the front Dana 44 diff required a different lub...he did not. The metal tag on the front diff sez 80W90.

Deepdive also mentioned that '02-06 Rubicon axles were incorrectly tagged, so a little confused & need some guidance. Last, he also mentioned to NOT add friction modifier...because the Rubicon axles with the lockers do not require this, unlike previous Dana 44's.

If 80W90 is correct for the front axle...just curious, why? Also, any rec's on a good maintenance manual (pdf preferred) that includes the TJ Rubicon thoroughly (not just the base models)?

Thanks in advance!

Ijeepalone is offline  
Sponsored Links
Advertisement
 
post #2 of 10 Old 08-04-2020, 08:09 AM
2jhanna
Web Wheeler
2002 TJ Wrangler 
 
Join Date: Jun 2007
Location: Denton County, TX
Posts: 9,658
Look here

https://www.jeepforum.com/forum/f9/f...cities-489932/
Wheelin98TJ likes this.

I am multi-talented, I can talk and piss you off at the same time.

jhanna
denton county, tx
2jhanna is offline  
post #3 of 10 Old 08-04-2020, 10:13 AM
Wheelin98TJ
JEEP FREAK
 
Wheelin98TJ's Avatar
1998 TJ Wrangler 
 
Join Date: Apr 2004
Posts: 26,715
You want the Factory Service Manual (aka FSM).
Wheelin98TJ is offline  
 
post #4 of 10 Old 08-04-2020, 01:15 PM
jkp
Registered User
2006 TJ Wrangler 
 
Join Date: Sep 2008
Location: Warner Robins, GA
Posts: 813
Owners manual at Jeep.com is a free download.

Yes, front specs 80W-90, I just put 75W-140 in both for simplicity.

'92 Islander
'06 Rubicon
jkp is offline  
post #5 of 10 Old 08-05-2020, 06:07 PM
JeepingNet
Registered User
2005 LJ Wrangler 
 
Join Date: Jul 2002
Location: New Brunswick, Canada
Posts: 482
I think you'll find a lot of people use 85W-140

Colin Jennings
Trail - 2005 Jeep LJ Rubicon
Daily - 2007 Jeep Grand Cherokee Limited 5.7L
JeepingNet is offline  
post #6 of 10 Old 08-05-2020, 07:07 PM Thread Starter
Ijeepalone
Registered User
2005 TJ Wrangler 
 
Join Date: Nov 2017
Location: Lake Harmony
Posts: 6
Very good, thanks gents. When I picked up the Mopar diff fluid today (75W140 for both pumpkins), the dealer parts dude also brought out some friction modifier. I told him of multiple sources that said it was not required. Thoughts?
Ijeepalone is offline  
post #7 of 10 Old 08-05-2020, 08:26 PM
2jhanna
Web Wheeler
2002 TJ Wrangler 
 
Join Date: Jun 2007
Location: Denton County, TX
Posts: 9,658
Most "top shelf" gl5 gear lubes today have the friction modifier already built in. Even if not needed, it doesn't hurt, but good you didn't pay extra for it, on top of the probably high price for the dealer fluid.

I am multi-talented, I can talk and piss you off at the same time.

jhanna
denton county, tx
2jhanna is offline  
post #8 of 10 Old 08-05-2020, 09:51 PM
Jerry Bransford
Administrator
 
Jerry Bransford's Avatar
2004 TJ Wrangler 
 
Join Date: Jan 2003
Location: Escondido, California
Posts: 72,001
Neither the Rubicon lockers nor its rear limited slip differential needs the friction modifier. It's of no use in the Rubi axles.

Surprising to some is if you run a standard conventional (non-synthetic) GL-5 gear lube your gears will run significantly cooler than if with a synthetic gear. True. Many axle builder companies like Currie and Dyan require conventional GL-5 gear lubes to keep their warranties in effect due synthetic gear lubes making the gears run hotter.

Revolution Gear specifies a conventional gear lube during the break-in process.

This from https://www.revolutiongear.com/ring_...reak_procedure

"Recommended gear oil is an 80W-90 or 85W-140, Non-Synthetic, GL5 grade or Higher, Name Brand Oil.
JeepingNet and Ironhead like this.

When you have a choice, buy American made.
Jerry Bransford is offline  
post #9 of 10 Old 08-06-2020, 04:55 AM Thread Starter
Ijeepalone
Registered User
2005 TJ Wrangler 
 
Join Date: Nov 2017
Location: Lake Harmony
Posts: 6
Awesome, thank you all!
Ijeepalone is offline  
post #10 of 10 Old 08-07-2020, 07:26 PM
joe_jeep
Registered User
2005 LJ Wrangler 
 
Join Date: Mar 2006
Location: hazel park, mi
Posts: 6,524
Garage
i have been running 85w140 conventional since the re-gear.
no problems. changed twice pretty quickly after the re-gear.
Jerry Bransford likes this.

glfwda #6624
2005 rubicon sahara lj #592
joe_jeep is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



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 On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome