Going to Change my Differential fluids soon, What weight gear oil? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Liberty Forums > KK Liberty Forum > Going to Change my Differential fluids soon, What weight gear oil?

FS: Wranger BRIGHT License Plate LED! Just $3! Great valueBlack Friday SALE! Up to 20% off at Diode Dynamics!Metalcloak's Black Friday & Small Business Saturday Sa

Reply
Unread 03-04-2014, 09:35 PM   #1
bigx5murf
Registered User
 
Join Date: Feb 2014
Location: Las Vegas, NV
Posts: 7
Going to Change my Differential fluids soon, What weight gear oil?

I no longer have my manual, so I'm going to have to rely on this...

http://en.wikibooks.org/wiki/Jeep_Li..._%26_Intervals

For front and rear differential, I see it lists 75w90 for street use, and 75w140 for towing or off roading. I'm assuming the need for the higher weight oil is the increased heat generated from towing/off roading.

That being said, I don't plan on off roading more than once or twice a month (desert shooting areas). But I'm still leaning towards the higher weight, because my summers could include 2 months of 110F-120F. I assume I'm going to lose a bit of mpgs with the higher weight oil.

If the wiki's blatantly wrong on weights, please let me know. If anyone thinks going with the higher weight lube is the wrong choice, please let me know why.

I also plan on changing coolant soon, the stuff in there I'm assuming is the factory fill, it's a red/orange color. Does that mean it's GM Dexcool? If so, I'm assuming I'll have to flush it with distilled multiple times till it drain clear before I can fill it with green coolant? Also, in my other car I go 30/70 on coolant/water, for better cooling in these hellish summers. Is there any reason I shouldn't do so on my KK liberty?

bigx5murf is offline   Reply With Quote Quick reply to this message
Unread 03-04-2014, 10:13 PM   #2
tjkj2002
Registered User
2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,146
In your neck of the woods I'd run 85w-140 in the rear and regular 80w-90 in the front.You won't loose enough to worry about in the heat of NV.

Skip the synthetic gear oil,your diffs will last longer.
__________________
'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
tjkj2002 is offline   Reply With Quote Quick reply to this message
Unread 03-05-2014, 11:35 AM   #3
cougargnw
Registered User
2011 KK Liberty 
 
Join Date: Mar 2014
Location: , michigan
Posts: 5
Quote:
Originally Posted by tjkj2002 View Post
In your neck of the woods I'd run 85w-140 in the rear and regular 80w-90 in the front.You won't loose enough to worry about in the heat of NV.

Skip the synthetic gear oil,your diffs will last longer.
Im curious why you say to skip the synthetic oils for the diffs
cougargnw is offline   Reply With Quote Quick reply to this message
Unread 03-05-2014, 12:10 PM   #4
lfhoward
Registered User
2008 KK Liberty 
 
Join Date: Nov 2012
Location: Ann Arbor, MI
Posts: 545
You should be able to download your owners manual on the Jeep website. http://www.jeep.com/en/owners/manuals/
__________________
2008 Liberty Sport 4x4 Automatic
lfhoward is offline   Reply With Quote Quick reply to this message
Unread 03-05-2014, 12:45 PM   #5
bigx5murf
Registered User
 
Join Date: Feb 2014
Location: Las Vegas, NV
Posts: 7
Quote:
Originally Posted by tjkj2002 View Post
In your neck of the woods I'd run 85w-140 in the rear and regular 80w-90 in the front.You won't loose enough to worry about in the heat of NV.

Skip the synthetic gear oil,your diffs will last longer.
What I'm worried about is that the rest of the year is actually quite temperate, like 50F-70F, its just during May-July, that it's hell on earth. So, does it make sense to lube up for the extreme heat?

I do like the idea of going with the higher weight just in the rear though. I may do that.

Also, why do you say not to go with synthetic lube? I get amsoil at near wholesale prices so, I was going to go with that.
bigx5murf is offline   Reply With Quote Quick reply to this message
Unread 03-05-2014, 02:18 PM   #6
AtTheHelm
Registered User
 
Join Date: Nov 2012
Location: South Lake Tahoe, CA
Posts: 774
With you're coolant don't use regular green antifreeze. You need to use the spec coolant, which is Mopar Hoat. There is a replacement for it, I beleive it is Zerex G05, but don't quote me on that.
AtTheHelm is offline   Reply With Quote Quick reply to this message
Unread 03-05-2014, 04:11 PM   #7
tommudd
Registered User
2004 KJ Liberty 
 
Join Date: Aug 2008
Location: Central OH/ Moshi Tanzania, Ohio/Tanzania
Posts: 4,430
Quote:
Originally Posted by bigx5murf View Post
What I'm worried about is that the rest of the year is actually quite temperate, like 50F-70F, its just during May-July, that it's hell on earth. So, does it make sense to lube up for the extreme heat?

I do like the idea of going with the higher weight just in the rear though. I may do that.

Also, why do you say not to go with synthetic lube? I get amsoil at near wholesale prices so, I was going to go with that.
Regular old dino gear lube hangs on the gears longer and better than any of the synthetic stuff .
Save your money and protect your diffs
__________________
04 Liberty, Kilimanjaro Edition, Rock Lizard RockRails/Roof Rack/Front-Rear bumper,32 inch Goodyear Duratracs,Moabs,4.10s/ 4.25 inch JBA Coilover lift /other goodies
tommudd is online now   Reply With Quote Quick reply to this message
Unread 03-06-2014, 12:08 AM   #8
tjkj2002
Registered User
2002 KJ Liberty 
 
Join Date: Dec 2009
Location: Colorado
Posts: 8,146
Quote:
Originally Posted by bigx5murf View Post
What I'm worried about is that the rest of the year is actually quite temperate, like 50F-70F, its just during May-July, that it's hell on earth. So, does it make sense to lube up for the extreme heat?

I do like the idea of going with the higher weight just in the rear though. I may do that.

Also, why do you say not to go with synthetic lube? I get amsoil at near wholesale prices so, I was going to go with that.
Quote:
Originally Posted by tommudd View Post
Regular old dino gear lube hangs on the gears longer and better than any of the synthetic stuff .
Save your money and protect your diffs
X2...................

Oh and I run 85w-140 in both diffs year round and it get's much,much colder here in CO with zero issues.
__________________
'02 Liberty sitting on 35" tires,HP44,RockJock60,and AtlasII t-case
tjkj2002 is offline   Reply With Quote Quick reply to this message
Unread 03-06-2014, 12:26 AM   #9
Skipper6413
Registered User
2011 KK Liberty 
 
Join Date: Jul 2011
Location: Texarkana, Texas
Posts: 337
Aaaand don't forget the friction modifier...its required in limited slip diffs.
Skipper6413 is offline   Reply With Quote Quick reply to this message
Unread 03-06-2014, 01:13 AM   #10
Bmxer524
Registered User
2011 KK Liberty 
 
Join Date: Aug 2011
Location: Lindenhurst, NY
Posts: 1,195
We don't have factory limited slips. Open diffs front and rear on all KKs.
__________________
2011 Deep Cherry Red KK - Skyslider - OME 927/731 - Bilstein Shocks - 1/4" Spacer Plate - 3/8" Clevis - Al's A-arms - 245/75-16 Duratracs
Bmxer524 is offline   Reply With Quote Quick reply to this message
Unread 03-09-2014, 04:53 AM   #11
bigx5murf
Registered User
 
Join Date: Feb 2014
Location: Las Vegas, NV
Posts: 7
Quote:
Originally Posted by Bmxer524 View Post
We don't have factory limited slips. Open diffs front and rear on all KKs.
Guess that explains the tire squeals during tight turns
bigx5murf is offline   Reply With Quote Quick reply to this message
Unread 03-09-2014, 05:02 AM   #12
tommudd
Registered User
2004 KJ Liberty 
 
Join Date: Aug 2008
Location: Central OH/ Moshi Tanzania, Ohio/Tanzania
Posts: 4,430
Thats the traction control kicking in
__________________
04 Liberty, Kilimanjaro Edition, Rock Lizard RockRails/Roof Rack/Front-Rear bumper,32 inch Goodyear Duratracs,Moabs,4.10s/ 4.25 inch JBA Coilover lift /other goodies
tommudd is online now   Reply With Quote Quick reply to this message
Unread 03-09-2014, 09:10 AM   #13
Bmxer524
Registered User
2011 KK Liberty 
 
Join Date: Aug 2011
Location: Lindenhurst, NY
Posts: 1,195
Quote:
Originally Posted by bigx5murf View Post
Guess that explains the tire squeals during tight turns
If you're talking at full lock, that's the front tires. Turning radius is tight on the Libertys. Ever since I added the aggressive tires though I haven't had it.
__________________
2011 Deep Cherry Red KK - Skyslider - OME 927/731 - Bilstein Shocks - 1/4" Spacer Plate - 3/8" Clevis - Al's A-arms - 245/75-16 Duratracs
Bmxer524 is offline   Reply With Quote Quick reply to this message
Unread 03-11-2014, 01:43 PM   #14
bigx5murf
Registered User
 
Join Date: Feb 2014
Location: Las Vegas, NV
Posts: 7
Quote:
Originally Posted by tommudd View Post
Thats the traction control kicking in
Definitely not, happens at parking lot speeds at full lock. Sounds like the tire squeals when parking, caused by those drift kids and their welded rear diffs.
bigx5murf is offline   Reply With Quote Quick reply to this message
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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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






Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.