Going to Change my Differential fluids soon, What weight gear oil? - JeepForum.com

 
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post #1 of 14 Old 03-04-2014, 08:35 PM Thread Starter
bigx5murf
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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?

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post #2 of 14 Old 03-04-2014, 09:13 PM
tjkj2002
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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
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post #3 of 14 Old 03-05-2014, 10:35 AM
cougargnw
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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
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post #4 of 14 Old 03-05-2014, 11:10 AM
lfhoward
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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
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post #5 of 14 Old 03-05-2014, 11:45 AM Thread Starter
bigx5murf
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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.
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post #6 of 14 Old 03-05-2014, 01:18 PM
AtTheHelm
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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.
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post #7 of 14 Old 03-05-2014, 03:11 PM
tommudd
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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 KJ 4.5 JBA lift, 03 KJ 2.5 JBA coilovers,
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post #8 of 14 Old 03-05-2014, 11:08 PM
tjkj2002
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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
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post #9 of 14 Old 03-05-2014, 11:26 PM
Skipper6413
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Aaaand don't forget the friction modifier...its required in limited slip diffs.
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post #10 of 14 Old 03-06-2014, 12:13 AM
Bmxer524
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We don't have factory limited slips. Open diffs front and rear on all KKs.

2011 KK - Skyslider - JBA Adjust-A-Strut - OME 731 - Bilstein Shocks - JBA UCA- 245/75-16 Duratracs
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post #11 of 14 Old 03-09-2014, 03:53 AM Thread Starter
bigx5murf
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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
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post #12 of 14 Old 03-09-2014, 04:02 AM
tommudd
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Thats the traction control kicking in

04 KJ 4.5 JBA lift, 03 KJ 2.5 JBA coilovers,
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post #13 of 14 Old 03-09-2014, 08:10 AM
Bmxer524
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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 KK - Skyslider - JBA Adjust-A-Strut - OME 731 - Bilstein Shocks - JBA UCA- 245/75-16 Duratracs
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post #14 of 14 Old 03-11-2014, 12:43 PM Thread Starter
bigx5murf
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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.
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