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Old 04-03-2012, 07:58 PM   #1
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Question on Max Tow Package and Rear Gear Lubricant

Forgive me if this is a repost, but I did a search and could not find a good answer for this. My JKU is due in late next week, but Jeep just sent me my Owner's Manual and I was reading through it tonight and noticed that for trailer towing, a "special rear axle lubricant is required."

My question is, if I have the Max Tow Package, does the rear differential come from the factory with this "special lubricant" in it? Seems strange that it is not specified, as if you order the Max Tow Package, it would only make sense that this requirement is met.

Any ideas? Will I have to change the diff fluid before I want to tow for the first time? Thank you in advance for any information you might have!

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Old 04-03-2012, 09:58 PM   #2
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From what I read, no it does not. I switched mine to 75w-140 per the owner's manual just to be 100% sure.

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Old 04-03-2012, 09:58 PM   #3
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Jeep recommends 75W 140 gear oil for towing. Normally it would be 75W 90. You'll be fine with what comes from the factory. If you do a lot of towing and/or off roading, I would change the fluid at 15k.
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Old 04-03-2012, 10:20 PM   #4
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If I remember correctly the additive is for the limited slip rear end and has nothing to do with the towing package. This is from page 561 in the manual

"226 RBI (Model 44) - MOPAR Gear & Axle Lubricant (SAE 80W-90) (API
GL-5) or equivalent. For trailer towing, use MOPAR Synthetic Gear & Axle
Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-Lok™
require an additive."
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Old 04-03-2012, 10:35 PM   #5
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Quote:
Originally Posted by cmgrant View Post
If I remember correctly the additive is for the limited slip rear end and has nothing to do with the towing package. This is from page 561 in the manual

"226 RBI (Model 44) - MOPAR Gear & Axle Lubricant (SAE 80W-90) (API
GL-5) or equivalent. For trailer towing, use MOPAR Synthetic Gear & Axle
Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-Lok™
require an additive."
That was the first thing I did after installing the Curt reciver hitch. Had the Jeep dealer give me my first oil change(@750 miles & free) and had them change the rear gear oil to MOPAR Synthetic Gear & Axle
Lubricant (SAE 75W-140) so it is recorded as being done to honor my Lifetime Warranty.
Never enough CYA for the Lifetime Warranty.
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Old 04-03-2012, 10:36 PM   #6
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-All the syn-oils in 75w-140 are supplied/w LSD additive already-


Quote:
Originally Posted by cmgrant View Post
If I remember correctly the additive is for the limited slip rear end and has nothing to do with the towing package. This is from page 561 in the manual

"226 RBI (Model 44) - MOPAR Gear & Axle Lubricant (SAE 80W-90) (API
GL-5) or equivalent. For trailer towing, use MOPAR Synthetic Gear & Axle
Lubricant (SAE 75W-140) or equivalent. Models equipped with Trac-Lok™
require an additive."
sd

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Old 04-04-2012, 05:29 AM   #7
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Thanks everyone for the feedback and help! Seems strange to me that Chrysler wouldn't put the towing specified diff fluid in the vehicles with the tow packages from the factory, as people order it so they can tow! I won't be doing any major towing in the beginning any way, so to be safe I'll be changing it out down the road.
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Old 04-04-2012, 06:45 AM   #8
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Quote:
Originally Posted by WarEagle View Post
Thanks everyone for the feedback and help! Seems strange to me that Chrysler wouldn't put the towing specified diff fluid in the vehicles with the tow packages from the factory, as people order it so they can tow! I won't be doing any major towing in the beginning any way, so to be safe I'll be changing it out down the road.

Who said they didn't? If it came from the factory with the tow package, it should have 75W 140. If it was a dealer add-on, they probably didn't change it.
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Old 04-04-2012, 10:49 AM   #9
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Quote:
Originally Posted by daggo66

Who said they didn't? If it came from the factory with the tow package, it should have 75W 140. If it was a dealer add-on, they probably didn't change it.
That was my thought as well, but from the posts above it sounds like they don't. The manual is not clear on this. Guess I'll have to contact Jeep directly and see if they know. If it is called out in the manual has having to be changed before towing, I am inclined to say the factory fill has to be changed.
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Old 04-04-2012, 10:56 AM   #10
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I don't know what the new maintenance schedules call for, but in my '08, it calls for first INSPECTION at 18,000 miles--

Then if you are towing/off-roading heavy/police chasing (running away)--changeit to syn 75w-140 !!

Otherwise don't worry !!

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Old 04-04-2012, 11:39 AM   #11
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That was my thought as well, but from the posts above it sounds like they don't.
I don't see a single post that implies they don't.
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Old 04-04-2012, 12:51 PM   #12
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Quote:
Originally Posted by daggo66 View Post
I don't see a single post that implies they don't.
I don't think any of us now for sure, but foo.c (2nd post) indicated that it doesn't. I am inclined to agree, but hope that I am wrong. Not trying to argue with anyone, just trying to determine what is what on the rear diff fluid and set the record straight. I wish Chrysler was more clear on the wording in the manual. Again, appreciate everyone's feedback and information on this topic!
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Old 04-04-2012, 01:07 PM   #13
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Sorry if I got you in trouble with the forum police. I don't know one way or the other. I read some other forum I guess where there wasn't a clear "yes" for an answer and just decided to go ahead and change it.

It would be nice if it said clearly in the owners manual that you get 75w-140 with the tow package.
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Old 04-04-2012, 02:44 PM   #14
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Quote:
Originally Posted by foo.c
Sorry if I got you in trouble with the forum police. I don't know one way or the other. I read some other forum I guess where there wasn't a clear "yes" for an answer and just decided to go ahead and change it.

It would be nice if it said clearly in the owners manual that you get 75w-140 with the tow package.
You didn't get me in trouble, no worries at all. I appreciate your input and research feedback. I think it is a very confusing topic and we all have our ideas and opinions, that's what makes this forum so great! I enjoy the discussions and hope one of us is able to find out what the factory is using for the rear diff fills on max tow vehicles.
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Old 04-04-2012, 02:44 PM   #15
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If you have the factory tow package, I wouldn't sweat it for one minute. If it was a dealer add on, then I would change it.
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Old 04-04-2012, 04:06 PM   #16
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You have a 12 w/ max tow from the factory you have the proper fluid in it. Follow the recommendation from the manual if you tow or otherwise severe duty and you're fine. The manual indicates that when you do change it use the syn 75W 140, like Daggo previously indicated.
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Old 04-04-2012, 04:29 PM   #17
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If you have the factory tow package, I wouldn't sweat it for one minute. If it was a dealer add on, then I would change it.
Quote:
Originally Posted by kik View Post
You have a 12 w/ max tow from the factory you have the proper fluid in it. Follow the recommendation from the manual if you tow or otherwise severe duty and you're fine. The manual indicates that when you do change it use the syn 75W 140, like Daggo previously indicated.
Thanks guys! And kik, thank you for confirming if we have the Max Tow that the correct diff fluid is in it. Seemed odd that it would not be, as you order the tow package to TOW with. Will certainly be following the manual on changing the fluid and will be sure to use the correct weight and additive for the limited slip.

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