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  #13  
Old 02-15-2012, 09:05 PM
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Re: Front and rear diff fluid change

well after talking to Jeep if you have the 230mm rear axle with ELSD 5.7L you should use:
Mopar® Gear and Axle Lubricant 75W-85 with Modifier
Mopar p/n 68083381AA (MSRP $48.85 per quart)
2011 models: ESLD is Standard on Overland 4x4 5.7L models.
2012 models: ESLD is Standard on Overland Summit, on Overland with Off Road Group II, and on SRT8 models.
Note: A separate limited slip additive is NOT required. Caution: ONLY use Mopar ELSD differential lubricant in the ELSD differential.

Jeep opened a ticket because the manuals are wrong, wk2 site is correct.
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  #14  
Old 02-15-2012, 09:23 PM
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Thanks for calling Jeep.

The manual states 75w/90 which is of no concern going with a 75w/85 if that's what should and is in there. 85vs90 is nothing. The big difference is what is for the front? 75w/140 as per the manual or 75w/85???

That's where the real question lies. Did you do your front diff or only rear at the moment?
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  #15  
Old 02-17-2012, 04:45 PM
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Re: Front and rear diff fluid change

For 5.7L

75W-85 with additive for rear 230mm ELSD, 75w-85 for front W/O additive.
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  #16  
Old 02-17-2012, 10:45 PM
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Re: Front and rear diff fluid change

Quote:
Originally Posted by wjs81866 View Post
For 5.7L

75W-85 with additive for rear 230mm ELSD, 75w-85 for front W/O additive.
Thanks. I am reluctant to change anything at the moment until more research and information is given. The reason I question the 75w/85 in the front;

2005 user manual- Shows 75w/140
2010 user manual- Shows 75w/140
2011 user manual- Shows 75w/140 (I have printed 2nd edition, Have seen latest edition online)
2012 user manual- Shows 75w/140

How can so many years and editions be in-correct? You'd think if 75w/85 was supposed to be in the front, it would have been fixed in the manual 5-7 years ago not just recognized on your phone call a few days ago. No doubt do I have any reason to believe Jeep Customer Service didn't tell you that 75w/85 is for the front. But that also doesn't mean its right.

Who can we bring this issue up to?
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  #17  
Old 02-18-2012, 09:28 AM
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Re: Front and rear diff fluid change

was the front on previous independent suspensions aluminum?
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  #18  
Old 02-18-2012, 10:53 AM
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Re: Front and rear diff fluid change

According to ringpinion.com its a C200 IFS diff in both years (which might be true). Then on mopar, where you can break down and see parts, it shows a 195mm in the 2010 and a 200mm in the 2011 but doesn't necessarily show the name/type of diff.
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  #19  
Old 02-18-2012, 01:13 PM
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Re: Front and rear diff fluid change

Just left the dealer, he looked it up in the service manaul and mine calls out 75w-85 for the front. Apparently the aluminum on the 2011 is the difference. 2011's, according to the service manaual are 195mm aluminum with no ELSD. 2010 was cast steel and used 75w-140.

I'm comfortable with the dealer info, they had one of the machanics that work on the drivelines come out and tell me the same. He said that I may or may not agree with the fluid they state to use but that is what I must use for warranty. If it's not covered he said use what you want.
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  #20  
Old 02-18-2012, 04:36 PM
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It's funny we're the only two that seem to care about the situation. I'll have to talk to my dealer when I'm there next and see what they say as well.
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  #21  
Old 02-21-2012, 03:04 PM
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Re: Front and rear diff fluid change

Quote:
Originally Posted by wjs81866 View Post
wk2 site is correct.
The specs on the WK2 site match exactly what is in the latest edition of the 2012 WK2 Factory Service Manual. See attached file.
Attached Files
File Type: pdf 2012_WK_fluid_specs.pdf (104.3 KB, 152 views)
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  #22  
Old 02-26-2012, 11:56 AM
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Re: Front and rear diff fluid change

this is what I just got from Phil Jansen, head engineer for the 2011+ Grand Cherokee


"Per your question on gear oil, the front and rear open ZF differentials use a Fuchs 75w85. The rear ELSD closed differential uses a Castrol 75w85. Please note that we changed the rear open differential mid last year to ZF (lighter and more efficient). The prior open rear differential used a different oil. That may be the cause of the discrepancy. I have asked our team to review and correct. "
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  #23  
Old 02-29-2012, 09:06 PM
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Re: Front and rear diff fluid change

ok... what does mid last year mean? My manufacture date is june 201o and August 2010
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  #24  
Old 02-29-2012, 10:52 PM
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Re: Front and rear diff fluid change

^^ Regardless at least in our case we have the closed ELSD in the rear, so it doesn't pertain to your Jeep, nor mine.
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