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  #25  
Old 04-29-2012, 04:48 PM
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Re: Front and rear diff fluid change

I have a 2012 Hemi can I be safe to assume that I require for the rear 75W-85 (6303381AA) oil. And now the friction modifier is premixed with the oil from the supplier?
And what is the difference in the front with 195 FIA vs 195 FIA-FE they both take the same oil 75W-85 (05136035AA)
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  #26  
Old 05-12-2012, 12:06 AM
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Re: Front and rear diff fluid change

I put 75W-90 in mine front and rear with friction mod for rear 230 w/ELSD.
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  #27  
Old 05-20-2012, 10:42 AM
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Re: Front and rear diff fluid change

Just recieved the printed owners manual from Jeep. It is a fifth edition. It continues to say 75w140 for the front diff. When is Jeep going to finally clear this up?
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  #28  
Old 01-01-2013, 10:49 AM
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Re: Front and rear diff fluid change

Happy new year all. I will soon need to change the fluid and I am still confused on what to use. The 75-140 or the 75w-85. I have a 2011 wk2 195 front and 215 rear V6.
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  #29  
Old 01-02-2013, 11:13 AM
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Re: Front and rear diff fluid change

Red Line makes a 75W-85 $15 on Amazon. (Says for crossfire)
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  #30  
Old 01-29-2013, 02:32 PM
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Re: Front and rear diff fluid change

I have changed the diff fluid on both Jeeps now. I used Amsoil 75-90 front and rear (230mm w/LSD) and same on my wife's (225mm rear)

My wife's 225mm was a pain, it uses a 14 hex bit but the exhaust pipe is right next to the drain. I used a pry bar to lift exhaust just enough to access with a socket.

According to Jeep's service manual they call out 75w-85 but I used the 75-90.
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Old 01-29-2013, 10:30 PM
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Re: Front and rear diff fluid change

Quote:
Originally Posted by IRISH View Post
I have a 2012 Hemi can I be safe to assume that I require for the rear 75W-85 (6303381AA) oil. And now the friction modifier is premixed with the oil from the supplier?
And what is the difference in the front with 195 FIA vs 195 FIA-FE they both take the same oil 75W-85 (05136035AA)
Does anyone know if the friction modifier is premixed with the oil now?
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  #32  
Old 02-06-2013, 05:01 PM
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Re: Front and rear diff fluid change

The Mopar fluid doesn't require an additional modifier, any other fluid may or may not. I added it with Amosil fluid, wont hurt it.
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  #33  
Old 03-25-2013, 11:19 AM
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Re: Front and rear diff fluid change

Differential fluid change notes: All, I changed the front and rear differential fluid today in my wk2 and here are some tips to help you along the way. Always take out the fill plug first. This way you know you will be able to refill it.

The front plugs are located from the passenger side- They are 8mm. You will need an allen wrench with a shorter L to get to the fill plug as the oil pan is in the way. (I had to cut mine shorter with a hacksaw to get it to fit). It took about 1.5 quarts of 75w-85 fluid. I used red line from Amazon and a fluid pump to make it easier.

The rear uses a 14mm. The drain is on the passenger side and the fill on the drivers side. Again, I had to use an allen wrench because the drain plug is near the exhaust pipe and there is little clearance for a socket and wrench. Again about a 1.5 quarts.

Pretty easy to do. I had 32K miles and the fluid was pretty dark already.

Good luck!
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  #34  
Old 04-01-2013, 08:10 AM
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Re: Front and rear diff fluid change

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Originally Posted by wjs81866 View Post
The Mopar fluid doesn't require an additional modifier, any other fluid may or may not. I added it with Amosil fluid, wont hurt it.
Not all the Mopar 75W-85 gear fluid has the additive for the ELSD.

I changed both differentials this weekend and the rear ELSD differential was rather dark. The front differential was slightly discolored. I was surprised how clear front fluid was. IMO if you don't want to change the front diff you can probably get away with it for this first interval, but the rear ELSD needed to get changed at 30k.
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  #35  
Old 04-03-2013, 11:53 PM
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Re: Front and rear diff fluid change

Quote:
Originally Posted by Scottina06 View Post
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. "
Hi, 1st off, im gonna apologise for the Thread Hijack. im researching the possibility of using 85W90 + FM in my 05 QD2 JGC. (WK1's need 75W140 right?)
When looking into the viscosity compatibility alone,
  • is the rear ELSD on the WK2 the same Egerotor Type as in a WK1? (if so it would mean the ELSD is not picky on 140vs 85/90 gear oils)
  • the WK2 rear is ALU right? vs the WK1 steel rear. im wondering if ALU's better heat sink properties are partially responsible for lowering the prev' yrs rating down to 85.(if so, this would possibly mean a Higher Vol' deep diff cover with fins should get me in the ballpark to use a 85).
thanks , & once again, sorry for the Hijack OP
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  #36  
Old 07-30-2013, 11:39 AM
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Re: Front and rear diff fluid change

This is so confusing... I thought I'd add more!

I went to my dealer and they were very helpful and open, say for the 195mm axle in my 2012 v8 overland with open diffs (no ELSD) it calls for 5136035AA. That's the "crossfire" gear oil because, they say, it is German... Like the crossfire was... It's a GL4 oil which is not GL5.. But in general means it is less slippery iirc.. It can also effect corrosion levels of internal parts, also iirc from my WRX days..

I'm torn because I think in many ways a gear oil is basically a gear oil and my dealer basically said don't worry about warranty issues with other oils, but a German ZF axle designed for GL4 should really have a GL4 in it.. 45$/qt or otherwise.

Redline 75w85 looks like a good option, but it's GL5 and doesn't say it is GL4 back-compatible.

Not only that, but the above part # pulls up GL4 and GL5 spec stuff on google.. AND my owners manual calls for 75w-85 GL5.

This is just ridiculous.


OK, here's more straight from Mobil oil website:

Question: Clarify Comments on Use of GL-5 vs. GL-4 Gear OilConcerning the GL-5 gear oil, on your website you state the following: "Mobil 1 Synthetic Gear Lubricant LS 75W-90 can also be used in rear axles where API Service GL-4 lubricant is recommended." However, you also say in this "Ask Mobil" section that: "Mobil 1 Synthetic Gear Oil is recommended for all applications where a GL-5 lubricant is specified. GL-5 type lubricants, which have a higher level of additive chemistry, can be corrosive to yellow metals such as copper, brass, etc., and in these applications a GL-4 product is usually specified." Can you clarify this disconnect here? Thank you.-- John Goetz, Newport News, VAAnswer: There are transmission applications that recommend API GL-4 type products where we would not recommend using an API GL-5 fluid because transmissions typically have components made from “yellow” metals. However real axles where GL-4 fluids are recommended do not have “yellow” metal components. As a result, the application of an API GL-5 fluid is acceptable.

So Chrysler may have gone to GL5, and not changed the part number, or all the dealers online are mis-repping their products.. And it looks like a GL5 syn oil should work fine.. So now I'm back to probably going with mobil 1 75w-90 front and rear (as the dealer hinted at using!)..
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