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I havent but want to know for future as well if anybody has and what they have done.
 

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I would do the transfer case every 30K on my 14 SRT. Haven't got that many miles on Trackhawk yet. Used Castrol ATF4
 

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2018 Jeep Grand Cherokee Trackhawk
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I would replace front & rear diff @ 24K cheap insurance and transfer @ 30K, when I bought my Jeep all three were low on fluid, just like my last 3 Chrysler products. Changed rear end fluid in my 300 SRT couldn't believe how dirty looking the oil was with 24K on the oil. Be sure to get friction modifier for rear diff. Wish there was a easy way to check transmission level, took my 300 to dealer to have trans check got it home still low, I had bought one of those Dorman dip sticks that you have to calculate level based on trans temperature.
 
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Okay so which 1 - 75w85 or 75w90?
 

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2018 Jeep Grand Cherokee Trackhawk
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I use Mobil 1Synthetic 75w-90 LS(limited slip formula) both front & rear; with Mopar friction modifier only in rear, and Mopar ATF+4 for transfer case
 
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I use Mobil 1Synthetic 75w-90 LS(limited slip formula) both front & rear; with Mopar friction modifier only in rear, and Mopar ATF+4 for transfer case
how much fluid did you have to use? reuse plugs?
 

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2018 Jeep Grand Cherokee Trackhawk
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I would say not more than 2 qts for rear, add additive 1st for rear diff, not sure about front would say not more than 2 qts but have ever changed it yet. I have 5 gallon pal with pump so I can't really say. We use a lot of it between 2 pickups, semi truck and all the other vehicle my son & I have to service. I've always reused plug with the metal gasket with no leaks or drips. Don't know how much ATF+4 for transfer case, not more than 4 qts????
 
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So I'm assuming less then a Quart for transfer case?
 

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2018 Jeep Grand Cherokee Trackhawk
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Transfer case takes ATF+4 (automatic transmission fluid) and should take several quarts but not sure, could be 2, 3 or ??. Have never changed mine yet.
 
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shoot I only bought one quart for transfer case lol
 

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Pretty sure that there should be a fluid requirement breakdown in the owners manual if you want to know what the manufacturer says.
 

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2018 Jeep Grand Cherokee Trackhawk
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I looked only shows motor oil, gas tank, anti freeze capacities, nothing for transmission, transfer case, front or rear diff except what type of product to use. I always write down in back of manual what I put in. But like I said earlier I use pump pal for diff until it runs out. I do remember that 8 speed trans take about 9 quarts + or - from what I read, what a pain to change fluid in these transmission but I'll probably try since I've seen some outrageous cost & labor to have this done $800 plus
 

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Found this. Someone else confirm it’s for our Tcase

 

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so it looks like 2.2 Quartz for Transfer case
 

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2018 Jeep Grand Cherokee Trackhawk
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Yea the above article from Jeep Garage is very confusing with all the variances, but seems it should be filled to drain hole. How else would you know if it was low???? .9 quart for front diff, 1.4 quart for rear diff from chart in Jeep Garage, I will check this when I change my fluids with quart containers, still going to fill to bottom of fill hole.
 

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crazy fluid filled to drain hole You would think that would be too low of fluid
 

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don't you mean filled to fill hole
 
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yes fill it till it comes out the fill hole
 
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