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  #13  
Old 02-29-2016, 04:25 PM
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Re: Differential Service Interval on 2014?

I just performed the service on the diffs and transfer case this past weekend at 37k miles. The rear definitely needed to be changed out and probably should have been done much earlier. It was very black and very shiny. I think 25k is probably a good time to do the rear.

The front diff wasn't too bad and could have gone for another 10k-15k miles. I would do the front at the same time as the rear but keep in that if you have the skid plate, it will have to come off. At least it is only held on by four bolts, so easy enough to take off.

The transfer case was still completely clear, well red since its ATF4, and I definitely could have gone much longer on tham that. Again, if you have the skid plate, it will have to come off. This one is held on by five bolts, if I remember correctly. It helps if you have another person to put it back on though I was able to reinstall it by myself.

Edit: I used mopar fluids and I paid about $38 per quart for the diffs and $7 for ATF4 for the transfer case. I bought three quarts of each, ended up using 2 quarts even for the diffs and a little over 2 quarts for the transfer case.

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  #14  
Old 03-01-2016, 10:58 PM
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Re: Differential Service Interval on 2014?

Appreciate all the good info here.


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  #15  
Old 03-04-2016, 09:44 AM
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Re: Differential Service Interval on 2014?

Quote:
Originally Posted by Benn0 View Post
I know it's an old post from Benn0 but that info is incorrect for NA versions according to the FSM.
Schedule A would be inspect level every 24k miles up till at least 120k miles (I didn't go further). Never calls to change it.
Schedule B calls for changing it if using for taxi, towing, etc.

It takes an hour to do and that includes the time it takes to get the box off the porch from AMSOIL and make coffee. So why not do it.
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Old 03-04-2016, 10:21 AM
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Re: Differential Service Interval on 2014?

Also quick note on torque specs for the diffs. Had to call the dealership for these but they are 14ft-lbs for both the drain and fill. The transfer case is 15-25ft-lbs. I tightened mine to 18ft-lbs.
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  #17  
Old 03-04-2016, 10:40 AM
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Re: Differential Service Interval on 2014?

Yeah, forgot about that! Found out when I did mine a couple years ago. I don't put a lot of faith in that site.
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Old 03-05-2016, 02:57 PM
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Re: Differential Service Interval on 2014?

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See attached from the 2014 owners manual. It seems to me for front diff 75w140 gear oil is recommended. For rear 75w90 if you have elsd or 75w85 if you dont.

Seems a bit different from what is posted on wk2jeeps.com. Additionally as somebody posted I don't see anything about changing the oil under normal usage.


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Old 03-05-2016, 04:18 PM
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Quote:
Originally Posted by Roki303 View Post
See attached from the 2014 owners manual. It seems to me for front diff 75w140 gear oil is recommended. For rear 75w90 if you have elsd or 75w85 if you dont.

Seems a bit different from what is posted on wk2jeeps.com. Additionally as somebody posted I don't see anything about changing the oil under normal usage.

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Check the revison of the owners manual you are looking at. There are 8 revisions on the 2014 GC manual. Make sure you are on the 8th. The service manual for 2014 states 75w85 for the front and the rear and of course friction modifier if you have elsd rear
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Old 03-05-2016, 08:14 PM
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Re: Differential Service Interval on 2014?

Good point. Will do that.

I just did rear diff @25k miles. What came out was scary - very dark goo ... Glad that I did it. Will do front as well. Rear was very easy to do with a cheap hand pump.




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Old 03-06-2016, 07:24 AM
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Re: Differential Service Interval on 2014?

I also checked the latest owners manual (8th edition) and indeed 75w85 is recommended for front and rear (w elsd and not). That being said since they recommended earlier 75w90 in rear and 75w140 in front therefore it seems that using 75w90 is ok.

Guessing that change here was dictated by profit margin. I bet you if 75w85 would be stocked by car parts places they would come up with 75w87.5.


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Old 08-21-2016, 02:37 PM
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Re: Differential Service Interval on 2014?

Did transfer case this weekend @ 29K miles. Actually to my surprised the fluid that came out was not bad but wasn't great either. Probably could have went another 10-20K. The fluid definitely looked dark and there was a some silver things floating around.

Eventhough I didn't have to be changed right now I am glad that I did and would advise everybody to do the same. Super easy.

One thing though ... transfer case took about 2.2 quarts so a bit over (filled until fluid started to spill back from the fill hole). The spec calls for just under 2 quarts, just wondering if I overfilled or something ...

As far as skid plates are concerned. The trick is to loosen certain bolts (the ones that alow adjustment) and just slid the plate off instead of dropping it to the ground. Than to put it back in you just slide it back in and reinstall the reminding screw. Very easy to do once you have the technique covered.
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Old 08-23-2016, 10:12 PM
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Re: Differential Service Interval on 2014?

Depends on which case you have. I read somewhere on here that one of them required you to make a dipstick to stick in the hole and check the level as it was not supposed to be at the fill hole.
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