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jk 4wd drive service

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jk 4wd drive service

Post  AquilesT on 10/21/2013, 4:48 pm

So i have taken my new to me (2.5 months) JKuR out on the trails twice and after a quick visit to the dealership for some recall work and other diagnostic stuff they suggested i should do the 4wd service...Last time i went out (yesterday) i definitely bumped both my front and rear diffs on some rocks (nothing major) but i guess it was hard enough to cause a tiny leak at the very bottom of each one. After giving it a look on the trails the covers didnt seem cracked or dented so im inclined (hope) to think that they are good but that the seals might be bad specially after the hit. So i figured that this would be a good time to give it a good cleaning and resealing. I might as well do the whole 4 wd service while i'm at it given it was recommended and it has almost 73k miles and not knowing what the PO has done as far as prev maint goes.
(engine oil and tranny oil i will likely take to the dealership(which is horrible) where i purchased the jk since they offer a lifetime powertrain warranty if i do regular maintenance there) but the 4wd maintenance is many miles away on their schedule so i would like to take care of what i can before then.
Any suggestions?
as far as fluids,amounts and different parts that need to be serviced? or write ups?
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Re: jk 4wd drive service

Post  Tonellin on 10/21/2013, 5:21 pm

Loosen up the fill plug on the differential covers, remove differential cover, scrape it down with a combination of a gasket scraper/flat razor to remove all the gasket material on both the housing and the cover.  Be careful not to gouge the metal. Spray down the inside of both the cover and the gears with brake cleaner, let them air dry, put RTV black on the diff cover and bolt it back up.  Wait a little while for the RTV to set and then fill it up (about 1.3qts for d44's) or until it is just below the fill plug.  Do not over tighten the fill plug or it could interfere with your locker

I think that's everything...very easy to do and recommended especially if you're leaking or you've gone through a lot of deep water crossings

I use 75-140 mobil synthetic for the diffs.  It's pretty damn expensive at $20/qt but it's required for the LSD rear ends in rubicons.  I'm pretty sure the JK is the same.  You might be able to get away with 80w90 in the front diff but I'm not sure.  The diff oil can add up so make sure you do a real thorough job scraping the rtv and sealing correctly.  The worst is when you do everything, and still have a small leak because you didnt scrape enough or allow the RTV to set.  You could also look into lubelocker diff gaskets.  No RTV, no cleaning and they are reusable
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Re: jk 4wd drive service

Post  dongalonga on 10/21/2013, 5:51 pm

Don't use RTV. Do yourself a favor and get LubeLocker gaskets. You will thank me!
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Re: jk 4wd drive service

Post  Tonellin on 10/21/2013, 7:08 pm

Yeah, what dongalonga said..I've only ever used RTV prior to this weekend. Ask me how I know about small leaks...two weekends ago I put on my diff cover so I redid everything. I noticed a small leak a couple of days later and said screw it and purchased a lubelocker plus all new diff oil. Put it on this weekend and I'll never have to worry about scraping the front diff again
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Re: jk 4wd drive service

Post  Ryan McKee on 10/21/2013, 10:17 pm

For whatever it's worth I use Valvoline 85-140 with Limited Slip additive in my 8.8 and HP30. I still RTV, but only because I have a few tubes of it. Get the lube locker.

It's an easy job to do yourself. Get a good catch pan for the fluid, and like mentioned, scrape that diff clean before re-sealing. I use brake cleaner as well to clean it up before re-applying a sealant.

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Re: jk 4wd drive service

Post  AquilesT on 10/21/2013, 10:28 pm

Other than the diffs what else needs to be serviced in the 4wd system? Trasfer case? Where do you dispose the used/old oil?

I just receive my chromoly rear shafts so im thinking of doing it all once.
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Re: jk 4wd drive service

Post  Ryan McKee on 10/21/2013, 10:42 pm

TJs take ATF+3 in the transfer case. IMHO, the best smelling (and most pet-deadly) fluid out there. I'd bet JKs are the same. Put all your used fluid into a container and bring it back to wherever you bought the fluid from. By law they have to take it back.

Also, I moved this into tech instead of wrenching scheduling. Just because it's more tech-based than asking for a time for people to help.

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Re: jk 4wd drive service

Post  CrawlingForward on 10/22/2013, 1:44 pm

Yup, to all the above, especially the lubelocker.

When you've got the diff open, take some time to take a look inside and see how it works first hand. It's a huge help for when you're panicking about something later and you're curious how things work.

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