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Old 10-12-2009, 10:54 PM   #1 (permalink)
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Has anyone changed the gear oil in the transfer case and/or rear differential on their SF? Are the drain plugs and filler plug accessible? Will I need to purchase any gaskets for the plugs?

My '07 SF is currently at 32K miles. I've already replaced the transmission oil at 30K miles with the help of the posts in this forum. Thanks everyone. The owner's manual states to change the gear oil in the transfer case at 60K and at 30K for severe service with SAE 70W/90 (Shell Spirax 'X' Equivalent) but on the hmaservice website it lists SAE [b]75W/90 as the gear oil. Which one is the correct one to use? Any recommendations on the gear oil to use?
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Old 10-12-2009, 11:31 PM   #2 (permalink)
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It's up to you. If it was my car, I wouldn't hesitate to use the 75w-85 synthetic stuff at Walmart. Of course you could buy the OEM stuff from Hyundai. Mobil 1 sells a 75w-90 synthetic gear oil.
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Old 10-14-2009, 07:22 PM   #3 (permalink)
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Thanks jsinton! I'll try some of the gear oil from WM. Is changing both the rear diff and transfer case gear oil at 32k miles too early? I don't tow but my commute is about 50/50 highway/city.
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Old 10-14-2009, 07:31 PM   #4 (permalink)
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Yep, I've got to work up the ambition to do my 2008 AWD now that I'm at 41500mi. I picked up a cpl qts of Walmart Supertec 75w90 synthetic blend gear oil. When I recently drained/filled my transmission, I could see the drain plug on the transfer case. It was a big hex head deal like the trans drain plug. I have yet to look at the rear diff or the fill plugs on the sides of the xfer case and rear diff. Main thing w/ either box is; Make sure you can loosen the fill plugs before you try the drain plugs.

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Old 10-14-2009, 08:03 PM   #5 (permalink)
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QUOTE (2007hsf @ Oct 14 2009, 07:22 PM)
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Thanks jsinton! I'll try some of the gear oil from WM. Is changing both the rear diff and transfer case gear oil at 32k miles too early? I don't tow but my commute is about 50/50 highway/city.
Actually, according to the owners manual, it says to inspect at 30k and 60k and to drain/fill at 75k (miles) for the transfer case. For the rear case is never says to drain/fill, just to inspect every 30k. It's up to you, I'd just follow the owners manual.
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Old 10-14-2009, 09:38 PM   #6 (permalink)
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QUOTE (jsinton @ Oct 14 2009, 05:03 PM)
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Actually, according to the owners manual, it says to inspect at 30k and 60k and to drain/fill at 75k (miles) for the transfer case. For the rear case is never says to drain/fill, just to inspect every 30k. It's up to you, I'd just follow the owners manual.
I'm with him...no reason to spend money if not necessary.
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Old 10-14-2009, 10:10 PM   #7 (permalink)
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Thing is; Why would you go through the pain and anguish of removing the fill plug to "inspect" the rear diff oil and not just dump/fill it? Normally I'd agree to leave it alone, just like rear diffs were left for decades, but having changed the rear diff oil on some late model truck/truck based vehicles, the rear diff oil can look horrible, as did the debris magnet. My point is; If you're going to do the xfer case, might as well do the rear.

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Old 10-15-2009, 03:05 AM   #8 (permalink)
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QUOTE (PoMansAWD @ Oct 14 2009, 07:10 PM)
Quote:
Thing is; Why would you go through the pain and anguish of removing the fill plug to "inspect" the rear diff oil and not just dump/fill it? Normally I'd agree to leave it alone, just like rear diffs were left for decades, but having changed the rear diff oil on some late model truck/truck based vehicles, the rear diff oil can look horrible, as did the debris magnet. My point is; If you're going to do the xfer case, might as well do the rear.

Joel
Isn't this part of the drive train?

If I am not mistaken, it should be warrantied for 10 years or 100,000 miles.

I have owned cars in the recent past with well over 100,000 miles and never changed the differential oil, including my 1988 Hyundai Excel with well over 100,000 miles.

This brings to mind a 1976 Oldsmobile Delta 88, Hurst Edition that had with over 200,000 miles and the same gear oil in the rear end.

Just how long do you people actually plan on keeping these vehicles? Forever? Perhaps even longer?

Seriously, quit worrying about things that have no merit, unless you are actually beating the crap out of your Santa Fe. In that case, do what you have to do but chances are, your beat up Santa Fes wont last that long anyway.

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Old 10-15-2009, 03:32 AM   #9 (permalink)
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QUOTE (david-paul-1 @ Oct 15 2009, 03:05 AM)
Quote:
Seriously, quit worrying about things that have no merit, unless you are actually beating the crap out of your Santa Fe. In that case, do what you have to do but chances are, your beat up Santa Fes wont last that long anyway.

Daivd <><

The most I've got is 5/60 warranty. I'm a 'subsequent owner' and my 2008 was a rental at one point. Some years back, I was amazed at how black and nasty the rear diff oil looked in my 2005 Chevy Trailblazer 4x4 when I changed it at ~2yrs of age and ~27Kmi. The magnet was covered in goo as well. This vehicle was also a rental at one point in it's life. Is/was there merit in changing it? Possibly not. It makes me feel better knowing what I have in there and the condition of it. Kind of the point in participating in car forums IMO. I don't do chrome and cold air intakes, so I've gotta post about something!

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Old 10-15-2009, 04:10 AM   #10 (permalink)
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I've never had my rear end oil changed out and have never had a problem, now at 129k. This is my experience.
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