Long term reliability of HTRAC AWD transfer case due to inability to change the transfer case fluid?

[Hugh185]

go directly to 7min30 shocking

 

[EdP]

go directly to 7min30 shocking

I'd expect it to look dirty. If they did an oil analysis it would be meaningful.

 

[Hugh185]

Hyundai (not specifically Genesis) recommend a transfer case oil change at 60k so it should be possible.

But the shop manual says

do not check, refill and replace the transfer case oil because the oil for the transfer case only (ultra high viscosity of ATF Shell TF 0870) is filled when coming out of the factory

Do not check and replace the oil

No drain plug

in case that the transfer case (AWD) oil related failure code (DTC) appears, replace the transfer oil case assembly


Really ????

 

[Kraig Wilkinson]

Hyundai (not specifically Genesis) recommend a transfer case oil change at 60k so it should be possible.

But the shop manual says

do not check, refill and replace the transfer case oil because the oil for the transfer case only (ultra high viscosity of ATF Shell TF 0870) is filled when coming out of the factory

Do not check and replace the oil

No drain plug

in case that the transfer case (AWD) oil related failure code (DTC) appears, replace the transfer oil case assembly


Really ????

The transfer case is one of those things.. as long as it makes it past a certain mileage Hyundai, Genesis, BMW, ETC, ETC, dont really care what happens. I believe it is a $ thing..

 

[Hugh185]

The transfer case is one of those things.. as long as it makes it past a certain mileage Hyundai, Genesis, BMW, ETC, ETC, dont really care what happens. I believe it is a $ thing..

One hyundai Technician just sent to me some pictures of the 2015 G80 workshop manual, and they explain how to change the oil (they even give the reference of the Oil type : Shell TF0870, same TF found in the BMW and Porsche Transfer case) so yes it is possible to change the Transfer case oil.
They recommend to take the case off the vehicle to proceed to the oil change, but maybe it is doable while the case attached to the kinematic chain.

 

[Kraig Wilkinson]

One hyundai Technician just sent to me some pictures of the 2015 G80 workshop manual, and they explain how to change the oil (they even give the reference of the Oil type : Shell TF0870, same TF found in the BMW and Porsche Transfer case) so yes it is possible to change the Transfer case oil.
They recommend to take the case off the vehicle to proceed to the oil change, but maybe it is doable while the case attached to the kinematic chain.

That would be nice if one could service it. Extend the life of the unit.

 

[Btarter]

2020 genesis g70 manual recommends 36k diff pil change if you have a limited slip Differential. I'm questioning it myself

 

[Kraig Wilkinson]

2020 genesis g70 manual recommends 36k diff pil change if you have a limited slip Differential. I'm questioning it myself

They don't hold much fluid. I did my 15 5.0 at 32k and Iam glad I did. I was nasty.

 

[Btarter]

They don't hold much fluid. I did my 15 5.0 at 32k and Iam glad I did. I was nasty.

Thank you. Guess it's a must and the dealer will know how to change it.

 

[Btarter]

Wondering if theres a drain and fill plug?

Thank you. Guess it's a must and the dealer will know how to change it.

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[Husky]

There's definitely a drain plug, I can see it under the car, so I would expect there is a full plug.

 

[Btarter]

There's definitely a drain plug, I can see it under the car, so I would expect there is a full plug.

Thanks husky verymuch appreciated

 

[Hugh185]

I just had a thorough look at the actimax from Magna. With 5 millions units sold to and installed by BMW I started looking at the "bimmer" forums.
It seems the actimax has a design flow without getting into details friction points. Most of them start having issues around 40k miles. 2016 X5 for exemple
Gutted as I could find one 3.8 but it puts me off to know that I have to "plan" to spend between 2500 and 5000 usd when I will face the problem

 

[socrbob]

Just checked under my new G70. I am unsure if there is a drain bolt, but there is one possible bolt I'm seeing. Keep in mind though, it's such a tight fit in there that you may have to completely remove the case to figure out a way to re-fill it. And I don't even know if this bolt is high enough to refill it, or low enough to drain all of it...

Here are some really up close pics to illustrate. Sorry I don't have a gigantic hydraulic lift in my tiny garage.


Xfer case P/N?
View attachment 18974

Driver's side, rear facing portion of lower case...
View attachment 18975

Possible fluid access here, but doesn't seem low enough for a real drain bolt... This is the passenger side rear facing portion of the case. More likely this bolt is to hold something together inside the case, and isn't mean for fluid access at all.
View attachment 18976


Bottom of the case...
View attachment 18977


Rear prop shaft. Notice the rubber damper ring that attaches the shaft to the case.
View attachment 18978


And finally, front prop shaft.
View attachment 18979


Thoughts....
First of all, the case is pretty small/compact. It really doesn't look like it would be too horrible to remove it. Would be a little more complicated than pulling a rear differential, but totally doable. That said, if you had to replace it, it's a job I would feel comfortable doing on my own. But, on that same note, at some point maybe it wouldn't be such a bad idea to try and service it later on down the road. You could technically split it in half without a huge hassle once the case is out and change fluids, but without a service manual I wouldn't dare do that.

Other things to note...
The auto tranny looks like a breeze to drain the fluid and/or remove the entire pan. Problem is, I don't know how to refill it. Can't find any spot when looking in the engine bay. Lol.

Thanks for all the info. How do you keep the underside so clean?

 

[Toddasaurus]

Thanks for all the info. How do you keep the underside so clean?

Well, it was pretty dang new when I snapped those pics! Haha. Not so clean now.

 

[socrbob]

Well, it was pretty dang new when I snapped those pics! Haha. Not so clean now.

Sorry, I missed the date on your original post. Now realize why so clean.

 

[rmod]

IMO, the first code that will be thrown is once the clutch pack inside the transfer case wears down to the point that is beyond what the 4WD controller can compensate for...inturn fouling the oil. The other scenario is the stripping of the splines as seen in many BMW transfer cases. This is probably not an issue unless the owner is tracking / launching / tuning a lot. Either way replacement of transfer case looks pretty straight forward, but we'll need the Hyundai GDS VCI tool for resetting the 4WD controller to forget the clutch compensation.

 

[Btarter]

IMO, the first code that will be thrown is once the clutch pack inside the transfer case wears down to the point that is beyond what the 4WD controller can compensate for...inturn fouling the oil. The other scenario is the stripping of the splines as seen in many BMW transfer cases. This is probably not an issue unless the owner is tracking / launching / tuning a lot. Either way replacement of transfer case looks pretty straight forward, but we'll need the Hyundai GDS VCI tool for resetting the 4WD controller to forget the clutch compensation.

So many knowledgeable people here. Thank you all so happy I joined. Love the car and plan on keeping it for years to come. Just got my first monthly health report from genesis connect . Love it all green! I'm going to suggest transfer case and diff component health to be added. See how receptive genesis is as they are reportable components and major driveline.

 

[Kraig Wilkinson]

Wondering if theres a drain and fill plug?

There is a drain and a fill on the rear diff of 15 5.0. Very easy to service . Apologize for the late response .

 

[Btarter]

There is a drain and a fill on the rear diff of 15 5.0. Very easy to service . Apologize for the late response .

Was told by my service department there is a fill and drain on front and rear diff and transfer case. At 36K 120 to drain and fill the rear but for 399 they would do front and rear diff and transfer case drain and fill. Most expensive is the fluid they said and said it was easy. Thoughts? When the time comes do it all? The manual calls for rear diff fluid change with LSD. Inspect transfer case didnt see a front diff recommendation. Want to make sure they know what they are talking about do I need the forum pros who own them. Thanks