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Yukon Xl Denali Fluid Suggestions (tranny, Xfer Case, Diff)


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#1 bcobb

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Posted 28 June 2010 - 05:50 PM

Hello everyone, great forums!
I am very new to the Yukon Denali. I just bought a very nice XL with 48k on it. I'd like to change the tranny, transfer case and rear diff fluids. Can someone recommend to me the best fluids to put in (Redline/Amsoil...etc), I'm assuming synthetic. I've also read some conflicting facts as to whether the factory used full synthetic or semi-synthetic. I won't be doing any regular towing, just pulling the occasional utility trailer with a garden tractor or dirt bikes.
Thanks in advance!
-Bryan
2007 Yukon XL Denali

Edited by bcobb, 28 June 2010 - 06:02 PM.


#2 bluArrow

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Posted 28 June 2010 - 08:00 PM

It's an oil question! :thumbs:

Oil type/brand is one of those topics where everyone has an opinion and most of us change it so often that it really doesn't matter.

I personally use full synthetic oil everywhere possible.

#3 bcobb

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Posted 28 June 2010 - 08:19 PM

Thanks bluArrow, I know...these questions get asked 1,000 times per day on these forums! I'm looking for something that does well in these vehicles though, maybe something that the majority uses with no issues? Or is it really one of those deals where you can't get is wrong (because I don't believe that is the case)?
Thanks!
-Bryan

#4 MikeyZ

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Posted 28 June 2010 - 08:25 PM

Heck, with 48k miles I'd just let it go and change it all in a year or two.

The trans fluid should be Dex VI which is synthetic. Use synthetic for the rear diff too. Transfer case fluid is probably the blue GM synthetic fluid.

#5 Black02Silverado

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Posted 28 June 2010 - 08:26 PM

Bryan,

Welcome to GMT! This site has a ton of good info. Just use the search feature for most topics you might have. Most have been talked about on here several times over.

As for your transmission. You need to run a Dexron VI fluid. You can pick it up at most auto parts stores. AMSOIL makes a Dexron VI fluid that you can use in your transmission as well.

The transfer case is more than likely the GM AutoTracII fluid that you have to get at the dealership. If you have the auto four wheel drive push button then it takes the AutoTracII fluid. It isn't to expensive and you will need right at two qts. I would get three to have an extra on hand.

Your rear differential takes a 75w-90 weight gear oil. A synthetic fluid is required for this. You can pick up Mobil 1 at the local Wal-Mart or you can get Royal Purple as some Auto Parts stores. AMSOIL has the Severe Gear oil for this application as well.

That pretty much covers it. If you are interested in getting AMSOIL fluids let me know and I can send you a quote for what it would cost to do everything with all the fluids shipped to your door.

Nick
Black 02 Silverado Z71, 5.3L Amsoil Fluids Black Bear Tuned with AutoCal
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AMSOIL Synthetic Lubricants & Filtration Systems, Click Here
Wholesale pricing available!

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#6 bcobb

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Posted 28 June 2010 - 09:35 PM

Mikeyz: I had to check my owners manual again and you are partially right. Tranny oil under normal driving is not until 100k, however xfer case is 50k. It doesn't say anything about the diffs. Thanks everyone, EXTREMELY helpful and I appreciate the responses.

Nick: Going to wait in the tranny but will change the transfer case. Will let you know if I go the Amsoil route!

Thanks again gentlemen!
-Bryan

#7 MikeyZ

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Posted 28 June 2010 - 09:53 PM

Could have sworn that my manual said 100k on the diff. I have 2wd though. I think I bought the Red Line synthetic from Summit Racing as they are local to me.

#8 Rat4Go

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Posted 01 July 2010 - 08:10 AM

WHEN you do the trans (it's too early now unless the first 48K was all towing in the mountains), try to find Castrol DexronVI. Told by folks in the biz that it's as good as it gets. Another note....Anything that's a 'universal' trans fluid is junk.
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#9 GMC Denali 2006

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Posted 01 July 2010 - 12:20 PM

AMSOIL.

that is the best IMO.

I have it front to rear...
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2006 GMC Yukon Denali - Black
AMSOIL Front to Rear
AMSOIL Air Filter
Airaid Modular Intake Tube
9.5 x 11 Stack Plate Trans Cooler

#10 bcobb

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Posted 01 July 2010 - 12:25 PM

Thanks Guys!




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