Transfer case fluid brand - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #1  
Old 09-01-2008, 08:49 PM
StealthBird StealthBird is offline
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2003 GMC Envoy SLT
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Transfer case fluid brand

Hi folks, this is my first post!

I have a 2003 Envoy SLT, 70,000 miles, and just a few months ago I began to notice a slight shudder when turning. On rare occasions, when accelerating from a light, we also feel a slight shudder. After long drives, we sometimes get a mild "clunk" when coming to a stop, and turning into our driveway. We always leave the mode selector in AWD mode.

I pulled the plug to check the transfer case fluid level, and it's low. What fluid should I use top it off? The owner's manual gives a GM part number, but I was wondering if anything else from an auto parts store was compatible, or if I should just get the GM stuff.

Also, on rare occasions, I notice that we sometimes have no light on the trans mode selector. However, if I turn the key to "run" for a second or two before starting the car, I always get the light (again, we always leave it in AWD mode). This is just a family truckster, we don't use it for towing.

Thanks in advance!
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  #2  
Old 09-01-2008, 09:05 PM
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RayVoy RayVoy is offline
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Firstly, welcome to the site.

You may not be aware, driving in AWD will cost you 1 or 2 mpg. AWD engages front axle parts and the additional rolling resistance will cost mpg.

Now my , you have a 2003 with 70,000. I would not top up, you should change the fluid. And IMO, this is one place (the transmission is an other) where you should use the GM fluid.
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Old 09-01-2008, 09:27 PM
StealthBird StealthBird is offline
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Ray, thanks for the reply. I can change the transaxle fluid, I just wasn't sure if there was an off the shelf brand that was preferred over the GM fluid. I was actually going to change the trans fluid too, but the little driveline shudder was starting to concern me. We've driven this Envoy from Chicago to Florida several times, and we usually get 23-24 mpg on the highway. I run in 2WD on long highway jaunts, and I've always run Mobil 1 synthetic oil and a K&N air filter since it was new.
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Old 09-01-2008, 10:05 PM
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Quote:
Originally Posted by StealthBird View Post
Ray, thanks for the reply. I can change the transaxle fluid, I just wasn't sure if there was an off the shelf brand that was preferred over the GM fluid. I was actually going to change the trans fluid too, but the little driveline shudder was starting to concern me. We've driven this Envoy from Chicago to Florida several times, and we usually get 23-24 mpg on the highway. I run in 2WD on long highway jaunts, and I've always run Mobil 1 synthetic oil and a K&N air filter since it was new.
First of all, there is nothing wrong driving in AWD, the olds and buick trucks will only operate in AWD.
Do you notice the shudder in 2wd?
Our transfer case uses clutches to engage the front driveshaft. When in 2WD, the clutches are at rest, but when in AWD, the clutches are in a ready state. We have a number of reports of shuddering and complete relief when the fluid was changed. Other GM sites report the same result. So, it appears that changing the fluid will fix the shuddering.
I am sure other companies make a good fluid, I've never look for one. It's changed so infrequently, I usually go for the gm product.
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  #5  
Old 09-01-2008, 10:37 PM
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GM AutoTrak II is the only fluid that meets GM specs
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  #6  
Old 09-01-2008, 11:23 PM
WOOLUF1952 WOOLUF1952 is offline
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Welcome My dealer says not to use 4Auto on dry roads. I've had the front axle bind on full lock turns when in 4Auto. But maybe a fluid change would fix that.
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Old 09-02-2008, 01:02 AM
2001FZ1 2001FZ1 is offline
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Quote:
Originally Posted by LMMJ View Post
GM AutoTrak II is the only fluid that meets GM specs
Yep, GM won't release the license to copy the formula. Chevron, Amsoil, Mobil or any other manufacturer doesn't have anything. Kinda sucks too because the local dealer charges about $8 a quart....
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Old 09-02-2008, 02:09 AM
StealthBird StealthBird is offline
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2003 GMC Envoy SLT
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I'll be stopping by the dealer tomorrow. I might as well stop by the auto parts store and pick up some synthetic 75W-90 for the diff and front axle, and I'll change all the fluids. One last question though. How much fluid does the transfer case hold? Does the GM dealer sell Auto Trak II in quart or pint bottles?

You folks have been a great help!
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  #9  
Old 09-02-2008, 02:20 PM
StealthBird StealthBird is offline
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I found the transfer case fluid capacity in a Haynes Manual. It's 2 quarts, and yes, it's $8 a bottle (quart) from GM.
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  #10  
Old 09-24-2008, 07:25 PM
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pjaneiro pjaneiro is offline
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take pics if you change it, i'm still debating if it should be changed or not...

but i don't see any fill holes or draing holes, on either the trasnfert case or the front diff
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