Transfer Case Internal Failure - 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 5.3L V8 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems

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  #1  
Old 10-28-2008, 12:14 AM
gibson5 gibson5 is offline
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Transfer Case Internal Failure

Back in 2005 I was a service manager at a Chevrolet dealership. I remember seeing Trailblazers come in with transfer cases that had failed due to internal bearing/fork failure. We thought the bearing was way to small at the dealership to handle the load. Some of the cases had holes in them where the bearing failed and metal debris broke through the case. The inside of the case looked like metal soup. At that time Chevrolet didn't have a fix for the problem. I saw at least 5 to 10 of these during my tenure as service manager.

I own a 2005 Trailerblazer that my wife drives. This very same problem happened to her this last week. I believe the transfer case also took out the front end but and not sure since the vehicle is currently at a Chevrolet for diagnosis.

I have been told there is now an update transfer case that addresses the bearing/fork problem. Of course the vehicle is out of warranty now.

My question is: how many of you out there have experienced this type of problem? Did Chevrolet do anything about it? You help would be appreciated.
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Old 10-28-2008, 12:41 AM
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AznRocka AznRocka is offline
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Happened to mine about 10K miles ago. Was fixed under the extended warranty.
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  #3  
Old 10-28-2008, 07:52 AM
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I've never heard of the t-case grenading like that

Was the transfer case engaged when it happened? or just in 2WD? Was it engaged on dry pavement?
I've put mine thru its paces in the snow but the wheels always spin so I doubt anything bad can happen to it.
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Old 10-28-2008, 11:47 AM
gibson5 gibson5 is offline
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Transfer Case Problems on Trailblazer

The problem seems to happen when A4WD is selected and you are driving on slick roads (i.e. ice) and you hit a dry spot or visa versa. The bearing in the transfer case takes the "shock" and can't handle the load.
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Old 10-28-2008, 01:55 PM
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Quote:
Originally Posted by gibson5 View Post
The problem seems to happen when A4WD is selected and you are driving on slick roads (i.e. ice) and you hit a dry spot or visa versa. The bearing in the transfer case takes the "shock" and can't handle the load.
Yeah... I usually try and stay out of A4WD unless the road is VERY patchy... When I'm in it (and I tell the wife, when she's in it), to make sure to get on the gas VERY slowly, so that when the front end grabs, it's not a harsh "bang" like it can be if you get in it like normal, and the rear end takes off too quickly... Just seemed like the kind of thing that you wouldn't want to do too often...

Mike
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  #6  
Old 10-28-2008, 03:30 PM
gibson5 gibson5 is offline
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Trailblazer Transfer Case Problem

From what I have seen as a service manager and what others who are still in the dealership service business tell me, this issue should have warranted a recall. GM has made a modification to the transfer case and "update" the internal bearing/fork. When you call the parts department they will tell you they have the updated transfer case.
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Old 10-28-2008, 04:44 PM
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Originally Posted by gibson5 View Post
From what I have seen as a service manager and what others who are still in the dealership service business tell me, this issue should have warranted a recall. GM has made a modification to the transfer case and "update" the internal bearing/fork. When you call the parts department they will tell you they have the updated transfer case.
Ah... what year did that start? I've got an '07, so I suspect if there's an updated TCase, I've got it from the factory?

Thanks,
Mike
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Old 10-28-2008, 05:39 PM
gibson5 gibson5 is offline
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Trailblazer with Transfer Case Problem

I am not sure. I worked as the service manager at a Chevrolet dealership in 2004-2005. My Trailblazer is a 2004. Perhaps the best way to get an answer is to call a Chevrolet dealership and ask someone in their parts deparment when the updated transfer case came out.

I doubt you would have heard of this problem in warmer climates since the A4WD wouldn't be used as much. The problem would rear it's ugly head in colder climates where the 4WD would be used more. I live in Alaska. We have 2 Chevrolet dealerships and both of their parts departments carry the updated transfer case. Both dealerships are aware of the problem.
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Old 10-30-2008, 11:08 AM
TB-Dan TB-Dan is offline
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Symptoms?

I have a 2005 TB that is starting to do strange things when I put it in A4WD. What were the symptoms that the vehicle had prior to the transfer case failure?

I'm getting a pulsating in the front end, it almost feels like I'm driving on a rough road. If I switch it to 2WD or 4WD it stops.

Thanks,
Dan
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Old 11-01-2008, 11:56 PM
gibson5 gibson5 is offline
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Chevry Trailblazer with transfer case problems

I wasn't driving the vehicle when all of this happened. My wife was. She said if felt like she hit a bump in the road. She looked back and didn't see a bump.

I have been told the A4WD is allows the vehicle to operate in 2WD until it senses slippage. Then it engages to 4WD. This can happen mulitiple times depending on road conditions. The engaging and disengaging is accomplished by a fork and bearing internally. If I am wrong, please somebody correct me.
The bearing is very small and can't handle the shock. I have seen this bearing and it amazes me how it could handle any shock.

I am not sure if this is related to what you are sensing or not.
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