Question about 2003 Chevrolet TrailBlazer

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2003 Chevy Trailblazer: Transfer Case

2003 Chevy Trailblazer: I have a burning smell coming from my car after running for awhile. About a month ago I was driving in 4WDHI for about 40 minutes on highway at about 60-70mph (snow conditions). At bottom of off ramp I noticed smoke and a burining smell. I turned off 4wd and have not seen smoke since but I do get smell and have notice a leak on driver side front drive shaft as it enters transfer case.

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  • patrick_cron Feb 03, 2010

    great...I was reading about changing the Tranfer Case fluid but can you give me a little more infor on how to do it of have any diagram of where the fill and drain plug is. I have a fluid pump that I use for my jet ski to change that oil so it appears I will have to use that to get the new oiol into the transfer case.

    Also, I have read mixed messages on high speed 4WD...are you saying you are not supposed to? I thought 4WD-HI was the same as 2wd-HI

  • patrick_cron Feb 03, 2010

    Very Helpful



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This transfer case uses a wet clutch. What has happened is that the high speed travel in 4HI has burned the clutch in the transfer case a bit. No way of knowing how much without a complete tear down.

I would recommend having the fluid serviced as it is most likely laden with the burnt clutch material. I am sure this will get rid of most of the odor you are detecting. It is also likely because of the leak you indicated the transfer case is low on fluid which will cause the odor to be stronger. Running these low can have catastrophic effects.

As for the front seal leak, this could have been caused by simply getting the transfer case too hot. Replacing the seal is the remedy for this leak. With the drive shaft removed the source of the leak should be obvious.

Posted on Feb 02, 2010

  • Thomas Neubauer
    Thomas Neubauer Feb 09, 2010

    Sorry I did not get back to you swiftly, had a heck of a time finding the link to do so.

    1. When running the vehicle in 4HI it is not the same as 2 HI. I think if you check your owners manual they suggest speeds no faster than 30mph in 4 HI. Also makes a big difference if the surface is dry.

    2.The drain plug and the check plug are located on the back of the transfer case. They should be either a 3/8 drive square or a 24mm bolt. Do remove the top one (check plug) first and have your drain pan handy. Then remove the lower one and the fluid should drain. Replace the drain plug and fill until fluid is level with the check plug.

    Hope this was of help please feel free to ask any other questions regarding this.



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