Transfer case fluid change

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Thread: Transfer case fluid change

  1. #1
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    Transfer case fluid change

    I am preparing to do a fluid change on my 04 Silverado. I plan on doing the tranny, both diffs and the transfer case. I am going to use synthetic oils and lubes but the manufacturer has no recommendation for my transfer case (NVG 246-NP8). I have the push button 4WD. They list a GM part number (12378508) for this transfer case. I tried looking the part number up online but got no definitive answers. Any thoughts on this? I was going to see if there was a tag on the transfer case to see what it says for lube. Thanks.

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    1.4 Liter Turbocharged ECOTEC taber.gmc's Avatar
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    Re: Transfer case fluid change

    I had the same problem with my 2000 GMC Sierra. The manual had no recommendations for the transfer case. I called a dealership, and they told me to use Dexron III (Transmission Fluid). On the other hand, our transfer case on the Duramax has to use super expensive GM Transfer Case lube.
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    GMI Staff Member Premium Member shadams's Avatar
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    Re: Transfer case fluid change

    Can vary depending on type of t/case. If you want to PM me the last 8 of your VIN I can tell you which. Some use transmission fluid, some use what GM calls Autotrac fluid, and some use manual transmission/transfer case fluid.

    DOH! See you listed you case, hold on.

    OK, the fluid part # you listed is for Autotrak-II fluid which goes in that t/case. Is that the info you wanted?
    Last edited by shadams; 03-14-2007 at 02:41 PM.
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    Re: Transfer case fluid change

    shadams here is the last 8 of my vin just in case my assumptions were wrong: 4Z273410

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    Re: Transfer case fluid change

    The blue transfer case fluid can be sourced at GM, you should need 2qt, and it isn't expensive.

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    Re: Transfer case fluid change

    Thanks for the info. Now that I have that cleared up how do I tell which ring gear I have in the rear end? My truck has 3.73 ratio. And how do I tell which tranny pan i have on my truck deep or shallow and if it is a reusable gasket?
    Last edited by weo38; 03-15-2007 at 08:45 AM.

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    Re: Transfer case fluid change

    You have the 8.6" rear diff with Posi & 3.73 ratio...both diffs use 75w90 synthetic...

    Your transmission is a deep pan...oe# for the transmission service kit is# 24208576.

    You will need two liters of the Auto Trac fluid for the tcase....#12378508
    Last edited by GMCSonoma; 03-15-2007 at 08:49 AM.

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    Re: Transfer case fluid change

    In my "2001 Diesel Supplement" manual it says for "manual transfer case" you should use Dexron III. For an "automatic transfer case" use Auto-Trak II. I was confused at first then after a couple of days of research I found out that the meaning of automatic trasfer case was if you have a 'Auto 4X4" button in your truck. In which I do not recall ever seeing one in a full size truck. I have however had one in my wife's 2001 ZR2 Blazer. Weather this is differnt because my truck is a diesel, I have no idea, but manual is manual and automatic is automatic.
    Last edited by Headymusk; 04-17-2008 at 08:19 AM.

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    Re: Transfer case fluid change

    I have one in my 2004 silverado 2500 hd.....so there are a few out there.

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    Re: Transfer case fluid change

    Im brand new here but how do I obtain a detailed rpo list mainly i need to know what tranny, diffs, and tcase I have so I know what fluids and addatives to buy just bought a '06 silverado w/66000 miles and I want to change all fluids hopefully to synthetic

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