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Drivetrain - 2001 - 2010 Discuss front and rear axle, transfer case, brakes, etc. Transmission questions belong in the appropriate transmission forum below. First through fourth generation...

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Old 02-04-2020, 03:49 PM   #11 (permalink)
davester
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Quote:
Originally Posted by Babin Farms View Post
2 qts of Genuine GM Fluid 88900402 Auto Trak II Transfer Case Fluid

Are you sure this is the right fluid? I don't think the O.P. has an transfer case with the "auto" option. Most likely it should just need a DexIII fluid (at least, that's what GM specced for '06).

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Old 02-04-2020, 07:48 PM   #12 (permalink)
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Bueler! It’s a 2007 Chevy Silverado duramax 6.6 classic work truck with a Allison automatic transmission please let me know

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Old 02-04-2020, 08:18 PM   #13 (permalink)
heymccall
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In my experience, the autotrac fluid won't harm it, or change it's operating characteristics, but, Dexron III is the preferred oil.
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Old 02-05-2020, 07:49 PM   #14 (permalink)
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Quote:
Originally Posted by Babin Farms View Post
2 qts of Genuine GM Fluid 88900402 Auto Trak II Transfer Case Fluid
Duramax does not use autotrac fluid.
DEX III, DEX VI, Mobil Delvac Synthetic or Transynd, but not the auto trac. That is for the AWD.
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Old 02-05-2020, 09:00 PM   #15 (permalink)
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Just went to Napa and they said auto trac II
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Old 02-06-2020, 03:22 AM   #16 (permalink)
davester
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Seriously, unless you have an electric shifting transfer case, and one of the buttons has "Auto" on it, you don't need Autotrac fluid. It probably will work, but

1) it's more expensive than the fluid you need
2) it's not the fluid you need


If you need confirmation, your owners manual will say what fluid to use. If you don't have the paper version, you can download the pdf of it free from gm's web site.
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Old 02-06-2020, 09:28 AM   #17 (permalink)
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Quote:
Originally Posted by Dondiesel View Post
Just went to Napa and they said auto trac II
That’s the wrong oil for your transfer case.

Here we go again on the confusion on what transfer case we have in our trucks.
We have the (Manual Transfer Case) After 20 years on here we would think to get this right.

2006 Diesel Supplement Manual Page 6-16

Pickup Models: Manual Transfer Case
DEXRONŽ-III Automatic Transmission Fluid. Look for “Approved for the H-Specification” on the label.
That does take AUTO-TRAK II Fluid

I use 5w-30 Mobile 1

To confuse more people again WE DO NOT HAVE THE (Automatic Transfer Case) Trucks like Tahoe etc..
AUTO-TRAK II Fluid.
(GM Part No. U.S. 12378508, in Canada 10953626).

Please correct me if I’m wrong. No hard feelings.

Last edited by Rvn4me; 02-06-2020 at 09:40 AM.
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Old 02-06-2020, 10:08 AM   #18 (permalink)
Babin Farms
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My bad if I misinformed anyone. When I think of manual I think of pulling a lever, not pushing a button. Question, whats special about the AUTO-TRAK II Fluid? It's to the point where you can't keep track of what fluid goes where anymore.
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Old 02-06-2020, 11:53 AM   #19 (permalink)
heymccall
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Autotrac fluid has an additive similar to a limited slip additive, but has an atf base, as opposed to a gear oil base.
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Old 02-07-2020, 12:15 AM   #20 (permalink)
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Quote:
Originally Posted by Babin Farms View Post
2 qts of Genuine GM Fluid 88900402 Auto Trak II Transfer Case Fluid

Do NOT use the auto trac II fluid.
That is for the 1500 series with the auto 4wd button, those cases have clutches inside where the 2500 does NOT.

And this reminds me, I need to change the fluid in my case.....

I have been using 5w-30 synthetic motor oil with some PTFE additive in mine since 2006, it runs quieter, and besides, it is nothing but chain and gears in the case....

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Last edited by Tolliwacker; 02-07-2020 at 12:19 AM.
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