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2500HD/3500 HD Trucks & Drivetrain Discussion Forum for the 2001 & newer 2500HD/3500 Trucks, Transmissions & Drivetrain

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  #1  
Old 06-02-2005, 12:17 PM
William Lee Gingerich William Lee Gingerich is offline
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Question

My owners manual says to put Auto trac fluid from GM in my transfer case on my 2500HD '05 GMC. It is an electric transfer case. I thot only the half ton trucks with auto 4x4 required that. Any help would be appreciated!
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Old 06-02-2005, 12:41 PM
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More Power More Power is offline
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Use 1.9 quarts of Dextron III equiv ATF fluid.

MP
  #3  
Old 06-02-2005, 01:11 PM
DmaxMaverick DmaxMaverick is offline
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The Autotrac II fluid is ONLY for 1500/2500 trucks/SUVs with Autotrac (auto 4x4). The 2500HD and up DO NOT have Autotrac as an option. As MP said, Dexron III (or IV or V) is what you need.
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Old 06-11-2005, 09:14 AM
William Lee Gingerich William Lee Gingerich is offline
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That was my understanding also. Just thot I would make sure. I was on a trip so that is why I didnt reply right away. Thanks a lot !!!
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Old 06-11-2005, 10:26 AM
Sheldon Kuhn
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Glad I read this. Dealer sold me Autotrac as the fluid to use ;-( What do you guys recommend for 1st time change. Miles, 4X4 use? I haven't changed it yet.
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Old 06-11-2005, 11:06 AM
DmaxMaverick DmaxMaverick is offline
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Quote:
Originally posted by Slik:
Glad I read this. Dealer sold me Autotrac as the fluid to use ;-( What do you guys recommend for 1st time change. Miles, 4X4 use? I haven't changed it yet.
Dexron III (or later IV, or V) ATF. There are several excellent synthetics available, which is what I recommend, especially if towing. Transynd is supposed to be the premium fluid. I use Amsoil Torquedrive, which is claimed to be of the same/better rating as Transynd. I would use Transynd, but I despise Castrol, as a company.
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Old 06-12-2005, 04:10 AM
Sheldon Kuhn
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Thanks, I think I will go with Transynd.
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Old 10-05-2005, 03:00 PM
Tray B Tray B is offline
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Just got my truck fluids changeded and he used auto-trak in my transfer case. I don't have teh auto button on my 03 Dmax 4x4.

Will this damage my transfer case? What is the difference in the fluids?
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  #9  
Old 10-05-2005, 08:56 PM
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Quote:
Originally posted by Tray B:
Just got my truck fluids changeded and he used auto-trak in my transfer case. I don't have teh auto button on my 03 Dmax 4x4.

Will this damage my transfer case? What is the difference in the fluids?
AutoTrac t-case is always driving front driveshaft, there is a clutch pack (9/10 disk)inside case that designed to absorb shock as front diff is engaged/disengaged at speed. AutoTrac fluid is designed as a limited slip type lube because of the clutch pack.

In your case use best synthetic you can find.
  #10  
Old 10-18-2005, 02:36 PM
Biodiesel6.6 Biodiesel6.6 is offline
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When I changed mine it had the green Auto-trac fluid in it. Almost 50k, the fluid looked good, I changed it anyway! [img]tongue.gif[/img] Good for another 50k
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