can this substitute for Automatic Transfer Case Fluid (GM Part No. 12378396)

auto trak 2 is slicker. It came about because the clutches in the transfer case were grabbing & causing a chatter. I've never heard of anyone having a problem using the auto trak 2 fluid instead of the auto trak fluid. I hope that helps you.

Is all ac delco auto track 2 fluid the same this part number doesn’t match my owners Manual ?

This is the correct fluid to use if and only if you have “full time” or automatic ALL WHEEL drive. It is NOT for four wheel drive, which mechanically is a totally different system, even though the result is similar- getting up a snow covered hill. I used this in my 2000 Olds Bravada. Fluid I drained looked dirtier, but the same blue. I believe that GM changed the part number, or updated the old fluid about 12 or 15 years ago. Like you, I did extensive online research before proving to myself that This Is the correct fluid to use for “automatic” All wheel drive before buying it.

Will this work in a 2007.5 lmm duramax?

It should work in the transfer case but I'd call the dealer parts department to be sure. My truck is a 1500. The transfer case in your Duramax may be a different unit requiring a different fluid.

Is this for the 2003 Silverado with 4 wheel buttons?

I used it in a 2004 Avalanche 1500 with push button 4WD and it made the service 4wd light stop. I decided to spend the extra to get this blue AC Delco fluid instead of a different brand the local part store offers

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⚙️ Keep your 4WD running cooler, longer — don’t let your transfer case miss a beat!

33 8 OZ CONVENIENT SIZE - Perfect volume for a complete fluid change, ensuring optimal transfer case health.
TRUSTED AC DELCO QUALITY - Backed by a leading OEM brand known for reliability and performance.
HIGH TEMPERATURE DURABILITY - Designed to withstand prolonged high-heat conditions without breaking down.
SUPERIOR OXIDATION RESISTANCE - Keeps your transfer case fluid fresh and effective longer, reducing maintenance frequency.
ENGINEERED FOR GM 4 WD TRANSFER CASES - Precision-formulated to meet GM’s exacting standards for seamless drivetrain performance.

ACDelco 10-4017 Auto-Trak II Transfer Case Fluid is a premium 33.8 oz lubricant specifically approved for GM automatic four-wheel-drive vehicles. It offers enhanced oxidation resistance and exceptional durability under high-temperature conditions, ensuring long-lasting protection and optimal transfer case performance.

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Manufacturer	ACDelco
Brand	ACDelco (エーシーデルコ)
Model	Transfer Case
Product Dimensions	22.35 x 12.19 x 6.35 cm; 890 g
Item model number	10-4017
Is Discontinued By Manufacturer	No
Exterior	____
OEM Part Number	88900402
Item Dimensions L x W x H	22.4 x 12.2 x 6.4 cm
Item Weight	890 g

ACDelco 10-4017 Auto-Trak II Transfer Case Fluid - 33.8 oz

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