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

Brand	ACDelco
Package Information	Bottle
Liquid Volume	1 Litres
Item Weight	907 g
Recommended Uses For Product	Automotive
Specific Uses For Product	Prevent Corrosion
Item Form	Oil
Global Trade Identification Number	00707773844021
Net Quantity	999.58 millilitre
UPC	707773844021
Country of Origin	USA
Item model number	10-4017
Product Dimensions	22.35 x 12.19 x 6.35 cm; 907.18 g
ASIN	B002H8U3KK

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

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