It doesnt have a tag on it like the one in my old Z71. The only markings I could find on it is this

It looks really freakin beefy like the one in my Dmax. This is in a 2007 GMT900 vortecmax with the electric shift tcase. Trying to make sure I put the right fluid in it when I do the fluid change.

 

Looks like Dex 6 or Auto-Trak II. Check your N codes on the RPO sticker.

 

NQH is what I've got. Wonder what the difference between my tcase and the normal autotrac tcase is...

 

Not sure cody, but does it have " Auto 4x4" button?

If so you need autotrac fluid, which you could verify by sticking your pinky in the top plug hole and seeing if the fluid is blue.

If its just a 2hi, 4hi,and 4low push button dex 3 or dex 6 is what you need.

I just drained and filled the Tcase in my dmax with Dex3, took out the speed sensor and put about 3 qts in, you can only get 2 qts in thru the top plug fill hole. this is how Eric Merchant told me to do it.

 

NQH uses Dex 6, not Auto-Trak II.