Ok, I am switching my new silverado 1500 over to synthetics, amsoil to be exact.
I put 5w-30 in the engine, 80 weight in the front and 140 weight in the rear, but I am a little confused about eh transfer case.

Do I just use atf, or is there a special oil for this. I have a z71 with the auto 4 weel drive option.

Thanks

 

don't use anything else besides the "smurf" fluid. GM specific...it's blue. IMO. Viscous clutches.

 

 

Thats what I suspected, thanks for the input.

 

What rear does your vehicle have? Mine calls for 75w90 synthetic from the factory, and my front diff originally had 80w90 conventional gear oil which I also switched to 75w90 synthetic.

And yes sir on the autotrak t-case fluid, so far the only place I know to get it is at the dealer...it's bucks but cheaper than rebuilding or replacing the transfer case