Does anyone know where I can buy the 4WD Actuator? I went to Advanced Atuo and AutoZone and neither had it and said they wouldn't be able to get it. So I need help. Thanks in advance.

The dealer or a local parts place that gets ACDelco parts.

Thanks. I am going to check with the dealer tomorrow and see how much that part is.

Both Autozone and Advanced have this part, or can get it in 1-2 days, for about $50. It's a Dorman part #. I'll post the # later. The problem is that the idiots at the parts stores don't know what there doing.

so did anyone ever find the part number because its snowing out here and it sucks being stuck in my own driveway.

Dorman #600-102 (often for search skip the "-" or 600102) or GM #25031740.
But make sure that's it cause would suspect the 3 port vac switch on the transfer case or a rotted out vac line first.

NAPA also has this part and is usually better then the autozone type places.

it sholdnt be the vacuum i had that replaced and i know it's on right. the actuator has a tear in it so i know it's the cause of my problem. ill try NAPA because AAP and AZ say they cant get it from their factory anymore or some other excuse. thanks.