well, some details would help. if i see right from the photo, its Crankcase ventilation hose. could say for sure, if you tell me the where that hose comes, and where it goes.

but if it goes from Crankcase ventilation to airfilter assy, its "Crankcase ventilation, Sierra. part nro. V88BB 6K608 AA and Finish code is 1648802"

that is 2WD is it?