So I’m installing my new transmission into my Sierra 1500 and I have tubes coming off the Transfer case. Are they over flows or vent tubes? My buddy pulled em and now idk where they go.

 

Vent tubes. Should be one for the tyranny and one for the transfer case. I'd route them up high to keep as much water or dirt out of the units. Should be some end cap vents so that nothing goes directly into your power-train.