Got it into the garage. Jacked it up and put it on jackstands. Still can not see where it is leaking from!
I work the next couple days so I will not be doing anything with it.
Thanks again for the replies! This is all new to me, as you can see by my signature I am a Jeep guy and really do not know my way around this engine.

 

Just wanted to thank everyone. Turned out it was the intake manifold gaskets. Replaced them and flushed out all that orange atifreeze crap and replaced it. I think that was the problem in the first place. To those still running the original anti freeze have it changed NOW!
When Ichanged the oil it more looked like chocolate milk. Went ahead and changed it and had my son drive it awhile and changed it again.
Thanks again for the ideas. I was ready to pull the transmission and change outthe rear freeze plugs, that it did not have. Yes I would have been more than a little upset!

 

glad you got it fixed.

I hihgly recommned you use theDexcool or an all makes all models brand antifreeze. The only time people have trouble witht eh DexCool is when they dont maintain the cooling system. the worst enemy is air, make sure you keep the system full, and replace the rad cap when you see debris collecting under it. GM has designed the cooling system around the Dexcool. Ithas different lubrication properties then the green stuff, and yes it does last 5 years or 150,000 miles.

As for the oil, its that way becuase your intake leaked anti-freeze into the oil.

 

I did notice that his radiator cap needs to be replaced. The truck only has 80,000 miles on it but is 8 years old. It still had the original antifreeze in it. My Brother in law was a GM mechanic and had told me a few years ago(when I had mine changed) to change it at 100,000 miles or every 3 years.