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I asked the guy at the chevy dealer he has no idea. Then I asked the guy in the parts department about if I had the heavy duty tow package. He goes "do you have a hitch on the back" yes I do "he goes well then you have the tow package" haha. So I dunno if I have it. But I'll read the manual.
"Without a problem"Stock I towed about 6000lbs closed trailer with a track car about 200mi oneway without a problem. But thats my NBS 2wd 5.3L 3.73 gears Suburban.
If your towing something heavy all the time get a trans cooler.