6.0 wasnt available that early. 6.0 didnt show up till GM started offering the VortecMax engine.
Trans-cooler is a 102108430128402384% must to have when towing anything...hell, if you drive more then a grandma would, you should. Heat will destroy your trans. All the filters in the world arent going to do **** to keep your trans from roasting in its own fluids.
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2/20/2013: They Day the ****s Stopped
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