DO NOT give in until they make the fix that YOU want. I spent the better part of three days working over a "customer service" rep in order to get what I wanted. Rest assured, it was far more than what they "offered" initially. The simple argument about an ext warranty is the desire to not be stranded one day when the known problem suddenly gets bigger

If you are the original owner of the truck and better yet if it isn't your first GM truck, you might be surprised what they will do if you make enough of a stink. Not how it SHOULD be but, that is the road they force you to go down.