Just brought my 17 in for my brake booster pump failing. I asked them to check the tranny again, for the 5th time now. Every service or recall I bring it in and complain. They always come back with " Its normal, No problem, Couldn't find a problem" this time I drove with a tranny tech and he heard the 3-1 clunk. They said they want to drop the pan. If there are no shavings, they want to change the valve body. If there is they will go further. Of course there were no shavings and changed the valve body. This is the kicker.... When she told me it was ready she flat out said they are not doing another thing on this tranny unless it's a major problem. So if it still clunks , I guess it's normal...! She said if the tech drives it like 25 miles, it happens 2 times, it's not a problem. I said ok so how many times would it happen in 25000 miles? Because that's how much I have on the truck. That's a lot. I'm done with GMC.... And to make it better, the person before me on line with the same counter person complained about the SAME thing I did.