My july 2007 build 4.8 has not had any major issues. I have 47.5k miles on so far. Will be getting rid of it soon though as I do not want to see out of warrant repair bills(lease). Transmission could and should be smoother, but I drive heavy footed anyways so it matters little to me. I love this car and my biggest problem is the temptation to buy the same exact truck again, which I normally avoid, for sake of change.

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2011 50i BS/Black Nevada
(gone) 2007 4.8i AW/Tobacco