Interesting. I have just taken my 2002 Envoy LT in the shop for basically the same sounding problem. It runs great, but when first started, usually in the morning, it really winds up before shifting into 2nd gear. All other gears seem fine. The dealership told me it was a clutch fan assembly problem ($800), others told me the transmission needed servicing. So, I had it serviced today, and we'll see what happens. And it doesn't do it all the time - just sometimes. Love my Envoy - hope this solves the problem. Thanks for posting your problems - it gives me an idea of what to look into should this fail.