The corvette servo provides more apply pressure to the 1-2 and 2-3 bands. For $15 it's worth a shot to put one in and try. It might prolong the life and save you from a rebuild for a little while. In spite of govtech4's opinion, the corvette servo is a very nice mod to any 4L60 or 700R transmission.
I had this message on my 2008. Turned out to be an impact sensor (common failure). I ordered two from Rock Auto, changed both in about 15 minutes, and no more service air bag message!
I had a '99 with 3 doors, always wished it had the 4th door.I have a 4 door 2008 extended cab now. I like the suicide door configuration, helps if you want to get something large in the back seat area. And the NNBS doors open all the way flat.
The light sensor on the dash also serves as the HVAC sunlight sensor. Also unplugging it will make it think it's night and keep the headlights on. It's designed to default to headlights on if the sensor fails.
Check out the Airaid MIT. The truck already has a CAI, you just need the tube and a lower restriction filter to get the same benefits as a $300 CAI. Any HP or MPG gains are marginal at best though. If you check the data, most CAI "performance improvements" happen at 5,000 rpm or above.
Replaced mine today with AC-Delco 214-2149 purchased from Rock Auto, $21 shipped priority mail. CEL light went out first time I started it after. Simple replacement, no more topping off for me though!