my silverado is very impressive but i have a few new vehicle problems. the transmission got stuck in second gear and needed solenoids at 3000 miles. the a/c keeps switching to outside air while driving no matter what and it is annoying to bring in exhaust fumes from other vehicles. the dealer says several complaints but no remedy as gm considers this normal. a letter to gm got me the same responce. this is a normal function of the vehicle according to gm. breathing other peoples exhaust in traffic can't be right..any ideas? a wind noise and rattle from the passenger windsheild post is very annoying at speeds over 65 mph. the noise is worse if it is windy outside. responces are welcomed :)