my 99c5 auto seems to shift soft and alot. at cruising speeds around 45 -50 mph, and say getting ready to get onto the freeway it always seems to go into overdrive, feels like it noses over you gotta give it pretty good throttle to kick it down. on the other hand, it shifts very very hard on wot accel. is it okay to drive around town in 3rd instead of od. probably dumb question, my first auto since 1989. had a six speed z28 for 10.5 yrs and maybe just not used to this constant shifting of the auto. any help would be great. I love my c5, be sure wish I had got a stick!!!!! the seem to feel stronger.