I have a stock auto 03 gt. When accelerating from a dead stop, car sounds real smooth all the way through to about 2000 rpm but when it shifts through the gear and rpms drop to about 1500, when i then accelerate the it sounds like the belts sound pretty sh****. Im just new to newer stangs and unsure if this is common. Is this just due to accelerating from the lower rpms in a higher gear or what? Could I need new belts? or is this normal and just thinking about it too much?