when u get ur vx lifted and have not yet changed the tires, does ujr TOD start acting up, cuz it works perfect but the TOD light turns on and off really fast like every 1 or 2 or 5 min's. its that normal?

also when i drive over 50 mph and i let go the gas and the rpms go under 2,000 rpms it makes this weird rattle and noise under the back of my VX, and when it drops past 50 mph it stops. What could this be or mean? Is ti normal for such weird change or it just means i need to get the VX tires re-alined?