hi, i have a '98 dodge neon. when i drive above 30 mph, it makes a low, rumbly-grindy sound. the sound worsens when i turn left but goes completely away when i turn right. it also doesn't do anything when i drive backwards. my stepdad thinks it might be the transmission, and we've already replaced the cv shafts and it didn't help. please, if you know anything about this, PLEASE HELP!