Re: Dryer Cords
Yes, a three wire cord be changed out on an old dryer to a four wire, if a four wire circuit is available for the four wire receptacle to be wired into. The permanent building wiring should be done by a qualified person such as an electrical contractor.
The old dryer cord must be removed, the ground to neutral strap removed and discarded, and a new four wire cord installed. Again, this work should be done by a qualified person. I would think an appliance repairman would be a qualified person.