The cartoon shows how the character, as the pleasant, friendly, and good-natured “Mr. Walker” who “wouldn’t hurt a fly nor step on an ant”, undergoes a change in personality to the crazy “Mr. Wheeler” when he gets behind the wheel of his yellow car. The car that Goofy drives is a yellow Lincoln-Zephyr convertible. Although not every detail is correct on the cartoon car in relation to the original, its deep, growling sound is unmistakable.
Disney Short From 1950 Portraying Driving Behavior Still Rings True Today