The M18 Hellcat was a tank destroyer used by the United States during World War II. It was designed to provide mobile firepower in support of infantry and armor units. The Hellcat was armed with a 76mm gun and had a top speed of 55 mph
From Wikipedia
The M18 Hellcat was a tank destroyer used by the United States Army in World War II and the Korean War. Despite being equipped with the same main gun as some variants of the much larger Sherman tank, the M18 attained a much higher top speed of up to 55 mph (89 km/h) by keeping armor to a minimum, and using the innovative Torqmatic automatic transmission.