The Sherman tank was the principal US and Allied tank of World War II with more Shermans manufactured than all German tanks combined. Not only were large numbers manufactured, but there was a very wide range of variants powered by different types of engines, manufactured with different types of hulls, turrets and other details. As a result, a M4A1 tank from the Tunisian campaign in 1942 had nothing in common with a M4A3E8 tank from the 1945 campaign...