Officially named the M4A3(76)W HVSS; but generally known as the Easy Eight. At the end of August 1944; a new suspension was designed for the M4 series; allowing greater mobility as well as heavier armor. The result was a highly effective medium tank. The vehicle was mass-produced beginning in late March 1945; with a total of 4542 M4A3(76)W tanks with both suspension types manufactured.