The M4A1 (75) W is a unique Sherman variant, retrofitted using parts from different models of M4 Shermans. In this case, these were six Sherman tanks with the cast hull of the M4A1 (76) W (distinguished by the travel lock of the original 76 mm M1 gun) and its iconic D82081 full-sized mantlet turret, but armed only with the less powerful 75 mm M3 cannon. These tanks were part of the post-Civil War order of supplementary tanks for the ROCA from Great Britain, delivered in late 1949 after the loss of most of mainland China. As the ROCA later adopted the M18 GMC as their main tank, these Shermans were soon retired in 1952.

Introduced in Update 1.91 "Night Vision", the Taiwanese M4A1 (75) W combines the hull and turret of the M4A1 (76) W with the earlier 75 mm gun, which means it has a more armoured turret than other Shermans at the same BR, but the M4A1 hull presents large weak spots. This, combined with its good gun depression, makes it very effective in a hull-down position.