Editing M26 Pershing (section)

==== T20 ====
{{main|T20 medium tank}}
The '''T20''' was designed to have a more compact hull than the M4. The [[Ford GAA engine|Ford GAN]] V-8, a lower silhouette version of the GAA engine used in later variants of the M4, had become available. The engine had originally been an effort by Ford to produce a V-12 liquid-cooled aircraft engine patterned after the [[Rolls-Royce Merlin]], but failed to earn any aircraft orders and so was adapted as a V-8 for use in tanks; use of this lower profile engine together with the choice of a rear transmission and rear sprocket drive layout made it possible to lower the hull silhouette and eliminate the side sponsons.{{sfn|Hunnicutt|1996|p=49-50}}

The T20 was fitted with the new [[76 mm gun M1|76 mm M1A1 gun]], the [[3-inch gun M1918|3-inch M7]] was considered too heavy<ref>Chamberlain, Gander – Anti-Tank Weapons, p 49.</ref> at about {{cvt|1990|lb}}.{{sfn|Hunnicutt|1988|p=193, 194, 213}} New stronger steels <ref>Hunnicutt, R. P. – Armored Car: A History of American Wheeled Combat Vehicles., p 41</ref> were used to create a weapon weighing about 1,200&nbsp;lb (540&nbsp;kg).<ref>Hunnicutt, R. P. – Stuart: A History of the American Light Tank, p 295-296.</ref> The 3&nbsp;inch front hull armor was {{convert|.5|in|mm|abbr=on}} thicker than the {{convert|63|mm|in|abbr=on}} front armor of the M4. The [[glacis]] plate slope was similar at 46°. The T20's overall weight was approximately the same as the M4.{{sfn|Hunnicutt|1996|p=50, 104}}{{sfn|Zaloga|2008b|p=22}}

The T20 used an early version of the [[horizontal volute spring suspension]] (HVSS), another improvement compared to the less robust [[vertical volute spring suspension]] (VVSS) of the early versions of the M4.{{sfn|Hunnicutt|1996|p=50}} Later prototypes of the M26 tested a [[torsion bar suspension]], which became the standard for future U.S. tank suspension systems.