The T29 was based upon a lengthened version of the T26E3 chassis and featured heavier armor; an upgraded 12-cylinder Ford GAC engine producing 750 hp at 2,800rpm, which gave it a power-to-weight ratio of 11.68 hp/t; more comfortable controls for the driver;[3] and a massive new turret incorporating the high-velocity 105 mm gun T5E1.

;[4] while the T29E3 variant featured a coincidence rangefinder projecting from both sides of the turret, distinctively resembling "ears".

It could cross a trench 2.4 m (94 in) wide, wade in water 1.2 m (47 in) deep, climb a 1 m (39 in) step, and could handle a 30-degree slope.

Suspension consisted of 8 double road wheels with rubber tires, 7 return roller on each side, and had the drive sprockets in the rear.

The procurement of 1,200 T29s was proposed on 1 March 1945, and revised to 1,152 on 12 April 1945, but by shortly after the end of World War II, only one T29 had been produced, with a second partially completed.