The T55E1 3-inch gun motor carriage was a prototype vehicle developed by the Allied Machinery Manufacturing Company in 1943 for the US Army.

Cook Brothers had developed an unusual vehicle for desert conditions.

They then developed their design into a tank destroyer with two engines at the rear.

[citation needed] Power was from two Cadillac eight-cylinder water-cooled engines.

Production began in 1943, however by this time preference had shifted to tracked anti-tank vehicles, and the T55E1 was cancelled.