This vehicle was an attempt to place the powerful American 90mm anti-aircraft gun on a self propelled chassis for use as a tank killer. Shown above are the T53 and to the right, the modified T53E1. 500 vehicles were to have been produced, but the order was cancelled. Questions arrose about poor mobility, instability, engine cooling, crew protection, excessive height and too little weight to handle the recoil of the gun. The entire project was terminated in the Spring of 1944.

T53 Sherman SP 90mm tank killer

40mm guns were among the most widely used by the United States between 1940 and 1946. The reason for their popularity was due to weapon weight and the delivery power of their shot. Shown above is a Bofors gun on a modified M3 tank chassis. This unaccepted for production model is dated at 1942 and the picture was taken at Aberdeen Proving Ground. The fire control system included a T10 computer which was a gear operated device which provided data for gun tracking.

T36 Twin 40mm AA

M3 light tanks of US 9th Marine Defense Battalion near the base of Bibilo Hill, Munda, New Georgia, Aug 1943