After creating the relatively cheap and simple GMC M3 tank destroyer on the chassis of a halftrack, the Americans took the next logical step. They replaced the 75 mm M1897A4 field gun with a purpose made anti-tank weapon, the 57 mm M1 gun. This created a tank destroyer called GMC T48.
The GMC T12 tank destroyer was designed in the summer of 1941 and then standardized as the GMC M3. This was a successful combination of two existing designs: the M3 halftrack APC and 75 mm M1897A4 gun. This tank destroyer was an improvisation, but it showed how a mobile anti-tank weapon could be created. All that was left was to adapt it to carry a more appropriate anti-tank weapon. The choice was easy to make.
|Prototype of the GMC T48.
|Same vehicle as seen from above.
|Dimensional drawings of the GMC T48.
|Gun mount of the GMC T48.
|Front of the fighting compartment.
|Rear of the fighting compartment showing fuel tanks and an ammunition rack.
|SU-57 from the 4th Independent Motorcycle Regiment of the 6th Tank Army, 2nd Ukrainian Front. Iași-Chișinău Operation, August 1944.
|Vehicles of the 4th Independent Motorcycle Regiment with a SU-57 SPG during the Iași-Chișinău Operation, August 1944.
|SU-57 of the 4th Independent Motorcycle Regiment in Bucharest.
|A captured SU-57.
|This poor quality photo presumably taken in March of 1945 is the only known photograph of the SU-57 from the Polish 7th battalion.