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In page ZSU-37:

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The vehicle could cross 0.67 m high vertical obstacles, 2 m wide trenches, ford 0.9 m deep water obstacles and climb 25° gradients. Transmission and undercarriage were identical to those of the SU-76M SPG. The engine was also the same but forced from 140 hp on SU-76M to 160 hp - a GAZ-203 which consisted of two tandem GAZ-202 6-cylinder row liquid-cooled gasoline engines, each producing 80 hp (63 kWt) at 3600 rpm.[1][3]