M-107

In 1956 the US Army made a requirement for a self-propelled artillery vehicle to be airborne. The contract was awarded to Pacific Car and Foundry which in 1958 introduced three different self-propelled vehicles using the same chassis. They were the 175mm T-235, the 203mm T-236 and the 155mm T-245, which was not accepted. This first T-235 vehicle had a gasoline engine, but it was quickly changed to a diesel engine that greatly increased the range. This vehicle, with the new diesel engine, was designated as T-235E1 and would be the one that would be mass-produced under the name M-107 Self Propelled Gun.

M-107 SPG gallery and more info