The 18-ton M4 high rate tractor series is developed and built by the Allis-Chalmers production company of Milwaukee , Wisconsin , between 1943 and 1945. The design ended up being in line with the T9 and T9E1 was indeed standardised as the moderate Tractor M4 which became the High Speed Tractor M4.Together utilising the M5 and M6 tall Speed Tractors they replaced the older commercial-type crawler tractors which mayn't meet up with the demands of a contemporary mechanized armed forces any longer. The high speed tractors could carry both crew and a straightforward option of ammo. Manufacturing were only for purchase in March 1943 and 5552 M4 tractors were put together until June 1945,plus 259 M 4A 1 tractors between June and August 1945. The 18-ton M4 advanced level tractor ended up being developed mainly as a prime mover the 155mm gun? and 8-inch and 240mm howitzers.
