| Crew | Driver |
| Weight | 31,500 lbs. |
| Height | 7 ft, 10 in. |
| Width | 8 ft, 1 in. |
| Length | 17 ft, 2 in. |
| Engine | Waukesha 145GZ 6 cyl. gasoline |
| Horsepower | 210hp |
| Road Speed | 35 mph |
| Range | 180 mi. |
M-4 High Speed Tractor at Hampton Roads, VA, 16 August 1943.
An M-4 High Speed Tractor of the Seventeenth Field Artillery, supporting the First Marine Division, stopped by a river near Chunchon, Korea, 1950.
The M4 18-ton High Speed Tractor was designed as a prime mover for towing large field artillery guns such as the 90mm Anti-Aircraft gun, the 155mm Long Tom, the 8in. Howitzer, or other heavy weapons (See the Towed Artillery Chart). In addition to moving the gun, the M-4 High Speed Tractor carried ammunition in cargo space racks. Ten men plus the driver could be carried. The M-4 HST was manufactured by Allis-Chalmers Mfg. Co. of Milwaukee, WI starting in 1942 and was in U.S. military service until approximately 1960.
The M-4 High Speed Tractor was equipped with air and electric brakes that would match any types of brakes on the towed load.
An anti-aircraft .50 cal. machine gun on a ring mount was accessed through a hatch above the crew compartment.
M-4 High Speed Tractor
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