A fighting army needs more than tanks and artillery. Fuel, ammunition, food and spare parts must reach the front every day. In the Second World War, the GMC CCKW became one of the trucks that made that movement possible.
The quiet workhorse of a mobile war
The Second World War placed an extraordinary burden on military transport. Mechanised forces could move farther and faster than previous armies, but their advance depended on an uninterrupted flow of supplies. A tank without fuel or ammunition was little use, however formidable it looked on paper.
The American GMC CCKW, a 2½-ton, three-axle, six-wheel-drive truck, was designed for precisely this unglamorous but essential task. Soldiers commonly called the GMC “Jimmy.” The broader nickname “Deuce and a Half” referred to the 2½-ton military truck class rather than to the CCKW alone. These distinctions matter because several manufacturers built trucks to broadly similar wartime requirements. [1][2]
From a requirement to a mass-produced vehicle
In 1939–40, the U.S. Army sought a standard tactical cargo truck with an off-road load rating of 2½ U.S. short tons. It needed all-weather mobility, dependable construction and a design that could support more than one military role. General Motors’ Yellow Truck and Coach division developed the CCKW from earlier truck designs and began series production in 1941. Manufacturing involved the Pontiac, Michigan, facilities and later the Chevrolet plant in St. Louis, Missouri. [2]
The designation CCKW is generally explained through the manufacturer’s classification for the design year, conventional cab, all-wheel drive and tandem rear axles. More important than the code itself was the resulting vehicle family: a platform that could be delivered in different body and chassis arrangements while sharing essential mechanical components. [2]
CCKW-352 and CCKW-353
Two central versions were the short-wheelbase CCKW-352 and the long-wheelbase CCKW-353. Both belonged to the same 6×6 truck family; the difference in wheelbase affected the body types and duties for which each chassis was suited. The familiar long cargo body is particularly associated with the CCKW-353. [2][4]
The cab also evolved. Early production trucks could be seen with enclosed steel cabs; later trucks commonly used simpler military-style cabs with canvas tops. Cargo bodies varied too, including arrangements made to reduce steel consumption during wartime. A period photograph showing a different cab or cargo bed therefore does not necessarily depict an entirely different truck family. [4]
This variety is worth remembering when comparing historical photographs with a scale model: one set of fittings, markings or body details cannot stand for every CCKW built between 1941 and 1945.
Engine and running gear
A defining mechanical feature of the CCKW was the GMC 270 petrol engine, a straight-six of approximately 4.4 litres. Tucson Military Vehicle Museum gives 104 hp for its reference vehicle, along with a maximum speed of 45 mph (about 72 km/h) and a range of 300 miles (about 480 km). Such specifications should be tied to the particular configuration cited, not applied indiscriminately to every wartime vehicle. [2]
A five-speed manual gearbox and 6×6 drivetrain helped the truck serve on rough roads and beyond them. But six-wheel drive was not a guarantee against mud, steep gradients, mechanical failure or heavy tyre wear. The hard experience of wartime supply convoys made the distinction painfully clear. [3][4]
The earlier ModofWar article distinguished between Chevrolet-style banjo and Timken split axle arrangements. That distinction is retained as a point for technical verification against the contemporary War Department maintenance manual, rather than presented here as a universal specification for every production batch. [5]
More than one type of cargo body
The conventional cargo truck is the best-known CCKW, and for good reason. A general-purpose body could carry stores or, with the folding seats provided on some trucks, troops. The platform also supported fuel and water tankers, maintenance and workshop vehicles, dump bodies and other specialised configurations. [2][4]
That flexibility mattered as much as the engine. Standardising vehicles and components made it easier to supply repair units, train drivers and keep transport formations operating over long distances. In a war fought across continents, the truck was not merely a delivery vehicle: it was part of the army’s operational infrastructure.
The Red Ball Express, August–November 1944
The CCKW is closely associated with the Red Ball Express, the vast road supply operation created after the Allied breakout from Normandy. By late summer 1944, Allied formations were advancing across France faster than damaged railways could support them. Supply depots remained far behind the spearheads, and the danger of fuel shortages was becoming acute.
Beginning 25 August 1944, Red Ball used controlled road routes and transport units to move fuel, ammunition and other essential materials forward. Trucks travelled along designated outward and return routes, operating under demanding schedules. The system continued until 16 November 1944. According to a U.S. Army Transportation Corps history, the operation transported 412,193 tons of supplies over its existence. That is the total for the transport operation, not the output of GMC trucks alone. [3]
The story also belongs to the men who drove and repaired those vehicles. Under the segregation of the U.S. military at the time, African American soldiers were assigned disproportionately to transport and service units. The Army history reports that roughly 73 percent of Motor Transport Service truck companies in the European Theater were African American units. This figure must not be misrepresented as an exact proportion of all Red Ball drivers or individual trucks. [3]
Drivers faced exhaustion, dangerous roads and punishing wear on vehicles. Mechanics worked to keep the convoys moving despite breakdowns and tire failures. These experiences explain the historical significance of the CCKW better than any single performance figure.
How many were built? Understanding the 810,000 claim
The original ModofWar article used 810,000 as a production figure in a discussion of wartime 2½-ton trucks. It should not be repeated as a figure for the GMC CCKW alone.
Tamiya refers to more than 800,000 vehicles when discussing the broader wartime 2½-ton 6×6 truck category. Museum figures for GMC production are lower and depend on precisely which variants are included. The National WWII Museum gives 562,750, while Tucson Military Vehicle Museum refers to more than 570,000. The treatment of variants and related vehicles, notably the amphibious DUKW, affects some production summaries. [1][2][6]
The most responsible short description is that the GMC CCKW family was produced in numbers exceeding half a million, making it one of the most widely built American military truck families of the war. Equating that family with the entire 2½-ton class creates a misleading impression.
After the war
The CCKW did not disappear in 1945. Wartime production stopped, but trucks already in service remained useful well into the post-war years, including the Korean War. Newer military truck families gradually replaced it, while surviving vehicles continued to serve other armies and civilian owners. [4]
Today, restored CCKWs in museums and historic vehicle collections remind us of the scale of the logistical effort behind Allied advances. Tanks may dominate battlefield photographs, but trucks made it possible for those tanks to keep moving.
Frequently asked questions
Is a GMC CCKW the same as a “Deuce and a Half”? The GMC CCKW is one particular truck family. “Deuce and a Half” is a broader nickname for the 2½-ton military truck class.
What separates the CCKW-352 and CCKW-353? The 352 was the short-wheelbase version; the 353 used a longer wheelbase.
Were 810,000 GMC CCKWs built? No. Numbers above 800,000 relate to a broader category of 2½-ton trucks. Published museum totals for GMC vehicles are in the roughly 560,000–570,000-plus range, with differences in counting scope.
Was the Red Ball Express made up only of GMC trucks? No. It was a large transport operation involving several vehicle types, transport units and support personnel.
Related scale model
Tamiya 1/35 GMC 2½-ton 6×6 cargo truck: ModofWar’s build completed in October 2019, with photographs and details of the model. View the model →
Sources
- The National WWII Museum — CCKW Hard Top. Vehicle production and Red Ball Express.
- Tucson Military Vehicle Museum — GMC CCKW 2½-ton 6×6 Truck. Development, specifications, roles and production.
- U.S. Army Transportation Corps — “Keep ’em Rolling”: African American Participation in the Red Ball Express. Route, dates, supplies and personnel.
- U.S. Army Center of Military History — The U.S. Army in the World War II Era, Catalog 69-6-1. Military service and mechanical characteristics.
- U.S. War Department — TM 9-801 Truck, 2½-ton, 6×6, GMC CCKW-352 & 353 (April 1944). Contemporary technical primary source.
- Tamiya — 1/35 U.S. 2½-ton 6×6 Cargo Truck, item 35218. Kit identification and broader vehicle-class context.
