CCKW 353 Cargo truck with winch
|Type||2 1⁄2 ton (2,268kg)[a] 6x6 Cargo truck|
|Place of origin||United States|
|Manufacturer||Yellow Coach/GM Truck and Coach|
|Specifications (353 Cargo w/winch)|
|Weight||8,800 lb (4,000 kg) empty
16,400 lb (7,400 kg) loaded
|Length||270 1⁄8 in (6.86 m)|
|Width||88 in (2.24 m)|
|Height||93 in (2.36 m) to cab
109 1⁄8 in (2.77 m) overall
91 hp (68 kW)
|Transmission||5 spd. x 2 range trf. case|
|Suspension||Beam axles on leaf springs|
|Fuel capacity||40 US gal (150 l)|
|300 mi (482.8 km)|
|Speed||45 mph (72 km/h)|
Thе GMC CCKW is a 2½ ton, triple-axle 6x6 U.S. Army cargo truck that saw heavy service in both World War II and the Korean War. The original "Deuce and a Half", it formed the backbone of the famed Red Ball Express that kept Allied armies supplied as they pushed eastward after the Normandy invasion.
The CCKW came in many variants, including open or closed cab, long wheel base (LWB 353) and short (SWB 352), and over a score of specialized models. It began to be phased out with the deployment of the 6X6 M35 in 1950, but remained in active U.S. service until the mid-1960s.
In 1940, the US Army set a requirement for a an all wheel drive 6x6 truck with a 12 ft (3.7 m) cargo area and a 2½ ton (2,268 kg) off-road payload. General Motors, already supplying modified commercial trucks to the Army, modified the 1939 ACKWX-built for the French Army-into the CCKW. The General Motors design was chosen by the Army and went into production at GM'S Yellow Truck and Coach division's Pontiac, Michigan plant alongside 6x4 CCWs. Later they were also manufactured at GM's St. Louis, Missouri Chevrolet plant.
- "C", designed in 1941
- "C", conventional cab
- "K", all-wheel drive
- "W", dual rear axles
Engine and driveline
The CCKW was equipped with the GMC 270 engine, an overhead valve I6 with 91 hp (68 kW) at 2750rpm and 216 lbf·ft (293 N·m) at 1400rpm. A 3 25⁄32 in (96 mm) bore by 4 in (102 mm) stroke gave a 269.5 cu in (4.4 L) displacement. This engine was designed for commercial trucks, and proved reliable in service.
The transmission was a Warner T93 5-speed with a direct 4th gear and overdrive 5th gear. The transfer case had high and low gears, and engaged the front axle. Originally all axles were a Timken split type, later trucks also used GM "banjo" types.
The CCKW had a ladder frame chassis with three driven beam axles, the front on semi elliptical leaf springs, the rear tandem on quarter elliptical leaf springs with locating arms. There were two wheelbases, the short Model 352 and the long Model 353. The short, 145 in (368 cm) / 167 in (424 cm)[b], was used with a short cargo bed as an artillery prime mover for 75mm and 105mm howitzers. All other models used the long, 164 in (417 cm) / 186 in (472 cm).[b] Tires were 7.50-20, brakes were hydraulic with vacuum assist.
Some were fitted with 10,000 lb (4,500 kg) front-mounted winches. These used longer frame rails, and could only be installed at the factory, rather than in the field.
Initially, all versions used a modified commercial closed cab design having a metal roof and doors. By 1944 an open cab version, with a canvas roof and doors, was used. This was easier to build, and the roof could be removed to lower the shipping height. 1 in 4 open cabs had a machine gun mounting ring above the co-drivers position.
The CCKW provided a platform for the widest range of bodies on any U.S. military vehicle, with the 12 ft (3.7 m) cargo version being the most common. As steel was more heavily rationed during the course of the war, the steel cargo bed was replaced by a wooden one. Wooden beds proved unsatisfactory and a 'composite' bed with steel sides, framing, and wooden bottom slats was developed. However, the composite bed was still unsatisfactory and the bed design returned to all steel.
Many specialized variants of the basic 6X6 CCKW were made, some in small numbers, including those converted in the field. These include:
- Short-wheelbase/long-wheelbase 2½-ton cargo truck
- Bomb Service
- Chemical decontaminating
- Chemical handling
- Dental Operating Van
- Fire Engine
- Fuel tanker (750 US gal (2,800 l))
- High lift
- K-53 Van
- K-60 Van
- Ordnance Maintenance Van
- Pipeline equipment
- Pontoon bolster
- Surgical Van
- Water purification truck
- Water tanker (700 US gal (2,600 l))
The AFKWX[d] 353, a cab over cargo bed version of the CCKW, went into production alongside it in 1942 at Yellow’s Pontiac plant and Chevrolet’s in St. Louis. Otherwise mechanically identical, its compact cabin design allowed a 15 ft (4.6 m), and later 17 ft (5.2 m) cargo bed to be fitted. The first 50 produced had closed cabs, all others were open. The cab over design made engine maintenance difficult.[how?] As a result, only 7235 were built, none with a front-mounted winch.
The DUKW[e] (“Duck”) was an amphibious truck that shared the CCKW's driveline. First produced at Yellow’s Pontiac plant, as demand increased production was added to Chevrolet’s St. Louis plant. The hull, designed by an America's Cup winner, had excellent sea-keeping abilities. A very successful design, 21,147 were built.
80th crossing the Rhine near Mainz
- List of U.S. military vehicles by supply catalog designation (G508)
- List of U.S. military vehicles by model number
- List of U.S. Signal Corps Vehicles
- General Motors
- M35 2½ ton cargo truck
- Chevrolet G506 trucks
- Studebaker US6
- 17th Armored Engineer Battalion
- Off-road load rating
- Measurements are from the centerline of the front axle to the centerline of rear bogie / rear axle.
- GM name: C for 1941, C for conventional cab, and W for tandem rear axles.
- GM name: A for 1939, F for forward cab, K for all wheel drive, and W for tandem rear axles.
- GM name: D for 1942, U for utility, K for all wheel drive, and W for tandem rear axles.
- "TM-9-2800 1943 Standard Military Motor Vehicles". US Dept. of the Army. 1 Sep 1943. pp. 238–276. Retrieved 31 Dec 2014.
- "TM-9-801 2 1⁄2 ton 6x6 GMC CCKW". US War Dept. 24 Apr 1944. pp. 6–9, 16–19. Retrieved 20 Dec 2014.
- David P. Colley (2000). The Road to Victory: The Untold Story of World War II's Red Ball Express. Potomac Books. ISBN 1-57488-173-6.
- Crismon, Fred W (2001). US Military Wheeled Vehicles (3 ed.). Victory WWII Pub. pp. 184, 326, 330–335, 465. ISBN 0-970056-71-0.
- Doyle, David (2003). Standard catalog of U.S. Military Vehicles. Kraus Publications. pp. 108–118. ISBN 0-87349-508-X.
- Ware, Pat (2010). The World Encyclopedia of Military Vehicles. Lorenz Books. pp. 238–239. ISBN 0-7548-2052-1.
|Wikimedia Commons has media related to GMC CCKW.|
- "GMC trucks at The-Blueprints.com". Onno van Braam. 2014. Retrieved 5 Oct 2014.