The GMC CCKW, also known as "Jimmy", or the G-508 by its Ordnance Supply Catalog number, was a highly successful series of off-road capable, 21⁄2-ton, 6×6 trucks, built in large numbers to a standardized … See more

In 1939-1940, the US Army Ordnance Corps was developing 2+1⁄2 short tons (2,300 kg) load-rated (off-road rating) 6×6 tactical trucks that could operate off-road in all weather. … See more

Engine and drive-line
The CCKW was equipped with the GMC 270 engine, an overhead valve inline-6 with 91.5 hp (68.2 kW) or 104 hp (78 kW) at 2,750 rpm, and 216 lb⋅ft (293 N⋅m) at 1,400 rpm. A 3+25⁄32 in (96 mm) bore by 4 in (102 mm) … See more

• 21⁄2-ton, 6×6 truck (U.S. Army)
• DUKW 21⁄2-ton, 6x6, amphibious truck
• Chevrolet G506 11⁄2-ton, 4×4 truck
• M35 2+1⁄2 ton cargo truck See more

The name CCKW comes from GMC model nomenclature:
• "C", designed in 1941
• "C", … See more

Sources do not precisely agree on the total numbers of CCKWs built by the end of production in 1945. Ware (2010) lists one single number of … See more

• 80th Division crossing the Rhine near Mainz
• Red Ball Express convoy, 1944
• Restored maintenance vehicle
• Restored … See more