The DUKW is capable of carrying a 2 1/2 ton payload over land or water. It is equipped with a GMC 270 cubic inch 6 cylinder gasoline engine. It has a 5 speed transmission with a 2 speed transfer case. This gives a total of 10 forward speeds and 2 in reverse. It has 6 wheel drive, a water propeller and a 10 ton winch. All or any of these can be run separately or together in any combination. Top speed on land is 50 to 55 mph while on the water top speed is only 6 mph (land miles per hour not knots). It also has a tire inflation system with a 2 cylinder air compressor and air storage tank. This allows the driver to inflate or deflate any one or all six tires at the same time from the dashboard. The dashboard also has a tire pressure gauge so that air pressure can be monitored. The front brake lines are protected in steel conduit with barbed wire cutters on the outside. The DUKW weighs 7 1/2 tons empty and is 31 feet long. DUKWs were manufactured from 1942 to 1945 by General Motors Corporation.
D=First year of production code "D" is for 1942 U=Body style "U" utility truck (amphibious) K=Front wheel drive. GMC still uses that on trucks today (K5 Chevy Blazer) W=Two rear driving wheels (tandem axle)
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