![]() The bodies were installed by the Union City Body Company, a GM subsidiary based in Union City, Indiana. Beginning in 1958 GM began selling their own steel bodies on their forward control chassis, and called the new vans Step-Van. Brown, Olson, Alf-Herman, Universal and Montpelier to fit specialized van bodies to. Until 1958 GM only made the rolling forward-control chassis for other coachbuilders such as Boyertown, De Kalb, Dayton T. The standard transmission was a column-shifted three-speed, but a floor-shifted four-speed was added as an option in 1951, and heavier-duty Borg-Warner three-speed and the Hydramatic automatic transmission were also available as options beginning in 1954. (Most cars at the time relied on a draft tube to passively vent the crankcase gases to atmosphere when the vehicle was in motion, which was not feasible for the enclosed engine bay and anticipated use of the forward-control chassis for delivery vans.) The 265-cubic-inch (4.3 L) Trademaster V8 engine was available as an option in 19. The "Special" appellation was used to distinguish the fact it still had a downdraft carburetor (as the Dubl-Duti vans before it had) and a positive crankcase ventilation system to prevent combustion gases from passing up into the cabin while the truck was slow-moving or stationary. the 3742, with a 137 in (3,480 mm) wheelbase able to accommodate a 12 ft (3.7 m) bodyĪll models were available only with the "Loadmaster" six-cylinder engine, which was renamed the "Thriftmaster Special" in 1956.the model 3442, with a 104 in (2,642 mm) wheelbase able to accommodate a body length up to 8 ft (2.4 m),. #1940 CHEVY DUBL DUTI SERIES#In 1955 a new series of Chevrolet forward-control chassis launched, similar to the previous Dubl-Duti, available in three sizes: The "Thriftmaster" engine was carried over for the 19 model years, and replaced for 1951 by the 235.5-cubic-inch (3.9 L) "Loadmaster" engine. Despite the "Advance Design" trucks being released in calendar year 1947 as a 1948 model, the AK Series-based Dubl-Duti continued production for another year thereafter.Ī new generation of Dubl-Duti was introduced for model year 1949, with two different wheelbases shared with the medium-duty Advance Design pickup trucks: the model 3742 with 125 + 1⁄ 4-inch (3,181 mm) wheelbase, and 137-inch (3,480 mm) log model 3942. The Dubl-Duti was restyled in 1941 to suit the new Chevrolet AK Series truck body. The Dubl-Duti van used the same 216.5-cubic-inch (3.5 L) "Thriftmaster" six-cylinder engine as the pickup and Chevrolet passenger cars, but with a single-barrel updraft Carter carburetor rather than the downdraft Rochester unit used in other Chevrolet trucks. The van was built on the 115-inch (2,921 mm) chassis of the Chevrolet pickup truck, with a body built by Divco Twin. The first generation of General Motors multi-stop delivery van was called the Dubl-Duti, introduced in 1940. ![]()
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