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M-39 Series 5-ton, 6x6 Trucks

The M-39 series five ton 6x6 truck appeared in the early 1950s as a heavier variant of the 2 1/2 ton M-35 series trucks. With parts commonality and many similar features, the two series of trucks served U.S. ground forces for decades.

Marines from 2nd Maintenance Bn, 2nd Force Service Support Group, perform maintenance on an M-54 5-ton 6x6 cargo truck, Port Authority, Wilmington, NC, 5 September 1981
Marines from 2nd Maintenance Bn, 2nd Force Service Support Group, perform maintenance on an M-54 5-ton 6x6 cargo truck, Port Authority, Wilmington, NC, 5 September 1981.

Today in WW II: 23 Nov 1940 Ford delivered the Pygmy prototype jeep to the US Army.  More 
23 Nov 1942 SS Ben Lomond sunk by German U-boat off the coast of Brazil.
23 Nov 1943 Deutsche Opernhaus, Kaiser Wilhelm Memorial Church, and many other buildings destroyed by a 764 aircraft RAF bombing raid on Berlin [22-23 Nov].
23 Nov 1944 Strasbourg, in eastern France, liberated by French General LeClerc's 2nd Armored Division. Eisenhower orders controversial halt at the Rhine by US Sixth Army Group.
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

US Military M-39 Series 5-ton, 6x6 Trucks (G-744)

Production of the M-39 series of five ton trucks began in 1951, in a rush to meet requirements for the Korean War. By 1953 the trucks had been standardized and the early production by International Harvester, Diamond T, and Mack was replaced by much larger contracts with IH and Kaiser Jeep.

Truck models in the M-39 Series include:

Variants with a suffix (e.g. M54A2 or M291A1D) have modifications from an earlier base model (e.g. M54 or M291D), as further explained below. Photos and additional information about many of the M-39 series trucks are on the pages linked from the list above.

There were three wheelbase configurations for the M39 series trucks:

  • Standard: 179 inches
  • Long: 215 inches
  • Dump Truck: 167 inches

The M-39 series trucks were 98 inches wide with typical cab height of 121 inches (soft top erected). The length varied with the wheelbase and body type.

The cab design of the M-39 series five ton trucks was shared with the M-35 series 2 1/2 ton trucks, so both have a very similar look. However, the M51, M52, M543 and late-production M62 have two fuel tanks, one on each side, while the M-35 series have only a passenger side tank. The M41 Cargo Truck had single rear wheels with 14:00x20 tires as opposed to the M54 Cargo Truck with its 11:00x20 tires and duals on the rear axles. Both had the standard wheelbase of 179 inches. The steel cab with steel doors had a canvas top -- with the top removed and the windshield folded, the height was considerably reduced.

Thanks to MSG J. Durham for help with this section.

Manuals for the M-39 series of trucks were first produced before the modern system of manual numbering was introduced. The manual for Operation and Organizational Maintenance was originally TM 9-837 (June 1951) which was then replaced by TM 9-8028 (June 1955). Manuals from the new system will be numbered TM 9-2320-211-xx where the xx represents the maintenance level. All together there are dozens of multi-volume manuals for the series of trucks.

Find additional photos and hi-res versions of the M-39 series trucks at the Olive-Drab Military Mashup:

M62 5-ton Medium Wrecker Truck, from the M-39 series of 5 ton 6x6 trucks, serial number 4874, built by International Harvester Corp., delivered on 1 December 1952. This vehicle was Lot 1114 of The Jacques M. Littlefield Collection, Military Vehicle Technology Foundation, Portola Valley, CA, auctioned 11-12 July 2014 by Auctions America. Courtesy:   Auctions America by RM.
Vietnam veterans crowd around a Truck, Cargo, 5 Ton 6x6 M54, part of a display of military vehicles during Operation Homecoming USA in Branson, MO, 13-18 June 2005.
2nd Battalion, 138th Field Artillery, Kentucky National Guard, assigned to XXIV Corps, Vietnam, circa 1968.  A truck mounted crane loads artillery ammunition into a Truck, Cargo, 5 Ton 6x6 M54. Courtesy Kentucky National Guard.
2nd Maintenance Bn, 2nd Force Service Support Group, perform a maintenance inspection on a Marine M-54 5-ton 6x6 truck in a staging area, Wilmington, NC, 5 Sep 1981
Kaiser Jeep corp, 5 ton, 6x6, M51A2, Dump truck, with 20K winch, vin# 96-31817-69-L723-10733, 5 speed manual transmission, with LDS 4651A multi fuel engine, odometer 29411, hour meter 2350. Courtesy: Government Liquidation LLC.
M246 Truck, Tractor, 5 ton, 6x6, Wrecker at the New York City Veterans Day parade, 11 November 2013.  Photo courtesy Phil Gilson.

M39 Series Evolution

As the M39-series vehicles evolved, the engine and other aspects of the basic configuration were improved. This table applies to most of the trucks in the M-39 series and will be indicated by their A-level suffix (e.g. A1 or A2). All models had a two speed transfer case and air-assisted hydraulic brakes.

 M39M39A1M39A2
Engine Type (6 cal)Continental R6602 GasolineMack ENDT-673 DieselLDS-465-1A Turbo Multifuel
Engine Horsepower224@2800rpm210@2100rpm205@2600
Engine Torque504 lb-ft610 lb-ft425 lb-ft
TransmissionSpicer 6352 5spd manualSpicer 6453 5spd manualSpicer 6453 5spd manual

The engine air intake of M-39 series vehicles is mounted on the right front (passenger side) fender, the opposite of the M-809 series trucks. M39-series trucks equipped with the Continental R6602 gasoline engine had no fender mounted air cleaner.

The M-39 series trucks were superseded by the M-809 series of 5 ton trucks, but both types of trucks continued to be used for many years.

Recommended Books with more about M39-series Trucks

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