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M-939 Series 5-ton, 6x6 Trucks

The M939 truck was introduced in 1983, a Product Improvement Package upgrade of the M-809 series of 5-ton, 6x6 trucks. The M939s are general-purpose military vehicles, primarily designed for tactical, off-road use, with a top speed of 65 mph. The older fleet of M809 series tactical trucks were augmented by the M939 series without replacement.

M923 Truck, Cargo, 5-ton, 6x6, 6x6 Dropside, on a Somali road, between Mogadishu and Biadoa, Operation Restore Hope, 14 January 1993
M923 Truck, Cargo, 5-ton, 6x6, 6x6 Dropside, with machinegun ring mount, on a Somali road, between Mogadishu and Biadoa, Operation Restore Hope, 14 January 1993.

Today in WW II: 23 Jul 1940 American Bantam and Willys-Overland submit the only two bids for the Quartermaster Corps light reconnaissance and command cars, the origin of the military jeep.  More 
23 Jul 1941 Original World War II contract for jeeps awarded to Willys with Ford added Nov 1941 to increase production.
23 Jul 1945 Submarine USS Barb [SS-220] destroys a Japanese locomotive and supply train at Patience Bay off the coast of Karafuto, Japan, the only known such attack by a submarine.
Visit the Olive-Drab.com World War II Timeline for day-by-day events 1939-1945! See also WW2 Books.

US Military M-939 Series 5-ton, 6x6 Trucks

The M-939 Series 5-ton, 6x6 truck design was created by AM General Corp. who also built the M939 and M939A1 trucks. The M939A2 trucks, delivered starting in 1989, were produced by Bowen-McLaughlin-York.

The major improvements of the M939 Series vehicles over the M809 Series vehicles are as follows:

  • Allison automatic transmission
  • Improved power steering system
  • Complete air brake system
  • Improved cooling system
  • Improved electrical system
  • Cab for three crew members
  • Tilt hood
  • Hydraulically powered front winch
  • STE/ICE engine diagnostic system

The Family of Medium Tactical Vehicles (FMTV) will eventually replace the M939 series vehicles, along with the M809 series and other legacy vehicles, as resources permit.

SGT Gregory D'Angelo, 268th Transportation Co., checks the engine of an M-923 5-Ton Cargo Truck, Antigua, 19 April 2002
SGT Gregory D'Angelo, 268th Transportation Co., checks the engine of an M-923 5-Ton Cargo Truck, Antigua, 19 April 2002.

M-939 Series 5-ton, 6x6 Trucks Models and Variants

There are many variants of the M939 series 5-ton 6x6 trucks including:

  • M923 Truck, Cargo: 5-ton, 6x6 Dropside
    • M923 NSN 2320-01-050-2084
    • M923A1 NSN 2320-01-206-4087
    • M923A2 NSN 2320-01-230-0307
  • M924 Truck, Cargo, 5 ton, 6x6 LWB w/o winch NSN 2320-01-047-8773
  • M925 Truck, Cargo: 5-ton, 6x6 Dropside w/winch
    • M925 NSN 2320-01-047-8769
    • M925A1 NSN 2320-01-206-4088
    • M925A2 NSN 2320-01-230-0308
  • M927 Truck, Cargo: 5-ton, 6x6 XLWB
    • M927 NSN 2320-01-047-8771
    • M927A1 NSN 2320-01-206-4089
    • M927A2 NSN 2320-01-230-0309
  • M928 Truck, Cargo: 5-ton, 6x6 XLWB w/winch
    • M928 NSN 2320-01-047-8770
    • M928A1 NSN 2320-01-206-4090
    • M928A2 NSN 2320-01-230-0310
  • M929 Truck, Dump: 5-ton, 6x6
    • M929 NSN 2320-01-047-8756
    • M929A1 NSN 2320-01-206-4079
    • M929A2 NSN 2320-01-230-0305
  • M930 Truck, Dump: 5-ton, 6x6 w/winch
    • M930 NSN 2320-01-047-8755
    • M930A1 NSN 2320-01-206-4080
    • M930A2 NSN 2320-01-230-0306
  • M931 Truck, Tractor: 5-ton, 6x6
    • M931 NSN 2320-01-047-8753
    • M931A1 NSN 2320-01-206-4077
    • M931A2 NSN 2320-01-230-0302
  • M932 Truck, Tractor: 5-ton, 6x6 w/winch
    • M932 NSN 2320-01-047-8752
    • M932A1 NSN 2320-01-205-2684
    • M932A2 NSN 2320-01-230-0303
  • M933 Truck, Tractor: 5-ton, 6x6 w/winch
    • M933 NSN 2320-01-047-8768
    • M933A1 NSN
    • M933A2 NSN
  • M934 Truck, Van, Expansible: 5-ton, 6x6, XLWB
    • M934 NSN 2320-01-047-8750
    • M934A1 NSN 2320-01-205-2682
    • M934A2 NSN 2320-01-230-0300
  • M935 Truck, Van, Expansible: 5-ton, 6x6, XLWB w/Hydraulic Lift Gate
    • M935 NSN 2320-01-047-8751
    • M935A1 NSN 2320-01-205-2683
    • M935A2 NSN 2320-01-230-0301
  • M936 Truck, Medium Wrecker: 5-ton, 6x6 w/winch
    • M936 NSN 2320-01-047-8754
    • M936A1 NSN 2320-01-206-4078
    • M936A2 NSN 2320-01-230-0304
  • M939 Truck, Chassis: 5-ton, 6x6 w/winch
    • M939 NSN 2320-01-048-2450
    • M936A1 NSN
    • M936A2 NSN
  • M940 Truck, Chassis: 5-ton, 6x6 w/winch
    • M940 NSN 2320-01-047-8743
    • M940A1 NSN
    • M940A2 NSN
  • M941 Truck, Chassis: 5-ton, 6x6
    • M941 NSN 2320-01-048-8742
    • M941A1 NSN
    • M941A2 NSN
  • M944 Truck, Chassis, 5-ton, 6x6
    • M944 NSN 2320-01-047-8745
    • M944A1 NSN 2320-01-205-2667
    • M944A2 NSN 2320-01-230-0287
  • M945 Truck, Chassis, 5-ton, 6x6
    • M945 NSN 2320-01-050-4894
    • M945A1 NSN 2320-01-205-2668
    • M945A2 NSN 2330-01-230-3261

Over 30,000 of the M939 series trucks were delivered to the U.S. military. Of the many models in the M-939 series of 5-ton, 6x6 trucks, the most common in service were:

  • M923 Truck, Cargo
  • M925 Cargo Truck w/Winch
  • M927 XLWB Truck
  • M931 5-ton Tractor
  • M936 Medium Wrecker.

Wheelbase:

  • M927, M928, M934, and M945 model vehicles utilize the 215 in. (546.1 cm) Extra Long Wheelbase (XLWB) chassis to facilitate transporting of large and awkward loads
  • M923, M925, and M936 model vehicles utilize the 179 in. (454.7 cm) wheelbase
  • M929, M930, M931, and M932 model vehicles utilize the 167 in. (424.2 cm) wheelbase

Engines used for the M939 series were:

 M939 & M939A1M939A2
Engine Model655cid Cummins NHC 250504.5cid Cummins 6CTA8.3
FuelDieselDiesel
Horsepower240@2100rpm240@2100rpm
Torque685 lb-ft@1500rpm745 lb-ft@1500rpm
NSN2815-01-111-22622815-01-312-0018

The M939 was fitted with 11:00R20 tires and tandem wheels on the rear axles while the M939A1 and M939A2 trucks were fitted with single rear wheels and larger 14:00R20 tires. Only the M939A2 vehicles are equipped with the centralized tire inflation system (CTIS).

The air brakes of the M939 series trucks are overly sensitive when the trucks are lightly loaded, empty, or when operating the vehicle on wet or slippery pavement. To rectify this problem, the military retrofitted these trucks with ABS brakes between 1999-2002.

Manuals for the M-939 series of 5-ton 6x6 trucks will be numbered TM 9-2320-272-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 M939 series 5-ton 6x6 Trucks at the Olive-Drab Military Mashup:

US Army Soldiers, from 515th Transportation Battalion, Manheim, Germany, line up their M939 5-ton 6x6, HEMTT, and Palletized Load System (PLS) 10x10 vehicles before conducting a convoy to Grafenwoehr, for live fire training on 24 August 2004.
Trailer, Powered, Wrecker/Recovery, MK15/MK15A1 Mod 0.  The MK15/15A1 Rear Body Unit (RBU) combines with the MK48/48A1 Front Power unit (D0209) to form the wrecker/recovery variant of the Logistics Vehicle System (LVS). It is a fully equipped wrecker for recovery of disabled vehicles and Material Handling Equipment. The MK15/15A1 is primarily used for recovery of all LVS vehicles and is capable of lifting and towing the M809, M939, HMMwV-A2 series ofvehicles and the MTVR family of vehicles.
Truck, Cargo, Dropside, M925A1.  The basic difference between the M925A1 and M923A1 (dropside variant of the M939 series of 5 ton trucks) is that the M925A1 has a 20,000 pound capacity winch located behind the front bumper and the M923A1 does not. The winch feature affects truck length, weight, shipping dimensions and angle of approach. The M939 series possesses the tilt hood and fender configuration.
Truck, Cargo, Extra Long Wheelbase, M928A1.  The basic difference between the M928A1 and M927A1 (extra long wheel base (XLWB) model of the M939 series of 5 ton trucks) is that the M928A1 has a 20,000 pound capacity winch located behind the front bumper and the M927A1 does not. The winch feature affects truck length, weight, shipping dimensions and angle of approach.
Truck, Cargo, XM956, 5 Ton, 6x6, AM General.  Prototype of trucks in the M939 series.  FSN 2320-226-6251 Courtesy: Government Liquidation LLC
M939 series truck being offloaded at the New Haven port, 1994

Recommended Book with more About the M939 Series of 5-Ton 6x6 Trucks

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