Today in WW II: 17 Oct 1941 USS Kearny [DD-432] torpedoed but not sunk by German submarine U-568, near Iceland, killing 11 sailors, the first American military casualties of WW II.  More 
17 Oct 1943 At Gothenburg, about 10,000 seriously wounded and sick German and British POWs, about half from each side, make up the first British-German prisoner exchange of WW II [17-21 Oct].
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Mack NM 6 Ton 6x6 Truck (G535)

The combat "N Series" were the first military 6x6 trucks by Mack. The NM-1 (87 built) appeared in early 1940, followed by the NM-2 (107 built) and NM-3 (104 built) all with enclosed hard cabs. The NM-5 through NM-8 did away with the metal cab, replacing it with the military soft canvas top. There was no NM-4 produced. The arched front bumper -- to clear a pintle hook -- first appeared with the NM-3. Approximately 10,000 of these trucks were produced in total.

The engine for the Mack NM 6x6 trucks was the 6 cyl. 707 cid Mack EY, that developed 159hp@2100 rpm and provided 530lb-ft of torque@1000rmp. The transmission was the 5-speed Mack TR36 and the transfer case the 2-speed Timken-Detroit T77. The truck had a net weight of 22,659 lbs., could carry almost 10 tons (never mind the 6 ton rating) and could tow 30,000 lbs. such as field artillery or ammunition trailers.

A Gar Wood capstan winch was mounted behind the cab. The cargo body was steel for the NM-1 through NM-3, then wood.

Manuals for this series of trucks include:

  • Parts List: TM 10-1476
  • Operators Manual and Maintenance: TM 10-1477

Mack NM-3 6 Ton 6x6 Truck (G535).  Note odd wheel arrangement on front axle
Mack NM-3 6 Ton 6x6 Truck (G535). Note odd wheel arrangement on front axle.

Mack soft top NM 6 Ton 6x6 Truck (G535) on Army test track.
Mack soft top NM 6 Ton 6x6 Truck (G535) on Army test track.