The drive was transmitted to each axle via a Cotta three-speed constant-mesh gearbox through a single speed silent chain transfer case with a lockable center differential.

The transfer case was equipped with two differential locks to allow the vehicle to be driven in either front or rear drive mode in the event of a driveshaft failure.

[7] An American export agency was set up with a reception base in Liverpool and a repair depot in Islington to check and service incoming vehicles before handing them over to the Ministry of Munitions.

A total of 2,925 Model Bs were purchased by the British Army, 1,599 of these were used in France on the Western Front, predominantly for heavy haulage of artillery, ammunition, and pontoon bridge supplies.

According to 1st Lt. E. R. Jackson, the official Ordnance Department Observer: "The three (3) Four Wheel Drive Trucks were, in general, the most satisfactory in the Convoy and of all of the various makes represented, the F.W.D.

He also noted that the Model B's were more reliable than the other vehicles and completed the entire trip on their original tires but they showed "a decided tendency to run into the bad spots" of uneven roads.