1939 Chevrolet 4 x 4 FAT
Hanno refers above to the Maple Leaf 4 x 4 FAT. In fact there was a 'Chevrolet' 4 x 4 Field Artillery Tractor was trialled by the British War Office in 1939. It had selectable ratios: in high gear 2-wheel or 4-wheel drive could be engaged. However in low auxiliary gear 4 x 4 drive was always engaged.
Incidentally I found out that the Unipower 6 x 4 conversion: see WHEELS & TRACKS # 50 from Universal Power Drives Limited probably used a Thornton-Detroit rear splitter as wellas either Thornton or Timken banjo-type axles. This explains why Bart suggests that the Unipower conversion was similar to the Thornton, and used Rzeppa steering components. There is a suggestion in the DND archives that Gotfredsons of Windsor, Ontario, might have offered the same set-up as Universal Power Drives pre-war.
The plot thickens!
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