Any of those older trannys will be 1 to 1 ratio in high gear. You have to get well into the 1970s to get a five over. Ratios in the lower gears wouldn't make much difference with everything that slow speed. If you use a non Canadian military bell housing the clutch fork sticks out on the wrong side so clutch linkage would be a nightmare. Those old straight cut trannys will last forever so I can't see any reason to make the swap.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun
1940 Cab 11 F15A w/ Chev rear ends
1941 Cab 12 F15A
1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
1943 Cletrac M2 High Speed Tractor
MkII Bren gun carrier chassis x 2
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