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An M35A2 with the 4.90 aftermarket ring/pinion would run 78.6 mph at 2500 with 9.00-20 tires (40.9" height). That's unworkable.
A ratio around 5.90 (65mph @ 2500), in lieu of 6.72 (57.3mph @ 2500), might suffice with that 140 horsepower. Acceptable "startability" must be maintained.
I can't find the KM250's axle specs.
They say max engine rpm is 2900, and top speed is 95 km/h. That's 59 mph.
M35A2 at 2500 rpm/.79 overdrive/6.72 ratio/9.00-20 top speed is 57.3 mph