The output from the transaxle is already at its "final drive" since the output has already went through the transmission.
OK now you bolt on the transfer case which has NO reduction or internal gearing other than 1:1 since it is being driven off of the output shaft which would "normally" be turning one of your front axles.
So in turn to get the rear wheels to turn at the same speed as the front wheels the gear in the rear needs to be 1:1 (one turn of the drive shaft = 1 turn of the wheels)
[B]1951 McCormick FARMALL M
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