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While I have little experience in interpreting transmissions, if the rear wheels are spinning frictionlessly on ice, how can they have any torque? Torque is a force applied, not a rotational velocity. No friction = no torque, at least in physics.
Perhaps the rear wheels remain engaged, and turning as fast as the front wheels, but at times they are applying no torque, and all the torque is coming from the front wheels?
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