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<p>[quote user="7j43k"]With a three axle truck, the torque around the kingpin could be eliminated.  But then the center axle would be thrust towards the opposite side of the gearbox compared to the outer axles.  This would cause misalignment of the three wheelsets.[/quote]</p> <p>Not sure about now, but the original drives had dummy center wheels (darths video of buildng a PA kit shows this.</p>
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