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Dearfield Co. | I had some r model macks with what they called 300s.They were 12 liter power .These trucks had 5 speed transmissions in them and they ran all over the US.If you got them in PA or the rocky mountains your right arm would get a workout but they worked -------------------------------most of the guys who say you have to have 13 or 18s on the farm are the same ones that have to have a big bunk long hood 550 horse power to run 20 miles to the elevator | |
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10 speed vs 13 speed tranny
