Ive never seen a medium duty Mack but i would love to have one, best truck we ever ran was the late 90's chevy with a cat in it, ive had a few with the Tonawanda gas engines on propane and they wld last forever.And yes the freight shaker is a POS but the engine hasnt given us any problems after we put 2 new pumps and 18 injectors in it when it was new.
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