The 300 is one of Ford's most durable motors. It builds great torque due to to it's long stroke. I had a 84 F-250 with a 4 speed and 300. It would easily pull two full anhydrous ammonia tanks which weighed approximately 20,000 lbs full. Besides anhydrous tanks, we'd pull a 30 ft Donahue trailer loaded with drills(used for seeding crops), self propelled swathers, also pull large 800 bushel grain dryer. You name it, it would pull it. Also had a 89 F150 with a 302 and a 4 speed. It wouldn't pull nearly what the 300 six would pull. I wouldn't hesitate to buy another 300 for a work truck. Plus that pickup had 160,000 miles on it when I sold it , motor was untouched and still ran strong, although rings or guides were starting to wear as it was using oil, but all in all a great motor.