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That is definitely one way to destroy your 1/2 ton drivetrain. A 6BT weighs in at like 1160 lbs. And even the 12 Valve has around 450-500 lb. ft of torque. Pretty cool Bronco though.
i measured my 71 out before i put my 4BT in. without pushing the drive train back the fan pully would have ben at the front of my radator. Tight to say the least. i need stiffer springs for the 4cyl.