I would recommend against using the Ford pump. These things have an integral reserve, and if you are running a ram of any kind, it will drain this quickly. Also, they do not like being run low on fluid. I would use a pump from a japanese truck, as they use a remote reserve, and you can make it any size you want. They also produce more pressure at a lower rpm. I am rigging one off of my old Isuzu Trooper diesel to fit my 84 F-250, to power a hydraulic winch. Northern tool and equipment also has a wide variety of hydraulic pumps for different app's.

Jared