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manufacture date is 3/91, so it seems I got the "big" one....that might explain the different behaviors of the two motors. Almost like a gas vs diesel. His is very snappy and quick and mine feels heavier but is not lacking in the torque dept. It can get moving in a hurry if I am willing to sacrifice some fuel.
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1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
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