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In my experience with installing a stroker crank in motorcycle engines, it did increase torque according to my seat-of-the-pants dyno I was using at the time. When you twisted the throttle, you could feel it lift the front wheel off the ground a lot easier at lower RPMs. It makes sense because the extra stroke gives a better mechanical advantage when the piston is pushing down on the throw of the crank. The difference in stroke is so small between the 3.8 and the 3.9 that it just doesn't make sense to go to all that trouble to make new cranks and pistons for a 3.8. Maybe it was just enough extra stroke that it got the heavier vans and trucks accelerating better at low speeds? OR, maybe the 3.9 crank and pistons were used in an entirely different engine and they just happened to work in the 3.8 so they were just using parts on hand to fill out the 2004 Mustangs knowing they were going to use the OHC 4.0 V6 in 2005 Mustangs? I'm glad to find that the engines are basically the same. There aren't enough changes to discourage me from buying a 2004 mustang with a 3.9 V6.

Thanks, 2seater. Great info. I did not know that. I was misinformed.