i drove quite a few Daks prior to buying, and honestly didn't feel like the 5.9 had any significant pull over the 4.7's, little more on the low end, but once the 4.7 gets revving, it pulls. I don't think there is much you can do to the 4-spd tranny behind the 5.9, same unit that is in the 5.2 zj's I think.