On the newer Dodges (07.5 and newer), the Tow/Haul (as Steve mentioned) does not lock out the overdrive but actually changes the shift points, makes the converter lock in much more forcefully (some have complained about hard shifts both up and downshifting), and, as I just mentioned, introduced a forceful downshift that makes the Variable Vaned Turbo much more effective as an exhaust brake. Much like the Allison tranny in GM products, we can now come to an almost complete stop without touching the brakes using just the tow/haul mode and VVT.. super and very nice savings on the brakes.
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