
11-15-2009, 07:00 PM
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Powerstroke Techie
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Join Date: Jun 2008
Location: Brampton, Ontario, Canada
Posts: 2,583
Feedback Score: 0 reviews
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As per Ford Workshop Manual Description And Operation:
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Originally Posted by Ford Workshop Manual
With the tow haul activated, the transmission will have the following features:
-Shifts will occur at higher vehicle speeds for a given accelerator pedal position to improve vehicle acceleration, reduce excessive shifting and increase the coast braking capability.
-The torque converter will lock up at lower vehicle speeds than normal with a given accelerator pedal position to improve transmission cooling and efficiency.
-Upshifts are temporarily delayed while decreasing accelerator position during hill cresting to reduce excessive transmission shifting and to prepare for a possible grade braking downshift event.
-Engine braking is provided in all forward gears without the requirement of moving the shift lever.
-Manual 1, 2 or 3 will still be available.
-Grade braking downshift feature provides increased coast braking automatically to assist driver in maintaining desired speed while descending a grade. This reduces duty cycle on the brake system and increases brake pad longevity.
-Grade braking downshifts are automatically commanded when:
*positive vehicle acceleration is sensed (natural acceleration from grade descent).
*a near zero accelerator pedal position is obtained.
*a minimum amount of time has expired since the last grade braking downshift.
-Grade braking downshift mode is immediately exited should the tow haul mode be deactivated or if the accelerator pedal is depressed beyond a minimum threshold.
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