Posted 2010-11-15 5:08 PM (#127105) Subject: 2007 F-350 with TowHaul
Regular
Posts: 67 Location: Edinburg, Va.
Has anyone else experienced this with a similar truck? We were towing our small bumper pull. Started down a moderate grade at about 45-50 mph. Tranny started to downshift and then appeared to upshift and then went into a freewheel or neutral. Tow Haul indicator was still on. Nothing showing on tach, no power on acceleration. Freewheeled for about 1/4 mile, after hitting accelerator several times, truck went back into gear and operated correctly the rest of the way home. We had come over the mountain and earlier had come down a very steep grade at slow speed. Very thankful that we weren't pulling the big gooseneck loaded.
Truck is currently at the dealer to see what the problem may have been but you know how that goes. Hoping someone out there has some knowledge with this issue. Thanks
Posted 2010-11-15 8:40 PM (#127126 - in reply to #127105) Subject: RE: 2007 F-350 with TowHaul
Expert
Posts: 3853 Location: Vermont
Originally written by gaitin on 2010-11-15 6:08 PM
Has anyone else experienced this with a similar truck? We were towing our small bumper pull. Started down a moderate grade at about 45-50 mph. Tranny started to downshift and then appeared to upshift and then went into a freewheel or neutral. Tow Haul indicator was still on. Nothing showing on tach, no power on acceleration. Freewheeled for about 1/4 mile, after hitting accelerator several times, truck went back into gear and operated correctly the rest of the way home. We had come over the mountain and earlier had come down a very steep grade at slow speed. Very thankful that we weren't pulling the big gooseneck loaded.Truck is currently at the dealer to see what the problem may have been but you know how that goes. Hoping someone out there has some knowledge with this issue. Thanks
Posted 2010-11-15 9:10 PM (#127130 - in reply to #127105) Subject: RE: 2007 F-350 with TowHaul
Expert
Posts: 3853 Location: Vermont
The tow haul strategy from Ford is stated below:Tow Haul: The Tow Haul feature was designed to assist the driver when towing a trailer or a heavy load. All transmission gear ranges, including all five forward gears, are available when using the tow haul feature. The tow haul function is activated and deactivated through a switch located on the end of the shift lever. The indicator light that is located at the end of the shift lever will illuminate when the tow haul is activated and will go off when deactivated. On some models, the indicator light is located on the instrument panel. 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. Up Shifts 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: 1.positive vehicle acceleration is sensed (natural acceleration from grade descent). 2.a near zero accelerator pedal position is obtained. 3.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.
Posted 2010-11-15 9:47 PM (#127133 - in reply to #127126) Subject: RE: 2007 F-350 with TowHaul
Regular
Posts: 67 Location: Edinburg, Va.
Not in cruise control; driving and using towhaul as we have done with the last 2 trucks with towhaul since 2004. First time we have ever experienced this particular transmission operation.
2007 F-350 with TowHaul
