Tow Haul.......When?
2003 GMC 2500HD pulling a roughly 11,000 LB 5th. Would you leave it in Tow/Haul on flat/level highways? Or do you put it in t/h and leave it?
Forum Discussion
Tow Haul mode is designed to minimize heat buildup in the transmission be changing shift points and also keeping the torque converter locked longer before upshifting. GM's engineers recommend using Tow Haul mode when the total load is greater than 75% of the GCWR for the truck.
If your truck weighs 6,000 lbs. and has a GCWR of 20,000 lbs. then Tow Haul would be engaged when the trailer load exceeds 10,500. My 2011 GM diesel truck weighs 7,200 lbs. and has a GCWR of 29,000 lbs. so Tow Haul should be engaged when I am towing more than 14,550 lbs. per GM's recommendation.
Some people mistakenly think Tow Haul helps with overall performance when towing and it does not. Many also take the transmission out of Auto and manually do downshifts and with GM trucks this shuts off Grade Control entirely.
If your truck weighs 6,000 lbs. and has a GCWR of 20,000 lbs. then Tow Haul would be engaged when the trailer load exceeds 10,500. My 2011 GM diesel truck weighs 7,200 lbs. and has a GCWR of 29,000 lbs. so Tow Haul should be engaged when I am towing more than 14,550 lbs. per GM's recommendation.
Some people mistakenly think Tow Haul helps with overall performance when towing and it does not. Many also take the transmission out of Auto and manually do downshifts and with GM trucks this shuts off Grade Control entirely.
