Tow haul button
I have a 04.5 duramax 3500 and I'm not sure when to use the tow/haul button on my gear shift also using this will it help my MPG? Thanks.
Forum Discussion
There is no real manual mode on these transmissions. All they do is limit the top gear the transmission uses. They still shift automatically up to that gear. If selected, the tow haul program is still functioning even with the transmission in "manual" mode.
