2006 Ford E450 Transmission issue
Traveling over the Rocky Mts in 100 degree heat the transmission fan ran occasionally. After a stop for lunch the transmission ran when we started up and went into limp mode when we tried to accelerat...
Forum Discussion
pianotuna wrote:Rolin wrote:
I don't understand exactly what Tow/haul does. I try to use it most of the time, but was experimenting to see what seemed to keep the transmission happy so we could limp home.
It locks out the overdrive.
No, that's not what it does. Your trans will still shift into overdrive with tow/haul engaged. What it actually does is change the shift profile in the TCM to hold a gear longer on acceleration, downshift sooner when encountering a grade, and downshift while going down hills. A tap of the brake should initiate a downshift which each tap, provided the engine speed is within the parameters that the ECM and TCM like.
Older Ford transmissions had a button on the shift lever to lock out overdrive, but the tow/haul function on 2005+ transmissions is completely different.
