05 Auto Trans-Tow and Haul mode

[GSP7]

Was watching this vid



So Ive been wondering about the "Tow and Haul mode".... My 2nd gen truck the button just locked out OD

Now My 2005 It says 'Tow and Haul' instead of 'OD off' when you push the button. And I found out the 2005 it doesnt lock out the OD.
I still dont know exactly "tow and haul" does, put that vid says it increases line pressure

So what is everything that the 'Tow and Haul' mode does? What is exactly programmed into the trans controll for "tow and Haul" and is it just the valve body or programmed into the ECM or PCM?

Also is 2005 the only year that did not lock out OD?

I know a couple good trans shop guys but havent had a chance to ask

 

[GSP7]

No one knows what exactly the "tow haul" mode does.....

 

[Ozymandias]

Changes shift pattern and tc lock up behavior from what I know, pretty much like on a modern one.
Does not lock out 4th gear on the 05.

06 can lock out 4th AND changes shift pattern.

 

[AH64ID]

Tow/Haul extends the shift points and runs more pressure.

In 05 you can have the TH button changed to an OD off button, but you lose the TH programming.