does tow/haul=overdrive

[martinoledad]

i was just wondering if the Tow/haul button was the same thing as the overdrive button on the older models.

[shotgun]

The best I can figure out it's also different shift points, lock up points, and shift delays. In short, it's a completely different shifting strategy. It also provides engine brakeing.

The manual provides a lot of good information.

[88Racing]

Good job Shotgun!
Ford has copied GM on this one. GM has been running a set up like this since 2003. At least they have on the HD gassers.

[shotgun]

Even a blind squirrel finds a nut once in a while. :giggle:

Do you think they change the AFR too (richer)? :shrug:

[Jackpine]

Holy Cow! What a great modification! Makes me ALMOST want to run right out and get a new truck! Then I think of the payments and.... :shrug:

But, it's clearly NOT the same thing as the overdrive button. That only locked out 4th gear. As far as I can tell, nothing else changed.

They could have easily set the A/F ratio a bit richer too, as long as they stayed within EPA guidelines.

And, shotgun, super research! Good on you!

- Jack

[martinoledad]

ok thanks for the info

so is the overdrive automatically on

[shotgun]

ok thanks for the info

so is the overdrive automatically on

You're welcome.

Based on my towing experience, yes it is. When I'm towing my 4000 lb boat on level roads, I have seen the same RPMs (around 1800 at 65 mph) as when I'm not towing. However, it does take longer on a flat road (with steady throttle position) to get to OD and it doesn't take much additional throttle to get it to drop out.

Note that I do have a 3.73 LS rear end.

[martinoledad]

i have the same rear end

[88Racing]

Even a blind squirrel finds a nut once in a while. :giggle:

Do you think they change the AFR too (richer)? :shrug:
In GM's they don't.
Alls it boils down to is different shift strategies and torque management that are both electronically controlled.

[Jackpine]

You're welcome.

Based on my towing experience, yes it is. When I'm towing my 4000 lb boat on level roads, I have seen the same RPMs (around 1800 at 65 mph) as when I'm not towing. However, it does take longer on a flat road (with steady throttle position) to get to OD and it doesn't take much additional throttle to get it to drop out.

Note that I do have a 3.73 LS rear end.

Is there a way to lock the OD out? Possibly a D1, D2 position for the shifter? I can see how this would be desirable if the transmission was constantly shifting up and down. But, I've never been one to subscribe to the adage: "Don't tow with the OD on." If lower gears aren't needed, might as well save gas.

- Jack

[shotgun]

Based on the manual, there doesn't appear to be a way to disable OD without limiting the transmission to 3rd, 2nd, or 1st.

D (Overdrive) with Tow/Haul On
The Tow/Haul feature improves transmission operation when towing a trailer or a heavy load. All transmission gear ranges are available when using Tow/Haul.
Tow/Haul can be activated by pressing the transmission control switch on the end of the gearshift lever (column-shift transmission) or on the side of the gearshift lever (floor-shift transmission).

Tow/Haul delays upshifts to reduce frequency of transmission shifting. Tow/Haul also provides engine braking in all forward gears when the transmission is in the D(Overdrive) position; this engine braking will slow the vehicle and assist the driver in controlling the vehicle when descending a grade.

3 (Third)
Transmission operates in third gear only.
Used for improved traction on slippery roads. Selecting 3 (Third) provides engine braking.
2 (Second)
Transmission operates in 2nd gear only.
Use 2 (Second) to start-up on slippery roads or to provide additional engine braking on downgrades.
1 (First)
Transmission operates in 1st gear only.

Provides maximum engine braking.

Allows upshifts by moving gearshift lever.

Will not downshift into 1 (First) at high speeds; allows for 1 (First) when vehicle reaches slower speeds.