• Welcome Visitor! Please take a few seconds and Register for our forum. Even if you don't want to post, you can still 'Like' the posts that you read.

2008 350 superduty v10 transmission problem


jimsea

New member
Joined
Oct 20, 2007
Messages
22
Reaction score
1
Points
3
Age
85
Transmission
Automatic
Just got this 2008 with a v10 that has the tow/haul feature, seems when I am in cruise control it goes automatically to tow/haul as there is no difference
in down shifting weather I select tow/haul or not. When I am out of cruise control it works fine, select tow/haul and it downshifts for compression brakes out of tow/haul it does not downshift. I am hoping this is some small adjustment?
 


Rock Auto 5% Discount Code: 4FF3E9EEA14805 Expires: October 1st, 2020

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
6,850
Reaction score
2,015
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
Alot of newer vehicles will use the transmission to help control downhill speed with the cruise on. My guess is its supposed to be doing that
 

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
33,661
Reaction score
2,780
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
Normal operation. The cruise control computer really only has access to the throttle controls and the trans shift schedule, it has no way of applying the brakes, so if it needs to slow the truck down all it has is engine braking.
 

jimsea

New member
Joined
Oct 20, 2007
Messages
22
Reaction score
1
Points
3
Age
85
Transmission
Automatic
Sorry did someone say something about using the brakes to slow down, I spoke of compression brakeing, witch means using the engine to slow down, why are you bringing up applying the brakes?
 

Dirtman

Custom Text Here
Supporting Member
Joined
May 28, 2018
Messages
11,910
Reaction score
6,936
Points
113
Location
41N 75W
Total Lift
It's up there.
Total Drop
It's down there.
Tire Size
Round.
For funzies...
 

adsm08

Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
Joined
Sep 20, 2009
Messages
33,661
Reaction score
2,780
Points
113
Location
Dillsburg PA
Vehicle Year
1987
Make / Model
Ford
Engine Type
4.0 V6
Engine Size
4.0
Transmission
Manual
2WD / 4WD
4WD
Tire Size
31X10.50X15
Sorry did someone say something about using the brakes to slow down, I spoke of compression brakeing, witch means using the engine to slow down, why are you bringing up applying the brakes?
I don't know if I should bother explaining it again, since you clearly didn't understand the first time, or just write you off as not able to understand.

The cruise control CAN'T USE THE BRAKES so it has to use compression braking if it needs to slow the vehicle, so you will notice more compression braking when using cruise control.
 

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
6,850
Reaction score
2,015
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
Basically the cruise control is only "wired" into the throttle and transmission control. It only has power over those.

It has no power over the brake pedal. So therefore the cruise uses what it can control (throttle and trans) to slow you when needed.
 

jimsea

New member
Joined
Oct 20, 2007
Messages
22
Reaction score
1
Points
3
Age
85
Transmission
Automatic
The question was in regards to the tow/haul feature in the v10 transmission that changes the shift points in the transmission
 

rusty ol ranger

2.9L Mafia-Don
Supporting Member
Joined
Sep 22, 2007
Messages
6,850
Reaction score
2,015
Points
113
Location
Michigan
Vehicle Year
1987
Make / Model
Ford
Engine Type
2.9 V6
Engine Size
177 CID
Transmission
Manual
2WD / 4WD
2WD
My credo
A legend to the old man, a hero to the child...
More then likely its functioning properly.
 

jimsea

New member
Joined
Oct 20, 2007
Messages
22
Reaction score
1
Points
3
Age
85
Transmission
Automatic
Thank you as you can see I don't post very often, there is always an expert who starts off with an innuendo about your mental capacity and then precedes to give you an answer that has nothing to do with the question, I visit frequently in general I can get my answers through search and reading and will continue to come to this forum for good information on my Ranger and now my E350 Super Duty van
 

Dsetz

Member
Joined
Aug 16, 2019
Messages
96
Reaction score
28
Points
18
Age
35
Location
Montana
Vehicle Year
1984
Make / Model
Ford Ranger
Engine Type
2.8 V6
Transmission
Manual
2WD / 4WD
4WD
Not sure I've ever ran both Tow and Cruise at the same time. Sounds like a gear hunting nightmare.
I don't believe the difference in shift points is very noticeable in these trucks. Unless you run tow/haul empty and watch your mpg(its worse).
 
Last edited:


Top