Tow Haul
Thread Starter
|
Freshman User
Joined: Jun 2011
Posts: 27
Likes: 0
Tow Haul
After receiving so much help on my IBC issues I thought Id try one more issue.
2005 f350 6.0 4x4
having an issue with my Tow/Haul. it works fine up to 55mph, hit the tow/haul to turn it on and rpms jump around 300 or so, hit it again and it turns off and RPM's drop back down. But as soon as I get above 55mph and hit the tow/haul nothing happens, tow/haul indicator comes on but no jump in RPM's.. The RPM's are already higher than they used to be, at 65mph the rpms use to be around 1200/1400, then would jump up when the tow/haul was turn on. now at 65mph the RPM's are at all ready at 1800.
Ford says nothing is wrong, I went for a drive with the Tech, he had a computer hooked up to the truck and watched the transmission, I showed him what I was talking about and he siad "I see what you mean, but the tranny is doing exactly what it is told".
Any thoughts
2005 f350 6.0 4x4
having an issue with my Tow/Haul. it works fine up to 55mph, hit the tow/haul to turn it on and rpms jump around 300 or so, hit it again and it turns off and RPM's drop back down. But as soon as I get above 55mph and hit the tow/haul nothing happens, tow/haul indicator comes on but no jump in RPM's.. The RPM's are already higher than they used to be, at 65mph the rpms use to be around 1200/1400, then would jump up when the tow/haul was turn on. now at 65mph the RPM's are at all ready at 1800.
Ford says nothing is wrong, I went for a drive with the Tech, he had a computer hooked up to the truck and watched the transmission, I showed him what I was talking about and he siad "I see what you mean, but the tranny is doing exactly what it is told".
Any thoughts
FTE Leadership Emeritus
Joined: Sep 2000
Posts: 23,174
Likes: 1,678
From: Stephensville WI
That sounds like normal behavior.
Tow/Haul mode changes the shift map. What you are seeing at 55 MPH with T/H activated sounds like the converter unlocking, or possible a downshift. Either way, the computer is telling the transmission to do this because that is what the T/H map says should happen at that RPM/Load/Throttle position. At 65 MPH, the map for T/H and normal mode agree on the gear you should be in, so nothing happens as you shift in and out of T/H mode.
One tow on my truck, towing about 9000 pounds into a stiff headwind, my truck would not shift into high gear at 55 MPH in T/H mode. Increasing my speed to 60 allowed the transmission to shift into high and allowed the RPMs to drop.
Tow/Haul mode changes the shift map. What you are seeing at 55 MPH with T/H activated sounds like the converter unlocking, or possible a downshift. Either way, the computer is telling the transmission to do this because that is what the T/H map says should happen at that RPM/Load/Throttle position. At 65 MPH, the map for T/H and normal mode agree on the gear you should be in, so nothing happens as you shift in and out of T/H mode.
One tow on my truck, towing about 9000 pounds into a stiff headwind, my truck would not shift into high gear at 55 MPH in T/H mode. Increasing my speed to 60 allowed the transmission to shift into high and allowed the RPMs to drop.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,651
From: SE Florida
Above about 55 MPH there is no difference in operation with tow/haul on or off. There doesn't need to be a change in RPM with tow/haul on at that speed. All that could do is burn more fuel.
Thread Starter
|
Freshman User
Joined: Jun 2011
Posts: 27
Likes: 0
not true
I good friend I work with has the same truck, both f350 6.0's 2005 crew cabs, Same exact truck just a different color. His truck does not act this way.
at 65mph with T/H off his RPMs are down under 1400. So something has changed
Post Fiend
Joined: Oct 2002
Posts: 11,314
Likes: 4
IIRC, I've only noticed at about 1600 rpms
( since that is the advertised torque curve)
that mine runs about 1600 rpms or so without tow/haul....
oops sorry - the jury will ignore that outburst
wrong year truck !
( since that is the advertised torque curve)
that mine runs about 1600 rpms or so without tow/haul....
oops sorry - the jury will ignore that outburst
wrong year truck !
Laughing Gas
Joined: May 2008
Posts: 939
Likes: 1
From: Central Kansas
12 months ago when I would be driving at 65mph, I would be pulling some where around 1250-1350 RPMs with the T/H off, now under those same condtions Im pulling 1800. something has changed.
I good friend I work with has the same truck, both f350 6.0's 2005 crew cabs, Same exact truck just a different color. His truck does not act this way.
at 65mph with T/H off his RPMs are down under 1400. So something has changed
I good friend I work with has the same truck, both f350 6.0's 2005 crew cabs, Same exact truck just a different color. His truck does not act this way.
at 65mph with T/H off his RPMs are down under 1400. So something has changed
Are the gears the same in your friend's truck?
Thread Starter
|
Freshman User
Joined: Jun 2011
Posts: 27
Likes: 0
No, this has nothing to do with the trailer, all speeds and rpm's given are when I'm NOT pulling a trailer
Trending Topics
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
12 months ago when I would be driving at 65mph, I would be pulling some where around 1250-1350 RPMs with the T/H off, now under those same condtions Im pulling 1800. something has changed.
I good friend I work with has the same truck, both f350 6.0's 2005 crew cabs, Same exact truck just a different color. His truck does not act this way.
at 65mph with T/H off his RPMs are down under 1400. So something has changed
I good friend I work with has the same truck, both f350 6.0's 2005 crew cabs, Same exact truck just a different color. His truck does not act this way.
at 65mph with T/H off his RPMs are down under 1400. So something has changed
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
