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Old 03-15-2014, 07:41 AM   #1
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Tow/Haul on F150

I religiously use the tow/haul button on my F150 when I pull the TT. What the heck does that do anyway? Seems like it may slow me down going downhill but what else? Does it help or hinder my gas mileage? Should I only use it going uphill or downhill?
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Old 03-15-2014, 07:58 AM   #2
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I was interested so I looked it up....
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Old 03-15-2014, 11:16 AM   #3
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As mentioned in 'threebutchers' post, "check your owners manual" because not all "Tow/Haul" selectors function the same.

I ran across this 2009 Ford F-150 description: "Selectable Tow/Haul mode adjusts transmission operation to match towing and hauling demand, reduces gear hunting, improves power delivery and engages engine braking to help control speed when descending hills".

My '02' GM Tow/Haul when engaged raises the shift points (which I like with my 8,500lb TT), but doesn't control engine braking (newer GM models may).

Bob
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Old 03-15-2014, 11:24 AM   #4
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I have both tow/ haul mode and an exhaust break.

I generally turn tow/ haul on while up/ down mountain and back roads, but disengage once on open highway, as mine will suppress overdrive.
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Old 03-15-2014, 12:46 PM   #5
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Quote:
Originally Posted by Jmooney View Post
I have both tow/ haul mode and an exhaust break.

I generally turn tow/ haul on while up/ down mountain and back roads, but disengage once on open highway, as mine will suppress overdrive.
I tow in a similar manner. I use the tow/haul until I get it moving and the torque converter locks-up. Then I usually go back to the normal mode because it won't stay in 6th gear in tow mode below 60. 6th gear is a 2nd overdrive. The engine has HUGE amounts of torque and will pull our 8,000+ lbs of Eagle TT up all but the steepest hills in 6th gear. If I need to downshift, 5th gear (1st overdrive) usually does the job.

One additional point is the downshifting with the exhaust brake is more effective/aggressive in tow/haul.
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Old 03-15-2014, 12:47 PM   #6
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Quote:
Originally Posted by Rustic Eagle View Post
..."Selectable Tow/Haul mode adjusts transmission operation to match towing and hauling demand, reduces gear hunting, improves power delivery and engages engine braking to help control speed when descending hills"...
Works much the same way on the Tundra, provided D is selected on the shifter. If S is selected (allows me to control the gear I'm in) Tow/Haul is shut off.
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Old 03-15-2014, 12:53 PM   #7
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I couldn't imagine towing a TT or FW without the exhaust break
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Old 03-15-2014, 01:32 PM   #8
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I would think there is a difference in how Tow/Haul functions with gassers and diesels.., more effective engine breaking with diesels (?).

Bob
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Old 03-15-2014, 03:27 PM   #9
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For my 2013 F-150, the owners manual states tow/haul should be engaged while traveling up or down hill. It changes the shift points to allow the engine to rev and generate more HP and torque as well as down shifts if required to maintain downhill speed. For the flat areas it states to disengage tow/haul and lock out gears if required. As well tow/haul locks up the torque converter which allows meh transmission to run cooler. Ryan
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Old 03-15-2014, 04:14 PM   #10
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That makes sense. With T/H mode on, and exhaust break on, going downhill from the Eisenhower Tunnel ( 14,000 ft) the truck almost comes to a stop without ever using the brakes. I actually have to accelerate to keep going down hill

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