Heavy hauling with automatics 5r110 - Ford Powerstroke Diesel Forum
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post #1 of 20 Old 02-21-2011, 12:59 PM Thread Starter
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Heavy hauling with automatics 5r110

I will be driving coast to coast with a 32ft trailer. The tow haul button obviously keeps it out of O/D and that work great running around town with a trailer but going cross country on the interstate 65 -70 mph can you let it pull in O/D? I wish I had the 6 speed

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post #2 of 20 Old 02-21-2011, 01:05 PM
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Tow/Haul doesn't keep it from going into O/D, it just delays the shift points and makes it engage later. I tow with mine in O/D on the Interstate all the time and never have an issue. Trans. temp. has never gotten over 140*-160*
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post #3 of 20 Old 02-21-2011, 02:01 PM
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I tow a 10,000 5th wheel. When the roads are not too steep I will drive in 5th on the highway. I get ~13.5mpg in 5th and ~10mpg in 4th.

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post #4 of 20 Old 02-21-2011, 02:05 PM Thread Starter
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post #5 of 20 Old 02-21-2011, 02:38 PM
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tow haul is not an over drive lock out, it changes the convertor lock and changes shift points, turn it on and leave it on


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post #6 of 20 Old 02-21-2011, 02:39 PM
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Yeah towing in O/D is not what hurts the tranny as long as it isn't just slamming in and out of O/D all the time (going up hills, etc). Once you're in motion and up to cruising speed and it isn't going in and out of O/D it's good
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post #7 of 20 Old 02-21-2011, 03:33 PM
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Steve, how do you tow in 4th? You got a 6 speed right?


Like Doug and mustang man have said, the tow/haul option specific to the torqueshift holds each gear longer and locks the converter at different points. Also correct me if I'm wrong but wouldn't line pressures etc be modified as well? But never the less, it has absoluetely nothing to do with turning off overdrive. I haul with mine in that mode and it works beautifly. Also comes in handy in strong winds with my lift and 38s, it kept the converter locked and prevented down shifting. I don't worry about that anymore since I'm tuned now.

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post #8 of 20 Old 02-21-2011, 05:08 PM
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Quote:
Originally Posted by Ironmover View Post
Steve, how do you tow in 4th? You got a 6 speed right?
No I have the 5 speed 5R110

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post #9 of 20 Old 02-22-2011, 02:19 PM
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Steve, I'm pretty sure you're incorrect that you are manually selecting and running in fourth. The Tow/Haul selection does not select a different gear when it is in use. It holds each (all 5 gears) longer and higher all directly related to load, throttle position and speed. Also the the torque converter lock-up points come in differently. It does not matter what "mode" you are running, they both will utilize 5th gear or whichever gear is appropriate for the current throttle position and speed with absolutely no influence from either mode. The transmission does not shift and rpm's do not not change when either mode is selected. Your owners manual will explain this also in much more detail as to speeds etc.......




Also, just a thought that came across my mind, there are quite a few posts on here varying from cold starts/surging to trans related questions that say that 4th isn't used hardly ever under most driving conditions. I know on mine I experience 3 shifts and then my converter locks up. The posts are out there explaining it in better detail, this paragraph was simple a recollection of my memory.

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post #10 of 20 Old 02-22-2011, 02:27 PM
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I usually start with tow mode in town and getting on the tollroads or hwy's but usually hit it off so it will shift. I'm sketchy on running it at 2,500+ rpm's when does it usually shift into high gear?
I've always wondered about this, so glad to have found a thread on it.
It shouldn't matter me having a 7.3 should it, it should still be the same as the 6.0's?

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