TOW / HAUL USE - Page 2 - Diesel Forum

barrelhorses · 08-09-2006, 07:29 PM

O.K., well I guess we learn something everyday. But that last "shift" sure feels like a gear shifting to me.

Springer04 · 08-09-2006, 08:02 PM

The link below from the dieselmann's page has some very good information concerning the workings of the 5r110 (torqshift)transmission.

http://www.intellidog.com/dieselmann/60psd.htm

Casey_1 · 08-10-2006, 08:14 AM

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But that last "shift" sure feels like a gear shifting to me.

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Yes, it does. Didn't I say that it does?

Bigjwalt · 08-10-2006, 08:49 AM

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IMHO, Tow/Haul is good for pulling the heavy stuff, like above 10,000 or 11,000 lbs........It is not needed for 8,500 or less, which is what I pull (big boat).

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Can anyone confirm this? I plan on pulling a trailer under 2,000 Lbs. A light aluminum trailer and 2 snowmobiles should weigh around 1,500 Lbs.

Is the PSD powerful enough that I shouldn't even bother with the tow/haul mode?

Casey_1 · 08-10-2006, 09:30 AM

If you like the way it tows in tow/haul, use it. If you don't, don't use it. The "experts" that say it must be used above a certain weight have no idea of what they are talking about. You are not going to hurt it if you use it or don't use it an ANY tow weight.

Black05 · 08-10-2006, 11:20 AM

Casey is correct. If you find that your truck is hunting for the right gear up an incline while towing, then using tow/haul will assist in keeping it in one gear. Likewise, tow-haul is useful when towing and coming down grades (or stopping at an intersection) as the transmission assists in slowing the truck/trailer down so you do not have to brake as hard.

Casey_1 · 08-10-2006, 12:47 PM

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Casey is correct.

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I sure like to see that! [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img] [img]/ubbthreads/images/graemlins/grin.gif[/img]

Casey is ALWAYS correct! [img]/ubbthreads/images/graemlins/wink.gif[/img] [img]/ubbthreads/images/graemlins/biggrin.gif[/img] [img]/ubbthreads/images/graemlins/biggrin.gif[/img] [img]/ubbthreads/images/graemlins/biggrin.gif[/img]

AllOutFirefighter13 · 08-10-2006, 02:09 PM

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If you like the way it tows in tow/haul, use it. If you don't, don't use it. The "experts" that say it must be used above a certain weight have no idea of what they are talking about. You are not going to hurt it if you use it or don't use it an ANY tow weight.

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Casey,

I'm not disagreeing with what you are saying here, however, IMHO, Tow/Haul makes the engine not work as hard (higher RPMS = more available power) plus it adds more pressure to the tranny internals, letting them theoretically not slip when put under a heavy load (especially less slip between gears due to the added pressure and shortened shift times). I've pulled a certain load (20' dovetail loaded with firewood) both w/o Tow/Haul and w/ Tow/Haul, and I feel that the tranny is being more efficient while working, as well as not sucumbing to the added wear of running it without Tow/Haul. I believe that if you are towing at or near the GCWR while not using Tow/Haul, you are making the engine AND the tranny work harder than it would if you did use Tow/Haul. This is strictly my opinion and is, as always, open to debate. I for one will use Tow/Haul when I think it is necessary. Why wouldn't you use an added function (that you ultimately paid for) that is there to help you?

Bigjwalt · 08-10-2006, 02:56 PM

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Why wouldn't you use an added function (that you ultimately paid for) that is there to help you?

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Good Point!

Black05 · 08-10-2006, 03:09 PM

Casey is ALWAYS correct! [img]/ubbthreads/images/graemlins/wink.gif[/img] [img]/ubbthreads/images/graemlins/biggrin.gif[/img] [img]/ubbthreads/images/graemlins/biggrin.gif[/img] [img]/ubbthreads/images/graemlins/biggrin.gif[/img]

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I guess too much of a good thing ..... Casey is now not correct because Casey is not always correct! [img]/ubbthreads/images/graemlins/biggrin.gif[/img]

Casey_1 · 08-10-2006, 03:14 PM

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plus it adds more pressure to the tranny internals, letting them theoretically not slip when put under a heavy load (especially less slip between gears due to the added pressure and shortened shift times).

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Where did you get that idea? Show me proof that it adds pressure. I happen to know that it does not.

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Why wouldn't you use an added function (that you ultimately paid for) that is there to help you?

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Because some people don't like the way it works. My point is that if you don't like it, don't use it. I bought an entire truck, I can use what I like and not use what I don't like. It isn't going to hurt the truck to not use tow/haul. No need to scare people into thinking that it is bad for the truck to not use tow/haul above a certain weight.

Roger_007 · 08-10-2006, 06:05 PM

I was told at the dealer the torque converter in the 6.0L 2006 locks up early @ around 35 MPH. I was very surprised to heard that since I always thought the torque converter lock'd up as the last thing.

TOW/HAUL only holds off the shifting or gear release so you don't shift too early when pulling. Also, I use TOW/HAUL for going down steep grades even if I don't have a load on the back. For some vehicles it would be the same as taking it out of overdrive, but the Tow/Haul it is more advanced.