Torqshift Tow/Haul
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Senior User
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Torqshift Tow/Haul
Is there anyone that can tell me what all the tow/haul mode on the torqshift does? Other than the obvious shift point changes and engine braking, is there anything else? A friend of mine pulls a backhoe almost all the time with his 06 F-350 psd and he only uses the tow/haul to slow down. The lower rpm's put him in the torque band and he realizes a lot better fuel economy. I've been told that in GM trannys the tow/haul engages more clutches. This makes me wonder if all of us towing without using the tow/haul on the fords aren't costing ourselves more than we are saving. What does everyone else think? You guys are a great help and I appreciate your opinions and knowledge.
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Joined: Dec 2006
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From: New Jersey
Maybe the tech's can tell you better, but to my knowledge, the tow haul mode only does what you describe. The advantage to holding the shiftpoints higher would be 1. so that you dont lug the engine with a load on it. 2. Higher line pressure will prevent transmission slippage, which causes heat, hence transmission failure. You can be slightly slipping a trans without even knowing it and once the damage is done it's too late. Tow haul was put in there by Ford engineers for a reason and should be used when towing or hauling heavy loads. You hit the nail right on the head yourself when you said, "This makes me wonder if all of us towing without using the tow/haul on the fords aren't costing ourselves more than we are saving." A few more pennies for fuel now verses 4 grand or so for a new tranny later.
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I hardly ever haul much with mine, and when I do its not a whole lot. I don't like to see a good buddy tearing up his investment though. Sounds like we are damn near twins, I have an 06 F-350 thats dark stone. I just have the XLT package and I'm sitting on 18's. I appreciate your input. That's kind of what common sense would tell a guy to do I would think, I was just wondering what everyone else thought. Thanks man.
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Thanks for your opinions guys, I appreciate it. Do you guys know anything about the tow/haul on the allison? I'm wondering if the extra clutches rumor I have heard is fact, just for personal info. I don't know much about this stuff but I own it, therefore I want to know what's going on. Thanks again guys.
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Joined: Sep 2006
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From: Santee, CA
A co-worker of mine has an '07 D-Max and from his description, the Alison works almost exactly the same as the TorqueShift. Have no idea if internally it is doing things differently, but from an operational standpoint, they are nearly twins. The chagne to shift points, lockup, hold on deceleration, and also the auto downshift when decelerating and tap on brake - all nearly the same. Also one other fact that not many people know, the TorqueShift is a 6 speed (no typo). During its upshift, it skips 4th gear. When in real cold conditions, it will use 4th and skip 5th. So most driving you will only see 5 gears. During a hard pull, you will actually see all of them. Start pulling a good hill to where it will downshift out of overdrive (6 to 5th gear). If you pull hard enough of step on the throttle enough to down shift again, you will notice only about 300 RPM gain. That is the true 4th gear.
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What little we have pulled with our 2 Fords, me and dad have both thought there was an extra gear in there somewhere. I have heard a few different explanations but I never heard that they were actually 6 speeds, until I got on here. Thanks for the info.
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From: Santee, CA
No problem. As an FYI below are the transmission gear ratios. When you look at how close 4th and 5th are you can understand the logic of skipping on, especially considering the power these engines have.
1st - 3.09
2nd - 2.20
3rd - 1.54
4th - 1.09
5th - 1.00
6th - 0.71
1st - 3.09
2nd - 2.20
3rd - 1.54
4th - 1.09
5th - 1.00
6th - 0.71
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Haha, no kidding. That explains the 300 rpm difference as well. No kidding on the power as well, after using these on the farm and can't think about going back to the "good ole days" and have an older diesel or a gasser. We had a V10 once, excellent power for a gas i must say, but it would almost collapse the sides of the gas tank. Thanks for the numbers, i appreciate it.
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Joined: Feb 2007
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Originally Posted by EZ-Ford
No problem. As an FYI below are the transmission gear ratios. When you look at how close 4th and 5th are you can understand the logic of skipping on, especially considering the power these engines have.
1st - 3.09
2nd - 2.20
3rd - 1.54
4th - 1.09
5th - 1.00
6th - 0.71
1st - 3.09
2nd - 2.20
3rd - 1.54
4th - 1.09
5th - 1.00
6th - 0.71
Senior User
Joined: Sep 2006
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From: Santee, CA
I would agree that the double overdrive would be nice while not towing, however I have to question its usefulness with a good load on?? Since the PSD will cruise nice at 2000RPM at 70MPH (3.73 rear end), a higher gear would drop the MPH and thus MPG also, but would probably not be much use when towing. Unless that is you were then able to go with the 4.10 instead of 3.73 and maybe have the best of both worlds. All a little subjective at this point since I have not driven a Duramax (and don't really plan on it, I love this PSD). Below are listed the trans gear ratios for both trucks. You will see that the Allison is generally a little higher geared all the way through. One additional thought, on a PSD we can always add on an OD unit (like Gear Vendors, I have also listed their final ratio below) and it would split all the gears. It is not even offered for the DMax.
Boy, those sure didn't line up very good. Lets try that again...
Gear---PSD---DMax
1------3.09---3.10
2------2.20---1.81
3------1.54---1.41
4------1.09---1.00
5------1.00---0.71
6------0.71---0.61
GV-OD-0.55
Boy, those sure didn't line up very good. Lets try that again...
Gear---PSD---DMax
1------3.09---3.10
2------2.20---1.81
3------1.54---1.41
4------1.09---1.00
5------1.00---0.71
6------0.71---0.61
GV-OD-0.55
Last edited by EZ-Ford; May 10, 2007 at 11:35 AM.
New User
Joined: Feb 2007
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Originally Posted by EZ-Ford
I would agree that the double overdrive would be nice while not towing, however I have to question its usefulness with a good load on?? Since the PSD will cruise nice at 2000RPM at 70MPH (3.73 rear end), a higher gear would drop the MPH and thus MPG also, but would probably not be much use when towing. Unless that is you were then able to go with the 4.10 instead of 3.73 and maybe have the best of both worlds. All a little subjective at this point since I have not driven a Duramax (and don't really plan on it, I love this PSD). Below are listed the trans gear ratios for both trucks. You will see that the Allison is generally a little higher geared all the way through. One additional thought, on a PSD we can always add on an OD unit (like Gear Vendors, I have also listed their final ratio below) and it would split all the gears. It is not even offered for the DMax.
Gear PSD DMax
1 3.09 3.10
2 2.20 1.81
3 1.54 1.41
4 1.09 1.00
5 1.00 0.71
6 0.71 0.61
GV-OD 0.55
Gear PSD DMax
1 3.09 3.10
2 2.20 1.81
3 1.54 1.41
4 1.09 1.00
5 1.00 0.71
6 0.71 0.61
GV-OD 0.55
Tuned
Joined: Mar 2007
Posts: 305
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From: Havana Fla
I just traded in my 01 durramax/allison on my 07 PSD. both trucks Crewcab/4x4/shortbox/same tool boxes ect.
The chevy had an edge chip set at level3. the ford is stock.The chevy had an add on brake controller,the ford has the factory intergrated unit. My forklift weighs in at around 11,000 lbs the trailer is almost 3,000 lbs the equipment I hauled to Ga yesterday was 1000lbs on trailer,400 in truckbed. The ford pulled,stopped,and rode better than the chevy with out a doubt. I dont check fuel mileage so I have no idea wich one did better, but the safer feeling in the ford was worth a gallon or 2 of diesel.
I had it in tow/haul the whole time with both trucks. The allison used to downshift HARD when in tow mode the ford was much smoother.
The chevy had an edge chip set at level3. the ford is stock.The chevy had an add on brake controller,the ford has the factory intergrated unit. My forklift weighs in at around 11,000 lbs the trailer is almost 3,000 lbs the equipment I hauled to Ga yesterday was 1000lbs on trailer,400 in truckbed. The ford pulled,stopped,and rode better than the chevy with out a doubt. I dont check fuel mileage so I have no idea wich one did better, but the safer feeling in the ford was worth a gallon or 2 of diesel.
I had it in tow/haul the whole time with both trucks. The allison used to downshift HARD when in tow mode the ford was much smoother.
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Joined: Feb 2007
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Originally Posted by firemanpat29
I just traded in my 01 durramax/allison on my 07 PSD. both trucks Crewcab/4x4/shortbox/same tool boxes ect.
The chevy had an edge chip set at level3. the ford is stock.The chevy had an add on brake controller,the ford has the factory intergrated unit. My forklift weighs in at around 11,000 lbs the trailer is almost 3,000 lbs the equipment I hauled to Ga yesterday was 1000lbs on trailer,400 in truckbed. The ford pulled,stopped,and rode better than the chevy with out a doubt. I dont check fuel mileage so I have no idea wich one did better, but the safer feeling in the ford was worth a gallon or 2 of diesel.
I had it in tow/haul the whole time with both trucks. The allison used to downshift HARD when in tow mode the ford was much smoother.
The chevy had an edge chip set at level3. the ford is stock.The chevy had an add on brake controller,the ford has the factory intergrated unit. My forklift weighs in at around 11,000 lbs the trailer is almost 3,000 lbs the equipment I hauled to Ga yesterday was 1000lbs on trailer,400 in truckbed. The ford pulled,stopped,and rode better than the chevy with out a doubt. I dont check fuel mileage so I have no idea wich one did better, but the safer feeling in the ford was worth a gallon or 2 of diesel.
I had it in tow/haul the whole time with both trucks. The allison used to downshift HARD when in tow mode the ford was much smoother.