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Old 04-21-2014, 12:53 AM   #11
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What size wheels/tires are you running?

I can't find it at the moment, but I know I have seen a App Note from Allison regarding changing tire size from the standard 245/75r16 OEM tire size. The gist of note was the Allison 1000 not being able to get to 5th/6th under certain conditions.

If I come across the application note from Allison I'll post it.
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Old 04-21-2014, 08:46 PM   #12
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It's not a good idea to tow in OD. It will cook your tranny even if you run a bigger cooler. The low pressure side of an auto tranny runs a lower volume (GPM) in OD, the OD clutch pack will fry while the trans temp reads normal. Your better off running the motor harder, it will take it. I tried running OD with an F150 gasser few years ago thinking I was going to blow it up running the motor in passing gear for 100 miles, stopped for gas the floor boards were sizzling from the tranny being so hot.
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Old 04-27-2014, 05:21 PM   #13
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I usually don't tow in cruise as it causes the tranny to shift too often. Generally I use a constant foot pressure which seems to greatly improve my mpg. This allows the TV to slow down going uphill and speed up going downhill (within reason). The truck is working basically the same all the time with the variable being vehicle speed. Of course one has to vary this according to conditions.
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Old 04-27-2014, 07:20 PM   #14
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It is my understanding that it is proper to tow in tow haul in od and cruise- I will check with my mechanic and post his opinion- I have towed under these conditions as long as I've had this tv- DD
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Old 04-28-2014, 03:13 PM   #15
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What does tow haul mode do? All that my Tundra seems to do is shift at a higher rpm and it ruins my gas mileage.
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Old 04-28-2014, 04:22 PM   #16
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On my F-150 tow/haul mode will cause the engine to downshift when the breaks are applied so you can use that to help braking. The only issue I found is that if I am going at a night rate of speed the truck wants to downshift to 4th gear and the transmission then sounds awful
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Old 04-28-2014, 04:25 PM   #17
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Quote:
Originally Posted by wwsmith111 View Post
What does tow haul mode do? All that my Tundra seems to do is shift at a higher rpm and it ruins my gas mileage.
Reason for the higher shift points is that's where your power band is. Gas engines have their power and torque at the top of their RPM range, whereas diesel engines have theirs very low. It also holds gears longer so the transmission is not shifting so much. Tow/Haul also locks out your overdrive gear; towing in OD can burn up a tranny in a hurry, and it has very little torque so it's not mean to be used with any kind of load.

Some of these things are always happening while towing, some are only happening sometimes. I tried clicking my tow/haul mode off and on at different times last time we were out, and at some points I didn't really notice much difference because my transmission usually won't go into OD while towing whether I allow it to or not.
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Old 04-28-2014, 04:25 PM   #18
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As a former GM tech, I had a customer with a similar problem on their early D/A. It was fine until you hooked something behind it and drove it 20 or so miles. I was finally able to duplacate it by taking my folks Terry for a 20 mile test drive. At the time, GM/Allison would only allow for fluid and filter changes, if GM tech assist thought it was anything else, you got a new trans. Im not sure if its the same today, but may be worth while finding an Allison transmission specialist.
I also agree with the other post's about being brought back to factory tuning and tire size. Vehicles are very sensitive today and just a small change in things can really cause problems.
GOOD LUCK!
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Old 04-29-2014, 12:29 AM   #19
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Tow/haul changes the shift points so the transmission doesn't shift as much. I always use tow/haul and cruise control when towing. If I have a big hill coming up I just step on the throttle and pick up a little more speed which helps to either delay a down shift or keeps a down shift from happening.
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