Tow/haul
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In my truck it locks out 5th and 6th (overdrive gears).
Some benefits I could think of is better performance since tow/haul sends shift points further in the RPMs. Another benefit could be slow speed driving (parking lots stop and go traffic) in tow/haul your transmission shouldn't do a lot of gear jumping from a low gear to a really high gear when you let off the throttle. These are just my thoughts not sure how true they are, hopefully someone can verify my thinking.
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You are both correct. Tow/haul mode significntly improves the shift points and T/C lockup on the 68rfe. Most people here on the forums run T/H at all times, loaded and unloaded.
I' am running the H&S overdrive software and also utilize t/h mode. The truck shifts like a built transmission. Firm crisp shifts, T/C lockups almost instant after each shift and the shift points are higher during WOT conditions.
If I'am not mistaken, T/H mode also boosts the line pressure in the transmission as well.
I' am running the H&S overdrive software and also utilize t/h mode. The truck shifts like a built transmission. Firm crisp shifts, T/C lockups almost instant after each shift and the shift points are higher during WOT conditions.
If I'am not mistaken, T/H mode also boosts the line pressure in the transmission as well.
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Correct! You definitely don't want to be lugging around when driving around ton. I'd much rather have the higher shift points and higher rpm's while city driving.
You beat me to this question as I'm wondering the same thing.
Just a little update, I drove to work this morning with tow/haul and exhaust brake on, and it did shift into 5th and 6th. Truck felt like a different animal it didn't fell like I was driving an 8,000 pound truck. Also truck slowed down so quick with normal foot brake input it about put me into the windshield.
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I've tested locking out 6th in town and fuel mileage. The mileage is a little better using 6th but the truck feels much better in 5th. I'll run all the way up to 60 in 5th. I am running 35s though so my final drive gearing is slightly higher than a normal truck on stock tires with 3.73.
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I decided to use the tow/haul mode going home from work, it did seem to have a little more pep and the engine brake seemed a little stronger than with the tow/haul turned off, I think I will run it that way for a while.
Souldnt matter in either drive works the same in both for me. I would use tow/haul, and depending on how the truck acts with EB leave it off.
I say that because the EB might cause the wheels to slip and spin in snow. Using tow/haul should help keep the RPMs up when pushing a heavy amount.
If going between 50-60MPH I would keep tow/haul off. I have found that it will stay in 5th until you get to about 60 then it will shift. Tow/haul is good in the city but it would be better if it would stay in the higher RPMs alittle more sometimes it shifts to quick for me.
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I've used tow haul in my 2nd, 3rd and 4th Gen trucks. It shifts into the next gear quicker and I believe works the transmission more efficiently.
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I use t/u always, it will keep the trans from shifting into 5&6 at 40mph or at 1000rpm which will save your OD clutches. These trucks have too much torque to put on them at low speeds and rpm. I lock out 6th except on highways and freeways over 50mph
If you could disable ABS it will turn trac control off, it works off of ABS. There maybe a fuse to disable trac control but the government prob mandates that its computer controlled.
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