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Old 07-16-2012, 11:23 PM   #1
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I have a 2003 F250 with a Triton V10. I've heard that running in overdrive and pulling a trailer is hard on the transmission, is this true?
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Old 07-16-2012, 11:34 PM   #2
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In my old Dodge I would run in OD as long as the transmission was not hunting for gears. If I was running in hilly areas Ilocked it out of OD. When we went to New Mexico a few years ago I had it in OD on I10 going through flat West Texas and never saw higher trans temps than not running in OD. Now this new Chevy I bought with the 6 speed Allison I will have to do some reading up on to see what is best to run in while towing.
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Old 07-16-2012, 11:44 PM   #3
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We had a MH with the V10. The owners manual should tell you what to do when towing.

Unless they have changed things on the Allison trans.-- they say use the tow haul mode.



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Old 07-16-2012, 11:59 PM   #4
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I pull in OD, unless the transmission starts to shift in and out of overdrive frequently, then I lock out the OD. With my setup I can stay in overdrive most of time without any differences in temps for the motor or trans. If either start to heat up I lock out OD. Tow haul mode only changes your shift points to a higher rpm and gives you a good thump when it shifts. I always use tow/haul mode when pulling and sometimes after a Nascar race!!!
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Old 07-17-2012, 12:15 AM   #5
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overdrive is just what it says.The engine is turning slower than the drive shaft. This really reduces your torque. When the GM 400 tranny shifts, it actually shifts down 2 gears so your RPM is higher than running in 3rd. I run in 3rd all the time when towing. I can tell no difference in mph and the temp readings stay under 200 unless I am in the mountains.
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Old 07-17-2012, 01:27 AM   #6
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As far as I know, on my Ford with the 5 speed tranny, you can't lock out OD. Tow/Haul manages the shift points and gear selection based on load requirement. The only other choice is to take it out of drive, but then you only get 3rd gear as top choice and it locks you in that gear. So I just run in tow/haul and OD most of the time.
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Old 07-17-2012, 06:43 AM   #7
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My Duramax/Allison combo recommends Tow/Haul when towing. I nevertow without being in T/H mode. In my model year it works inconjunctionwith the cruise control to help maintain downhill speed. Newer models like Keith's 2012 have an engine brake.
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Old 07-17-2012, 09:13 AM   #8
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Most tow haul modes will lock out overdrive. Mine locks out 6th gear.
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Old 07-17-2012, 10:00 AM   #9
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All chebby owners reply? HA that is funny.. (except one)

Hard on the transmission? NO !.

We don't have 6 gears in our older ford f250's.. We have, um lets see if i can remember because i just put it go gear,, 1-2-3-tc_lock,OD (with my chip, 1, 2, tc_lock, 3, od) I can't remember when i have ever hit that button to lock out OD.. I don't think i have ever or will.. Every ford car, SUV, Truck, that i have owned, I am a total (older stuff) ford guy.. For the life of me i can't figure out why they would even give us that button. I have never, ever used it..

And for the sake of conversation, A lady came up to me today, Wierd, She said her and her husband is taking in her ford explorer to get fixed.. The green "OD" light is on, What does that mean. I told her to have her husband call me, Which he did.. I told him to hit the button to turn it off.. So it appears they never used it either and accidentally bumped it... I told this lady to send me the $80 check (just kidding on that $)

I have 373 gears in my tuck, And i have pulled just about everything under the sun. Put that 03 in gear and go.. If your going up a long grade hill, Hit the button if you want to rev your motor to the moon and blast up that hill at 5mpg, but i just let it slow down and muscle up. Nice and easy.. Getting there is better than not getting there.















Edited by: danskool
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Old 07-17-2012, 12:07 PM   #10
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Are you certain the T/H mode on the Allison transmission locks out 6th gear? I do not think it does, at least on my Duramax. I still cruise at 63 in T/H with the tach on 1,700 - 1,800 and RV hitched. It is my understanding that T/H changes the shift time, i.e., higher RPMs per gear based on the load. I get all six gears (five shifts) when towing.
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