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Old 05-28-2013, 08:09 PM   #1
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overdrive

on my F150 (Triton V8 5,4) I would turn the overdrive off when traveling the mountains of western North Carolina / Eastern Tennessee. I now have a F350 7.3 diesel power stroke with turbo do I need to turn off the overdrive on it? It runs better with the overdrive on.
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Old 05-28-2013, 08:29 PM   #2
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Jeff, you may ask on the power stroke section, but personally I'd leave it on...
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Old 05-28-2013, 08:42 PM   #3
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leave it on. The transmission is designed for heavy use using OD. In fact, this transmission has all forward clutch's engaged in OD. If you find that the transmission is shifting in and out a lot, cancel OD until the roads smooth out.
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Old 05-29-2013, 04:56 AM   #4
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Very cool Thank you for the great answers and sitting my mind at ease that I am doing the right thing leaving the OD on .
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Old 05-29-2013, 05:17 AM   #5
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Jeff,

I have a 2000 F250 with the Power stroke that just turned 203K. I have pulled various 5th wheels even a loaded toy hauler when we lived in Colorado and traveled throughout the Northwest. I never turned the Overdrive off and have never had any tranny problems. Main consideration is do not 'lug' it in OD and if you do a lot of pulling in the mountains, I would suggest you invest in an EGT gauge to prevent prolonged periods of hot exhaust gas temps during hard upgrade pulls; a few minutes above 1200 degrees will burn up your turbo according to the mechanic who installed mine. They have a factory OE that mounts handily on the driver door frame.

Happy Rv'ing.
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Old 05-29-2013, 07:27 PM   #6
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OD is just fourth gear. I think .73:1 ratio, that's why it's "over"drive. So just turn it off if you're hunting gears and keep your RPM in the 2000-2100 RPM range. That's where mine is best.
EGTs are nice, but stock isn't such a big deal. I'd be WAY more worried about trans temp.
A good cooler and modified valve body help.
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Old 05-30-2013, 07:43 AM   #7
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Main consideration is do not 'lug' it in OD and if you do a lot of pulling in the mountains, ...
Lugging a diesel engine is a huge no no, but you cannot lug a SuperDuty PowerStroke with automagic tranny. The PCM (computer) will force a downshift before it will allow the engine to lug. Stick shifters are different. They are the folks that have to be concerned with downshifting before the engine begins to lug.

With automatic tranny in a SuperDuty PowerStroke, put it in drive and don't worry about it. The only exception is hill country where the tranny constantly downshifts then upshifts then downshifts again for up the hill and down the other side then up the next hill. For trucks less than 10 years old, there is no OD kill button, so use the tow-haul mode and that will minimize downshifting and upshifting for every hill on the road. For older 7.3L PowerStrokes with 4R100 tranny, manually kill OD with the OD button until you get out of the hill country.
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Old 05-30-2013, 10:20 AM   #8
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Does a 7.3L PSD have the PCM?
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Old 05-30-2013, 10:22 AM   #9
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Does a 7.3L PSD have the PCM?
Joe

Yes, it has a PCM (powertrain control module) for transmission and engine functions. It also has an IDM (injector driver module) for the actual control of the fuel injectors after the PCM gives the command to duty cycle the injector.
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Old 05-30-2013, 10:23 AM   #10
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Thanks, I thought all that started with the 6.0L.
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Old 05-30-2013, 10:27 AM   #11
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Thanks, I thought all that started with the 6.0L.

No problem. On the 6.0L they do not have a IDM, something similar but it is called a FICM (fuel injector control module). Basically the same thing.
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Old 05-30-2013, 06:36 PM   #12
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Any computer controlled motor has a PCM of some sorts. Just the computer that controls the engine.
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