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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

E4OD Overdrive Cancel Switch Default

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Old Dec 12, 2006 | 03:25 PM
  #1  
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Question E4OD Overdrive Cancel Switch Default

This should be an easy question for Y'all, I think...

Is there a way to reverse the switch on dash for the E4OD so
that it defaults to no overdrive when I start the truck, and
goes into overdrive when I push it the first time (so that I have
to tell it to go into OD)?

My truck is a 1991 Ford Centurion... basically an F350 crew cab
with 7.5L (460) and 4X4.

I do a lot of driving around town, and the Overdrive is an annoyance,
especially with large tires. I also don't like low RPMS in snow.

Thanks,
Mark kanzler
 
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Old Dec 12, 2006 | 04:32 PM
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just turn it off.

i do not think you can reverse it automatically turning on when vehicle starts.

the computer makes the decision and i have never heard anyone change this feature.
 
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Old Dec 12, 2006 | 05:31 PM
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there is an article in the tech section about
dura trans programmer that will change the on and off of the OD
timing. I have been unable to locate anyone selling
it but it sounds like a godsend for those of us that
do 95% of our truck driving around town
 
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Old Dec 12, 2006 | 05:50 PM
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I like having it on all the time - everytime it shifts into overdrive at 38 mph and sits at 1100 RPMs, I fantasize about all the gas I'm saving.
 
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Old Dec 12, 2006 | 09:43 PM
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I had an idea (and it didn't even hurt) to try a different Google search...
I searched for E4OD switch inverter and got much better results than
before (w/ E4OD overdrive switch reverse):

http://www.google.com/search?num=100...er&btnG=Search

The first one is $189... sounds like a lot for what is probably a very simple device. I could build one myself if I could find out what logic is involved.

Someone posted a circuit to make one (I think) but the image is gone now.
I'll have to try to contact them.
 
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Old Dec 13, 2006 | 10:30 AM
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my switch was for free, i just turn it off when i do not want overdrive on.

saved me $189 plus labor according to you.
 
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Old Dec 13, 2006 | 10:59 AM
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Driving around town at low RPM is hard on the transmission, and I'm not
the only one who drives my truck.

Labor is free at my house!

I should be able to construct the device myself for under $5, and
that's if I don't already have the parts on hand.

I just need to know what the pin-outs on the switch are, which I should
be able to figure out with an ohm meter.

Maybe I'll post the procedure after I get it done and working.
 
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Old Dec 15, 2006 | 03:54 PM
  #8  
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check out this site
dodgeram.org/tech/mods/transmission/od_inverter.html
 
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Old Dec 15, 2006 | 05:09 PM
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I think I actually have figured out a way to do it...
I did see that site, but I have been told that there needs to be a delay
between cranking and when the pulse occurs (or when you push the
OD cancel switch) so that the truck's computer won't think the
OD cancel switch has just shorted itself out.

Combining ideas from the first two URLs, I think it can be done.

http://dodgeram.org/tech/mods/transm..._inverter.html

http://ourworld.compuserve.com/homep...tm#555mono.gif

http://www.intermotive.net/odi1.htm

http://www.intermotive.net/Brochures/DuraTrans.pdf

http://www.intermotive.net/Installat...structions.pdf

Also, a pretty good site:
http://www.eurekaboy.com/f250/index.htm
 
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