1990 e350 overdrive button not turning off
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New User
Joined: Jun 2007
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1990 e350 overdrive button not turning off
New to me 1990 e350 seems to be stuck in overdrive.
The amber button on the dash does not come on, Its slow off the line and sluggish climbing hills.
Going to check the fuse now, but I checked them all the other day and they all were intact.
thanks
The amber button on the dash does not come on, Its slow off the line and sluggish climbing hills.
Going to check the fuse now, but I checked them all the other day and they all were intact.
thanks
Thread Starter
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New User
Joined: Jun 2007
Posts: 21
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Took the switch apart and cleaned things up. Got it functioning with the cover off. Discovered one of the springs for the buttons was missing so I'll look for one of those today and put it back together.
See if thats where atleast part of my issue is. Then Ill move onto the fuel guage, sedning unit, etc (another or combo issue)
See if thats where atleast part of my issue is. Then Ill move onto the fuel guage, sedning unit, etc (another or combo issue)
Mountain Pass
Joined: Jul 2018
Posts: 188
Likes: 13
From: France
I have a 1989 E250, 351 with E40D with the dash button for the overdrive.
Personally, I always leave it ON because I have already read bad stories about this button. I live in a flat country. But when I attack the climb up a hill and the speed drops, I accelerate all the way for the kickdown to work and thus regain the necessary power to the top of the hill. If my speed gets too high before the top, I take my foot off the accelerator a little while trying to prevent the overdrive from engaging again before the top.
This is my way of using the E40D, I don't know if it is good ? Mark, please, what do you think ?
Personally, I always leave it ON because I have already read bad stories about this button. I live in a flat country. But when I attack the climb up a hill and the speed drops, I accelerate all the way for the kickdown to work and thus regain the necessary power to the top of the hill. If my speed gets too high before the top, I take my foot off the accelerator a little while trying to prevent the overdrive from engaging again before the top.
This is my way of using the E40D, I don't know if it is good ? Mark, please, what do you think ?
Logistics Pro
Joined: Oct 2014
Posts: 3,677
Likes: 172
What about the AOD Mark? There are a lot of roads around here where i might drive 45 to 55 MPH for 4 to 6 miles. I put mine in OD on most of those roads and feather the gas when needed to keep it from shifting down. We have very little traffic around here and sometimes if i have to slow to nearly 35 MPH, I can slowly bring it back to 55 without ever down shifting. If the road is under a couple of miles then I just leave it in D. Also to make that shift from D to OD, I will sometimes let off of the throttle just enough for the transmission to shift to OD. I do that thinking that it is less strain on the OD band?
I have heard some people recommend staying in D and only using OD on the highway for long distances.
I have also read that the AOD can be beefed up if needed?
Thanks
I wonder how much trouble it would be to convert an 88 with AOD to a E4OD
I have heard some people recommend staying in D and only using OD on the highway for long distances.
I have also read that the AOD can be beefed up if needed?
Thanks
I wonder how much trouble it would be to convert an 88 with AOD to a E4OD
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,717
Likes: 2,642
From: SE Florida
The AOD was not as tough as the E4OD. I think what you described won't hurt it. Any transmission can be beefed up.
To convert to an E4OD you'll need a stand alone controller since no 1988 vehicle has a PCM that can shift an E4OD. You will also need to modify the cross-member because the E4OD is longer. And you'll need to shorten the driveshaft.
To convert to an E4OD you'll need a stand alone controller since no 1988 vehicle has a PCM that can shift an E4OD. You will also need to modify the cross-member because the E4OD is longer. And you'll need to shorten the driveshaft.
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