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My overdrive light flashes constantly and the shifts from 1-2 and 2-3 shift hard.. Also the downshift is pretty hard when im rolling to a light.. Does anyone know what could be going on??? I appreciate anyone's input..
 

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You need to scan it for codes before you blow it up.... It could be a VSS also.. If the code is a PO500 then it might be the VSS in the pumpkin OR the Wiring to the VSS. Scan it ASAP...
 

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There are about 50 things that it could be. Reading the codes is the best way to start. Don't go to somewhere that reads them free. You get what you pay for.
 

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Echo above. If you don't get it looked at, the tranny is going to be a rebuild no later than a few months at 3K on up. Stop driving it now except to a shop. It may just be a sensor or something simple. If you have a FIPL, check your electrical connection to it. You will find this connection on the front of the motor if you have it.
 

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Disconnect both batteries for five minutes and then start it up and see what it does. With mine if I click the button to "Off" after doing this before I start to drive it it shifts properly. I click it to "off" and then put it in gear. It works perfect but no overdrive. If I don't do this it starts to flash and goes into emergency mode like yours is doing. The VSS can do this as well as the connection to the VSS but this is a good place to start with the unhooking the batteries and then clicking it to "off". You can try it not on off first if you want and then do it again with "off" if it does it again. Nobody else will tell you this.
 

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if the dome lite is out, replace the fuse, this will cause in transmission to go into the limp home mode

this may be the cheap problem sover

good luck
 

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if the dome lite is out, replace the fuse, this will cause in transmission to go into the limp home mode

this may be the cheap problem sover

good luck
That's important stuff edieedie, everybody needs to know these kind of things instead of just go to the shop and spend a bunch of hundreds or thousands of dollars getting codes and whatnot. Square one should be what you and I are saying. I wonder how many trucks went down because nobody knows these things and can't afford the huge repair bills that might not have been necessary.
 

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With mine if I click the button to "Off" after doing this before I start to drive it it shifts properly. I click it to "off" and then put it in gear. It works perfect but no overdrive. If I don't do this it starts to flash and goes into emergency mode like yours is doing.
That tells me that you most likely have a problem with the torque converter clutch. The PCM for the E4OD could only check the torque converter clutch for slippage when it was in OD. If you turn the OD off each time it will never check and won't send the trans into failure mode.

On the other had you have not fixed the slipping torque converter clutch. That will come back to bite you down the road.

There is a quick visual way to tell if it is slipping. Remove the torque converter cover plate on the bottom front of the trans and look at the front face of the torque converter. If it shows blueing on the steel it's from the heat of a slipping torque converter clutch. It doesn't have to slip enough that the driver will notice it to turn the torque converter blue and set a code.
 

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That tells me that you most likely have a problem with the torque converter clutch. The PCM for the E4OD could only check the torque converter clutch for slippage when it was in OD. If you turn the OD off each time it will never check and won't send the trans into failure mode.

On the other had you have not fixed the slipping torque converter clutch. That will come back to bite you down the road.

There is a quick visual way to tell if it is slipping. Remove the torque converter cover plate on the bottom front of the trans and look at the front face of the torque converter. If it shows blueing on the steel it's from the heat of a slipping torque converter clutch. It doesn't have to slip enough that the driver will notice it to turn the torque converter blue and set a code.
Thanks, I'll take a look at that. -- I think it's a false signal problem in the wiring or sensor's and computer myself. My situation allows me to stay in 1, 2 , 3 just as if I was pulling really heavy and needed to stay out of overdrive because of the excessive weight. I lose a little fuel economy but I get some of that back driving a little slower. If what you are saying isn't occurring I expect to get years and years of service out of this transmission. As you know, I'm a believer in staying away from overdrive in older transmissions in the first place. Even without problems, actually as a way to prevent problems and prolong the life of the transmission. I know you disagree with this but I know for a fact that a lot of E40D transmissions would go a few more hundred thousand miles by simply staying out of overdrive. That's a major "do" for a lot of these older trucks that are not worth putting thousands of dollars into transmission work. We got to junk them or walk away. I'll stay out of overdrive.
 

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1994 idi turbo, flashing overdrive

Hello
I have a 1994 f350 idi turbo that is flashing an slipping, hard shifting, I turn off , restart and it drives normal, I do notice a whirling sound but no rpm increase, right before the tranny starts acting up and light starts flashing. please give advice, I went to tranny shop, guy pulled pan didnt change fluid ,he said new fluid would cause it grip nore and cause more damage, is he right?
 

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No, he isn't right, but I doubt that new fluid is going to save it at this point.

At the least you probably need a new torque converter. The pre-'95 converters had a nasty cracking problem in the torque converter clutch apply piston. This causes leakage that will allow the converter clutch to slip. The PCM can see this, and then sets a code and sets the pressures high.

You can verify this by removing the inspection cover from the front bottom of the trans. Look at the front of the torque converter. If the cover is discolored, the clutch has been slipping. Usually they turn blue from the heat generated by the slipping going on.
 

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1994 e4od flashing od light and whirling noise

Mark
I was looking forward to your reply as most are on this topic, Same shop gave me a rebuild price of 1400.00, should I ask if this includes torque convertor?
Would a fluid change give me any more time, i dont drive it much and never pull or tow or drive in 4x 4 but do drive in stop n go.
Thanks again, mike in houston tx
 

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tranny fluid change

Mark
if I change fluid do I use gasket or silicone? My fluid dip stick is very bent and may read low fluid . is their an alternate way to read fluid level?
Thanks again mike
 

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You should always ask what any price includes.

I doubt that new fluid will buy you any time. I think it's cracked. If the pan has a rubber gasket reuse it. If it's cork, then get a rubber gasket. You can use a cork one, but they usually leak. I would not use silicone.

I don't know of any way to measure the fluid level other than a good dipstick. Get another dipstick.
 

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It appears that my transmission was doing the same thing yours is simply because I was slightly over full. My dipstick showed at the top of the white indicator and maybe a quarter inch to half inch above. Not much. I drained a little over a quart and got it to just below the zero or letter O of HOT. nothing on the O and it now works perfect I think. It was forcing it into emergency mode. That O in the word HOT is the best indicator there is. You can tell plainly if it is below it because the O holds fluid in it's center so well if it's at or above this O. Mine is now just below the O and works perfect. Transmission people listen up, this is an important distinction.
 

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I tried to removed the inspection cover on my truck in the past, I could not get a good look in there because transmission fluid started to pour out of there !!!
 

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Scan code tp/ Fipl sensor out of range

My 1994 f350 7.3 IDI was shifting hard,slipping, flashing OD light, friday 8/6/2010, took fto friend at chevy dealership, thier tranny man test drove it really hard and rough, trying to get it act up, of course it would not, drove fine after his "rough treatment", drove home 70 mph no problems, had scanned by tranny shop that was had door up after closing, this friday 8/6/2010, code read "tp/ fipl sensor out of range" does this need replacing or adjustment? How much is part?,
Thanks Mike
 

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if the dome lite is out, replace the fuse, this will cause in transmission to go into the limp home mode

this may be the cheap problem sover

good luck
You sir, are a GENIUS.

I was googling around worried that my trans was getting ready to quit and discovered your post. Sure enough, my dome light was out; I replaced the fuse (#8) and the problem went away. What a relief!!

Thank you for your wisdom and for making my Saturday night!
 

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You sir, are a GENIUS.

I was googling around worried that my trans was getting ready to quit and discovered your post. Sure enough, my dome light was out; I replaced the fuse (#8) and the problem went away. What a relief!!

Thank you for your wisdom and for making my Saturday night!
This also worked with a relatives rig that had the same issue.
Great to see that general rule of thumb with diagnosing any issue (start with the easiest and cheapest options and work your way up from that) applies here too.
 

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That's important stuff edieedie, everybody needs to know these kind of things instead of just go to the shop and spend a bunch of hundreds or thousands of dollars getting codes and whatnot. Square one should be what you and I are saying. I wonder how many trucks went down because nobody knows these things and can't afford the huge repair bills that might not have been necessary.
Im having the same issue as the guy above and the previous owner disconnected the dome light at the door switch could they be related?
 
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