1990 E4OD rebuild issues
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1st Gear
Joined: Jun 2025
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1990 E4OD rebuild issues
I just finished rebuilding my e4od and now it wont shift at all. I have reverse but no forward gears, however i can move the truck if i floor it and even then the motor bogs down. Any idea what i did wrong?
Hotshot
Joined: Nov 2017
Posts: 17,453
Likes: 2,767
From: Northern Ontario
Welcome to FTE.
Unfortunately, there is no way to answer your question. Do you get any codes?
Start with the basics: What fluid did you use? Where did you get your parts? What manual did you follow? Did you air test as you built? Are the feed bolts tight? Valve bodies, accumulator, Center support, all in and correct? Is the filter still in place, which filter did you use? Any modifications from stock?
Don’t floor it just to see what happens.
What was wrong with it in the first place? Ie. Why did you rebuild it, exactly?
Unfortunately, there is no way to answer your question. Do you get any codes?
Start with the basics: What fluid did you use? Where did you get your parts? What manual did you follow? Did you air test as you built? Are the feed bolts tight? Valve bodies, accumulator, Center support, all in and correct? Is the filter still in place, which filter did you use? Any modifications from stock?
Don’t floor it just to see what happens.
What was wrong with it in the first place? Ie. Why did you rebuild it, exactly?
Logistics Pro
Joined: Aug 2014
Posts: 3,554
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Did you perform the eight(8) air pressure checks to make sure all pistons are working and sealed correctly?
Hotshot
Joined: Jul 2020
Posts: 10,349
Likes: 2,588
From: Near Salt Lake City
Back to the drawing board on the rebuild
Means
Start over
You used all the special tools for the lip seals? How about the end play setup?
You might want to start right there; you have one or two cut lip seals or possibly worse, if the planetary is shot
I used to watch our trans man fight those valve bodies
Wondering what you do for a living
Overhauling a E4OD is NOT easy
I'm a Ford Chassis Master Tech and would not attempt a E4OD without about 2k worth of special tools
I would visit my trans man buddy
He visits me when he needs ball joint press equipment and wheel bearing tools
Means
Start over
You used all the special tools for the lip seals? How about the end play setup?
You might want to start right there; you have one or two cut lip seals or possibly worse, if the planetary is shot
I used to watch our trans man fight those valve bodies
Wondering what you do for a living
Overhauling a E4OD is NOT easy
I'm a Ford Chassis Master Tech and would not attempt a E4OD without about 2k worth of special tools
I would visit my trans man buddy
He visits me when he needs ball joint press equipment and wheel bearing tools
Logistics Pro
Joined: Aug 2014
Posts: 3,554
Likes: 848
Back to the drawing board on the rebuild
Means
Start over
You used all the special tools for the lip seals? How about the end play setup?
You might want to start right there; you have one or two cut lip seals or possibly worse, if the planetary is shot
I used to watch our trans man fight those valve bodies
Wondering what you do for a living
Overhauling a E4OD is NOT easy
I'm a Ford Chassis Master Tech and would not attempt a E4OD without about 2k worth of special tools
I would visit my trans man buddy
He visits me when he needs ball joint press equipment and wheel bearing tools
Means
Start over
You used all the special tools for the lip seals? How about the end play setup?
You might want to start right there; you have one or two cut lip seals or possibly worse, if the planetary is shot
I used to watch our trans man fight those valve bodies
Wondering what you do for a living
Overhauling a E4OD is NOT easy
I'm a Ford Chassis Master Tech and would not attempt a E4OD without about 2k worth of special tools
I would visit my trans man buddy
He visits me when he needs ball joint press equipment and wheel bearing tools
You dont' have to pull it yet.
Re-do the air pressure tests, that should say if any of the lip seals are bad and where on which piston.
What you do for a living? that's got nothing to do with anything.
I made the 'specialty tools', - all two of them.
It's not that difficult, just need the ATSG manual.
Cargo Master
Joined: Mar 2007
Posts: 2,791
Likes: 1,009
I'm a Master Mercedes Tech and top in the country. I remanufactured my E4OD transmission without $2k of special tools. That is what butchers do. I've learned to do thing without the need of special tools. They do make life easier, but there is more than one way to skin a cat.
I've only done one E4OD [mine] and if reverse does engage, I would think the hydraulics work [pump, filter, etc]. I would get a pressure gauge and see what is going on with that. I would plan on taking the transmission out, but I would start with the pan removal and checking the air ports. The way I do things, the ports would have been checked several times before I put in the pan so I would think it's not that. Since you got to take the valvebody out before you gut the trans, it does hurt to do it before you yank the transmission.
One way clutches is something that can be put in backwards and still look like everything is installed properly.
I've only done one E4OD [mine] and if reverse does engage, I would think the hydraulics work [pump, filter, etc]. I would get a pressure gauge and see what is going on with that. I would plan on taking the transmission out, but I would start with the pan removal and checking the air ports. The way I do things, the ports would have been checked several times before I put in the pan so I would think it's not that. Since you got to take the valvebody out before you gut the trans, it does hurt to do it before you yank the transmission.
One way clutches is something that can be put in backwards and still look like everything is installed properly.
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