AOD vs EOD
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AOD vs EOD
Just as a general topic of discussion, I have a new AOD out of a 93 F150 V-8 truck that was very recently rebuilt and work great. I have fully functional EOD out of a 4.9L 94 truck. Would it be worth keeping the AOD for someday putting into the 4.9L truck? How hard is it to convert from EOD to AOD behind a 4.9L?
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The 93 just has automatic with overdrive. I've heard people say the E4OD is a better transmission also.
Lead Driver
Joined: Feb 2013
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From: Roseville, MN
The AOD is a mechanically controlled, light duty trans. The E4OD is an electronically controlled heavy duty trans, that is controlled by the same computer that controls the engine. Changing from the E4OD to the AOD would give you a significantly weaker trans and would require quite a bit of work to track down everything you need to make it work correctly, and then to make your engine work right with no codes or lights ue to the missing trans.
So the answer to your first question is no, it's not worth keeping with the idea of replacing the E4OD with it.
So the answer to your first question is no, it's not worth keeping with the idea of replacing the E4OD with it.
Fleet Mechanic
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From: Saskatchewan Canada
4R70W is what you likely have. Last AOD was used around '90, although if somebody has already played the Frankentruck game, who knows what you have on your hands? Search out one of the ID charts. 4R70W is electronically controlled like an E4OD, but uses an entirely different strategy. Different ECM or an expensive aftermarket controller would be needed. 4R70W from a Windsor V8 will bolt behind a 4.9, but Ford never built this combination, so no factory ECM is available.
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Agreed
4R70W is what you likely have. Last AOD was used around '90, although if somebody has already played the Frankentruck game, who knows what you have on your hands? Search out one of the ID charts. 4R70W is electronically controlled like an E4OD, but uses an entirely different strategy. Different ECM or an expensive aftermarket controller would be needed. 4R70W from a Windsor V8 will bolt behind a 4.9, but Ford never built this combination, so no factory ECM is available.
4R70W is what you likely have. Last AOD was used around '90, although if somebody has already played the Frankentruck game, who knows what you have on your hands? Search out one of the ID charts. 4R70W is electronically controlled like an E4OD, but uses an entirely different strategy. Different ECM or an expensive aftermarket controller would be needed. 4R70W from a Windsor V8 will bolt behind a 4.9, but Ford never built this combination, so no factory ECM is available.
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Fleet Mechanic
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From: Saskatchewan Canada
https://en.m.wikipedia.org/wiki/Ford_AOD_transmission
Yes, but same deal as the 4.9. Ford never did it. 4R70W was only used behind the 5.0 in the F150 up to 96 inclusive. So, you have to figure out how you are going to deal with the electronic shifting. 5.0 MAF conversion will work on a 5.8 and will handle the 4R70W if you use an ECM from an AT application.
One thing to keep in mind if you are using the 4R70W behind anything besides a 5.0 is flexplate balance. Something like 50 oz/in with the 5.0, 28 oz/in with the 5.8 and neutral balance with the 4.9. You can use a flexplate from an 80's Crown Vic with a 351W/AOD with the 5.8. Knock the flexplate balance weights off for the 4.9. Bellhousing will physically bolt up. Flex plate must be from an AOD/AODE/4R70W. C4/C6/E4OD flexplates will not work and if you try, you will destroy the 4R70W.
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My 94 4.9L transmission has the button to cancel OD. My 93 5.0L does not. It sounds like I probably need the transmission attached to the 5.8L engine I found.
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Well that is not going to work, the 5.8L I found is in a 4x4 Bronco. So I hope I can make my 5.0L transmission work.
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I ALSO have a 94 with a 4.9L with E4OD. Would it be easier to swap the 5.8L into the 94 with the E4OD?
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From: Ottawa, Ontario
So what is wrong with the E4OD that is currently in this truck? This trans is well known for a bunch of issues that appear to be transmission related but are actually control system related, and in these cases replacing the trans does nothing to remedy the problem.
However if the trans actually is broken then replacing it with another E4OD would be the easiest, but second easiest will be swapping in the all mechanical AOD but even then you will likely need a different driveshaft and trans cross member and of course a different PCM to avoid all the sensor errors that an absent electronic trans will create.
However if the trans actually is broken then replacing it with another E4OD would be the easiest, but second easiest will be swapping in the all mechanical AOD but even then you will likely need a different driveshaft and trans cross member and of course a different PCM to avoid all the sensor errors that an absent electronic trans will create.
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So what is wrong with the E4OD that is currently in this truck? This trans is well known for a bunch of issues that appear to be transmission related but are actually control system related, and in these cases replacing the trans does nothing to remedy the problem.
However if the trans actually is broken then replacing it with another E4OD would be the easiest, but second easiest will be swapping in the all mechanical AOD but even then you will likely need a different driveshaft and trans cross member and of course a different PCM to avoid all the sensor errors that an absent electronic trans will create.
However if the trans actually is broken then replacing it with another E4OD would be the easiest, but second easiest will be swapping in the all mechanical AOD but even then you will likely need a different driveshaft and trans cross member and of course a different PCM to avoid all the sensor errors that an absent electronic trans will create.
I'm thinking now I should just keep the 94 with the 4.9L/E4OD transmission and swap rear ends with the XLT to get the better 3.55 gear behind my 4.9L. And also swap all the chrome parts over to the 94. The 93 XLT also has some other odds and ends I need from the interior. I think I would end up with a much more useful truck in the end.
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Went with the1994 4.9L truck because the good interior and manual windows/doors and less rust. Installed a crate 4.9L and 3.55 gear and pinion. Haven't tested it yet but will in a few days once all the details are worked out.