I have a question about the bolt pattern used on the 6.9 and 7.3 automatics, Does any of the other ford motors share the same bellhousing bolt pattern? And how involved an ordeal is it to change from an e4od to the more durable c6? What needs to be changed to do this kind of swap? can any one HELP me with any or all of these questions.

 

The 6.9 and 7.3 IDI diesels share the same bellousing bolt pattern but the flexplates are different and are matched to the transmissions they are bolted up to (T19, ZF5, C6 and E4OD).

You need to get a vacuum regulator valve to control the C6, its basically a vacuum operated throttle position sensor and feeds that info to the tranny to adjust the shift timing and line pressure.

The C6 is also shorter, so your transmission crossmember and driveshaft will have to be modified or replaced depending on what is easier for you to pay for or make.

I would suggest to try and build up your E4OD instead, they can be made at least as strong as a C6 (the two are related after all).

 

waltmiller222,
Welcome to FTE and the IDI forum.

Diesel motors have their own bolt pattern.
A 460 is close, but will not bolt up.

Exactly what is your truck?
There are a couple members here that have gone the other way from a C 6 to an E4OD.

They should be able to tell you everything they had to change.
You will just be changing the opposite way.

 

my truck is an 89 f350 super cab, rite now its down due to tranny failure im having a hard time finding a replacement E40D in my area I have a few friend that have been dealing with the diesels for a while on a scavenger hunt but no luck as of yet. money is tight rite now due to a divorce so im trying to find a way to get my truck back on the road as low cost as i can. Im lost without it.

 

Sorry walt, I can see how that may limit your options. Its a long shot, but where are you located? I still have my C6 and related parts from swapping to an E4OD. If you are close, I may be able to help.

 

North West Florida, bout fourty miles north of the infamous spring break town Panama City. What year model E40D's will work im getting conflicting opinions here local transmission rebuilder says they are pretty much all the same just use different solenoid packs

 

I see, even shipping it to you would be way too expencive.

There is some truth to what you were told. In general you want to look for a pre-1995 tranny because thats when they made some major changes including the electronics and solenoid body, so your PCM won't be able to properly run the newer ones.

As for them being all the same, there is some truth in that too, in that the changes are mostly backwards compatible, and older trannys can partially be upgraded into a newer type tranny. But when you add up all the changes that were made by 1998, most of the internal components are different in some way.

1992 eliminated th espeedo cable too, so that limits you choices.

long story short, 1989-1991 is what you need.

What is your tranny doing right now? are you sure its dead?

 

not really sure it has done something i have never seen in quite a few years of working on trucks and cars. dont have a whole lot of diesel exsperience but thats beside the point. while normal driving it developed a vibration in overdrive a few days before it quit. when it left me stranded it just stopped pulling in all gears, no slipping jerking or anything like that. it acts as if its not even connected. my initial thought was maybe the torque converter is that possible?

 

Yes that is possible, the stock TCs can explode internally becasue they are not held together very well from factory. Although usually it usually happens just when starting off the line (under 20 MPH). IF this is in fact what happened, than everything will have to be taken apart and thoroughly cleaned and inspected. Its not something you can do in a hurry. Broken imput shaft, broken overdrive carrier, sprag....theres a long list of what could have done it I'm afraid. Whatever it is its definately a mechanical issue, these transmissions are designed with a limp mode to get you home if there is a computer or wiring failure.


You can put a C6 in there, but in reality you may come close to spending the same amount of money and you will need access to a complete donor for all the different parts you will need to make it work (you will loose fuel economy too). If you can find a wrecker that has a donor that matches your wheel base (ex cab) than it would have all the parts you would need. You can get a reman E4OD for as little as $1000, and thats the going rate for a used one where I live, but it may be cheaper in your neck of the woods.

 

Check e-bay. there is a Florida based transmission rebuilder that has E40Ds regularly posted there. I don't remember the price, but thought it was reasonable (not cheap though) if I didn't have to ship so far.

 

thanks everybody for the information you have been a great help.

 

the bolt pattern is the same on the 6.9 7.3idi and the 7.3di
the electrical connector on the solenoid pack changed in 1995 the solenoid , pump , and torque converter changed in 1999
you also need a transmission that has a speedometer drive gear on the output shaft it was basically dropped for while after 92 , but be aware that ford did continue to install output shafts in 92 models until the supply of those shafts had been exhausted and the speedometer drive gear was reintroduced again in some later vehicles
the length of either the two wheel drive or 4 wheel drive transmissions were the same you will have to count the number of teeth that are machined into the outputshaft and get a transmission with the same amount
having worked on them all i would never switch down to a c-6 from an e4od