I'll try to keep this short & simple! Vehicle is a 1988 FORD F-350, 460 ( 7.5L ) EFI, and a C6 transmission. I want to SWAP the C6 with an E4OD.

Q: Can I swap a pre-95 ECM for computing purposes to control the the electronics of the E4OD ...... or can I just use an E4OD transmission controller as a proprietory device taking care of the trans. Will this computer work?:
* F0TF-12A650-ATA * (I don't is if this ecm was intended for use with the E4OD .... anybody?

HOWEVER: Ultimately, I would like to swap the current fuel injection system to MAS system and thus ........... requiring an ECM originally designed for mas.

I know I forgot something, please refresh me with indulgence!!!

 

It is my understanding any factory PCM that was designed to work with an E4OD will require a VSS input. This signal typically comes from a sensor mounted on the rear differential. Your '88 may not have that sensor. That can be overcome with an external VSS mounting kit. In theory your project can be done if you source the PCM and wiring from a donor vehicle that already has these items.

It might be easier to go with the aftermarket trans-controller for now then when you want to go Mass Airflow Flow (MAF) for the engine go with a PCM designed for use with a manual transmission. In that way you will not lose the investment you already made in the trans-controller.

 

Thanks rla2005. My truck does have an ABS sensor mounted on the top of the sterling 10.25 differential, I plan on replacing very soon, however, I have to admit I'm a little confused on the VSS vs ABS situation. I'm thinking the the VSS monitors cruise control functions / and the ABS are for antilock brake system. I believe on the early 90's model ford trucks the VSS is mounted in the tunnel (trans to trans-case adapter), which I know I'll need to use with an air flow meter !!! Buy the way .......... I refuse to dish out 2100 bucks for complete speed density system conversion to a MAS system. At this point, I would be happy knowing this: does the factory ECM itself control engine and TRANSMISSION functions, or do they install a stand alone controller for the E4OD at the factory ......... in addition to the engine ECM ......... Sorry, but I don't even know if I'm asking this question properly. thanks again

 

The factory EEC's are full powertrain control modules.. engine and trans.
I'm not sure exactly how the earlier trucks with mechanical speedos get a speed input signal to the computer.. whether it comes from the RABS/VSS sensor or if it's somehow pulled from the speedo itself... that's what is done on the later trucks with electronic speedos. But in any case all EEC types require a speed input so it will already be present at the EEC connector in your truck right now and you won't have to change anything to make it work with a different EEC. This page here compares the EEC connector pinouts for the common truck computers.. http://www.fordfuelinjection.com/truckpinouts.html

 

I hope Paul's response clears up some of your questions, it does help me alot! I agree that shelling out some of the $$$ for an aftermarket fuel injection system seems pretty steep for a more or less stock application. If you have the VSS sensor in the rear diff. already that is a good start.

I recall reading somewhere recently the pulses from the transmission/transfer case mounted speed sensor were rated at ~8000 pulses per mile at some known gear ratio/tire size. The VSS sensor in the rear differential is rated at ~72,000 pulses for the same tire size. A module called a PSOM is used to convert the differential mounted VSS to a usable signal for use with the PCM, speedo, odometer. The PSOM uses a programmed conversion constant to drive the speedo, odometer and VSS signal to the EEC. It is the conversion constant that is manipulated for the different tire sizes. A differential mounted VSS is not affected by the gear ratio. The tone ring will always have 108 teeth regardless of what ring and pinion are installed. That must be the reason why the differential mounted VSS signal goes to the RABS module before being routed to the PSOM. The RABS is still looking at that ~72,000 pulses per mile signal.

So maybe the best answer might be you could find a factory MAF PCM that also has the capability to support the E4OD but you will also need the PSOM to properly drive the speedo and VSS signal to the PCM.

For reference: What's a PSOM & how do I "P" it???

 

Thanks Paul and RLA, from what I've already learned and what yooooozzzz guyzzzzz are writting I'm a little closer in understanding what needs to be done to get the E4OD transmission installed and operating properly. BUT if I were to say I GOT IT ...... would be a lie .................. so based on this replacement ECM part # *F0TF-12A650-ATA ~ for 1990 1991 Ford Trucks & Vans with the 7.5L .......... will this computer do what I need it to do to take care of both engine & tranz functions? Everything I know about this ECM is what it states above, what I don't know is if it was installed in a truck / van that had an E4OD ....... anybody know if this will work with the overdrive ???????????? - Thanks again, Paul and RLA