I have a chance at a wrecked 94 f250 with a 351 engine and aod. Is the engine difficult to pull and can I save the computer. Also, is the transmission a c4 or c6. It has the towing package.

Thanks
Les Witt

 

The 351 can be saved with the computer. I just know it can be done but have never done it myself as I enjoy the the older model engines.

As far as the transmission, it is as you stated an AOD. That is the acronym for Automatic Overdrive, at least thats how I understand it. It came after the C4 and the C6 so it is neither of those. As far as I have been told its actually closer to the older FMX.

Anyway it all can be swapped and added to your truck if you have the time and patience. Good luck

 

Nothing really diffent in pulling that engine than an earlier model. The transmission is neither a C4 or a C6 it is an AOD. Make sure you take the computer from the Truck if you are going to use the EFI.

Good Luck,
Paul

 

The C4 was discontinued in the early 80's, but the C6 was still available in trucks into the early 90's. There is a slim possibility that the truck has a C6 in it, but it is unlikely. They were normally behind the 4.9L straight 6. Look at the end of the shifter **** for an overdrive cancel button. If it doesn't have one then it might be a C6. If it does have the overdrive cancel button and it most likely will, then the transmission is probably the E4OD. It's Ford's heavy duty 4-speed automatic and was the only overdrive automatic available with the 5.8L V-8. It's a massive heavy brute and probably would be very difficult to stuff underneath an F-1. It would be overkill anyway unless you are planning serious trailer duty or over 400 horsepower. The transmission will not be an AOD. The AOD was discontinued in the truck line after '91 and cars after '93. It was replaced by the 4R70W 4-speed automatic, but that transmission was only available behind the 4.9L and 5.0L.

The engine, wiring harness, and computer can be transplanted into your '51, but I personally don't think that a '94 F-250 would make a good donor for a first timer. The engine and computer wiring is integrated into the rest of the underhood wiring on the '92-'97 trucks. You would have to get the entire underhood wiring harness out of the donor truck, disassemble it, and separate and remove what you need and eliminate all the head light, turn signal, air bag, etc. stuff. I've done it and it's not a small task or one that should be attempted without an excellent schematic and a strong working knowledge of Ford EFI. These trucks also have an electronic speedometer. It has a microprocessor inside of it that interprets signals from the vehicle speed sensor and passes them on to the computer. You would have to account for that in your retrofit also. If you do decide to tackle this, you should also be aware that you will HAVE to keep the transmission that is with that engine as the computer also operates it. If it isn't there, the computer will know and throw one heck of a fit.

Sound scary? It sort of is. I think EFI is the greatest thing since sliced bread and retrofitting it into an older vehicle isn't rocket science, but that particular truck would make it about as difficult as it could possibly be. I'd be looking for an '87-'89 with the engine and transmission combo that you want if you really want to do an EFI swap. Those earlier trucks have a stand alone engine/computer wiring harness that only intersects the wiring for the rest of the truck in a couple of places. They don't have an electronic speedo to complicate things, either. With one of those harnesses the conversion would basically be plug and play.