Can anybody help me? I am about to transplant a 4.9L efi engine into my 1974 f250 bighboy. I need to know what I need to do to the engine elect. harsess to make it run in my truck.
I will have the intire donor truck so hopefully that will be enough.
Mounting the engine fuel system cooling system is not an issue for me. what I need help with is the wiring diagram side of the project. Just need to know all of what i will need from the harness to make it a stand alone system. Also need info on VSS, it will be mated to a zf-5 speed, will the VSS just need to be hooked up the tranny at the speedo cable?

Thanks in advance.
Nick.

 

I hope someone has some insight, because im kind of in the same boat.
I didnt pull the engine though, and the donor truck is crushed. And mine is an auto set up and i want to go to manual.

 

i'm not an expert, but...just thinking particularly about the ignition system:

it'll depend on what year the EFI engine is.
for example- if its got a grey-module TFI ignition, you'll be getting your ignition dwell from the distributor.

if its a black-module (CCD) TFI ignition...it gets its igniton dwell from (gasp)...the computer.

i'm sure that's not the only consideration, its just the first one that came to mind.

 

Thanks all

 

Turns out the truck that was givin to me was an 85 so now it make it simpiler for me to transplant. Thanks again for the replies.

 

85 4.9 is not EFI
It's a feed back system. You will be better off sticking the carb and ignition off your truck in it.

Feed backs carbs were only around for 2 years, and were not the best to work on