Computer compatibility, 91 F150

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Mar 26, 2017 | 10:08 PM

Bootlegger's Deluxe

Thread Starter

Fleet Mechanic

Joined: Oct 2010

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From: Delhi, Iowa

Computer compatibility, 91 F150

hello everyone!

I'm working on my 1991 F150, it came from the factory with a 302/ automatic. I started tearing it apart with plans to rebuild the 302 and swap in a ZF 5 speed, and so i nabbed a donor computer out of a 91 F150, 302/M5od truck.

Now, as the build is progressing into more of a "restomod" type of build, with the body coming off, etc, i am pondering if i should switch to a 351W/ 5 speed combo. I have a 351W already, and i can certainly source the proper parts to mate it to the truck, my question lies with the computer work.

what years do i need to find a computer from to make the truck function? I do have a 95 F250 parts truck that was a 351w/ 5 speed, i dont know if it is compatible, or not really? Also, will the engine wiring harness work with the 351W i have? the Windsor i am planning on using came out of a 95 F150, it was an automatic truck, and yes, it is still speed density, not mass air. i did keep the entire harness from that truck as well, but i dont know if it will do me any good.

someone with more experience care to chime in?

Mar 26, 2017 | 11:39 PM

ChRoNo16

Senior User

Joined: Dec 2010

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From: Shafer, MN

I dont think your harness will work. Yes its all OBD1 so most likely you can use the comp from the truck with the 351 in it.

Mar 27, 2017 | 06:45 AM

'89F2urd

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Yes the 95 comp will work, assuming it's speed density.

Mar 27, 2017 | 07:27 AM

Bootlegger's Deluxe

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Fleet Mechanic

Joined: Oct 2010

Posts: 1,690

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From: Delhi, Iowa

what underhood harness will i need then? the one from the stock 302 that was in my 91, or the harness that came from a 95?

Mar 27, 2017 | 07:42 AM

'89F2urd

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Also assuming your f1fiddy is speed density, you change no wiring. Just swap the computer.

Mar 27, 2017 | 08:30 AM

Conanski

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Joined: Jun 2006

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From: Ottawa, Ontario

Quote:

Originally Posted by '89F2urd

you change no wiring. Just swap the computer.

+1, keep the original harness intact and adapt the motor to it where necessary. The only place this will be necessary is with the distributor, you will have to modify the 5.8 distributor to accept a TFI module and change the PIP module.