walkdawg
New member
I bought 92 with a 351. i was going to fix her up but way to much rust so I am going pull the engine and rebuild it and replace the 302 in my 89. I know I need the computer but do I need the wiring harness also??
Engine Swap
- Thread starter walkdawg
- Start date
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BLADE262US
Active member
Your goona have some fun now . LOL The 92 has different plugs than the 89 so you will need to do some splicing . Would be best if you could find a 5.8 harness out of an 89 then youd be all set I used a 91 harness in my 89 and still had to repin a couple things ended up cooking the oil pressure sending unit because it had a tach signal going through it from the piggybacked MSD didnt last too long . I got out all the prints and had to move 4 wires around to make it right . If worst comes to worst you could use your 302 harness and just dont use some of the connectors and I think you have to rearange a couple of the injectors . The 302 has a knock sensor where the 351 doesnt and my 302 had a pressure switch on the powersteering pump pressure line that tied into the computer to change ignition timing while under load . The 351 doesnt need that . There are 4 plugs in a row on drivers side fender apron thats where the repinning will take place . Theres a brown/white/black/grey round connector . See what you can come up with for a harness and get back to me . Remember even if its for a 351 if its not the same year as your cab it will probably be pinned out different . Fords electrical engineers should be strung up for that one . 
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walkdawg
New member
I have the wiring harness. I was just wondering if i would need it or could just use mine but I will use mine. I have the whole bronco to take off what I need. The 89 is in just so much better shape and I want the Bigger engine. I got it all for a really good price. I allready got the engine and and tranny out. Shuold I use my AOD tranny or the E4OD tranny? So I will take the every wire out of the 92 before i juck the rest. Will I need the fuse box also?
BLADE262US
Active member
If you use the E4OD you have to use a computer that will control it . You cant use a computer that went to a 5.8 with an AOD it has to be a 5.8 with an E4OD . I do have one of those . I had to get one that had a 5.8 with a C6 . So your putting the 89 together correct ? What year is the motor harness your going to use ? Was the harness for a 5.8 or a 5.0 ? What tranny did the 89 have ? ( im figureing the AOD ) . If you use the E4OD you will have alot of extra wireing . Its alot better tranny though when there in good shape . /emoticons/[email protected] 2x" width="20" height="20" />
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walkdawg
New member
Let me Try to clear things up. I made that confusing sorry. I have a 89 with 302 and aod. I bought a 92 with 351 and E4OD. I have the whole truck to take what I need the 92 was setting for so long that it rusted out really bad so I dont want to fix all that. My 89 is in great shape only my 302 need rebuilt and i want more power so i want to rebuild the 351 and put it into my 89. I have the computer and all the wiring harness. What else should I take off it to make life easier? Thank you for your help.
BLADE262US
Active member
You will have to have the flywheel from the 351 dont forget that its balanced different . It would really be best to find a harness from an 89 that had a 5.8 that would be easiest . I have all the ford garage wiring diagram books ( buddy works at ford ) Thats how I was able to repin mine just open the 89 book to that section of harness and then open the 91 book to same harness section and look for differences . I unfortunately have no way of posting the pages somehow seabronc post alot of wiring diagrams so maybe he can help you out here . I may be able to look at the 2 and tell you what pins have to be changed I have a book for the 89 and the 92 so I know I have the info and Im sure there different between those years . You mentioned earlier about changing the fuse box I would leave that alone its for the headlights and such . If you look at where the harness plugs in on the 92 it is a sqare plug where it goes into the firewall and an 89 is round so it wont be a simple plug in and go . I would just change the engine harness and go from there . /emoticons/[email protected] 2x" width="20" height="20" />
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walkdawg
New member
Yea I noticed that the connectors being different. Thats why i ask that question about do i need to take more off. I plan to take the whole harnness and wire it in to my 89. I am going to reuild the engine first so I will get up with you about the wiring then Ill Take every thing I can off the 92 that I might need and will need. Thank You
