• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

Anyone have wiring info for a 4cyl to V8 swap?

  • Thread starter Thread starter 1993SSP
  • Start date Start date Jan 16, 2008

1993SSP

Founding Member
Sep 5, 2001
1,194
0
37
Ky
Jan 16, 2008
#1
  • Jan 16, 2008
  • #1
Here's my story. I have access to a lift rack, air tools and a garage, but I can only get it for a few days at a time. I have a 1986 mustang 4 cylinder 5 speed and I have a 1991 5.0 complete donor car. I kinda need the exact low down on the wiring if anyone has the info for me. I've got all the other stuff figured out except for the wiring. I will be having a friend help me with this project, we plan on doing the engine and harness on one weeekend and tackling the suspension and other stuff on another weekend
 

jrichker

StangNet's favorite TOOL
In Remembrance. Thank you for your contributions
Mar 10, 2000
27,512
2,813
234
Dublin GA
Jan 17, 2008
#2
  • Jan 17, 2008
  • #2
There is a complete tech note on 4 cylinder to V8 swaps at http://forums.stangnet.com/showthread.php?t=516785, It is in The "Useful Tech Thread Index" sticky at the top of the forum.
 

SVT32VDOHC

waiting for the next hack atta
Founding Member
Nov 22, 2001
3,501
28
119
Motor City
Jan 17, 2008
#3
  • Jan 17, 2008
  • #3
To start, I would completely strip the donor car. Set the parts aside.

Next, get the 86 on hoist and completely strip that. Then take your donor parts and assemble the 86 one step at a time. That's what I did on my swap, and it worked excellent and smooth.

I would drop the entire K-frame suspension, motor and transmission as one unit. Then just bolt it up into the 86. (The only thing you will have to change is the upper strut mounts.) The 84-89 Mustang have a different top plate with the back two studs next to each other. The 90-93 has the back to studs staggered. I ran into this putting 91 struts in my 81 notch.

I would also use the entire harness from the donor car to make it easy. Are you using the donor body parts and interior parts too?
 

Black1987Stang

Active Member
Aug 22, 2004
1,422
0
37
Jersey Shore
Jan 17, 2008
#4
  • Jan 17, 2008
  • #4
SVT32VDOHC said:
To start, I would completely strip the donor car. Set the parts aside.


I would drop the entire K-frame suspension, motor and transmission as one unit. Then just bolt it up into the 86.
Click to expand...


Good idea, if you have a car lift anyway...same kinda thing they do with a gm F-body.
 

SVT32VDOHC

waiting for the next hack atta
Founding Member
Nov 22, 2001
3,501
28
119
Motor City
Jan 18, 2008
#5
  • Jan 18, 2008
  • #5
Yeah, he said he has access to a lift, so that is a plus. I would get up early and get done as fast as you can. Working without it will suck!!
 
You must log in or register to reply here.

Similar threads

F
Electrical Foxbody wiring harness 2.3 to v8 swap
  • Foxbodyjake
  • Mar 23, 2026
  • Fox 5.0 Mustang Tech
  • 2
Replies
24
Views
725
Fox 5.0 Mustang Tech Apr 13, 2026
Foxbodyjake
F
B
Electrical Fuse 8, Light Green / Black Wire
  • bleedinggreen
  • Jun 23, 2025
  • Fox 5.0 Mustang Tech
Replies
7
Views
466
Fox 5.0 Mustang Tech Jun 26, 2025
bleedinggreen
B
0
V6 to V8 Swap info
  • 02_2v_Curtis
  • Jan 11, 2026
  • 1996 - 2004 SN95 Mustang -General/Talk-
Replies
0
Views
768
1996 - 2004 SN95 Mustang -General/Talk- Jan 11, 2026
02_2v_Curtis
0
F
Electrical From scratch: alternator wiring
  • fox racer v2
  • Jun 23, 2025
  • Fox 5.0 Mustang Tech
Replies
0
Views
584
Fox 5.0 Mustang Tech Jun 23, 2025
fox racer v2
F
T
Newbie looking for some info on speedo gears
  • TDM389
  • Nov 15, 2025
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
Replies
3
Views
247
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Nov 16, 2025
TDM389
T
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?