LS Swap help needed?

BRENNANREEVE99

MEMBER
1998 FORD MUSTANG
3.8L
V6
2WD
MANUAL
160,000 MILES

I just watched a video on YouTube for a really good LS swap wiring tutorial. My question is on the electrical harness. Would I still be able to follow the LS to ECM procedure on the video or would it be different in my case? If different, what electrical parts would I need to complete the job? This is my first engine swap I am taking on and terrified to get into the wiring aspect.

2 Replies

STEVE W.

MECHANIC
13,414 POSTS

If you are swapping an LS for the Mustang your best bet would be to get a stand-alone controller instead of trying to use the factory parts but be aware if you are in any state that does emissions testing it would likely fail. You are also looking at a different K member up front and altering the spring mounting to get the LS to tuck in that engine bay.

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Tuesday, September 10th, 2024 AT 12:25 PM

RYAN L

ADMIN
256 POSTS

Hey there!

So, I would definitely have a stand-alone system like I did with the Bel Air. None of the stock Ford gauges will work, except for maybe the speedometer and fuel gauge. All of that will have to be modified or replaced.

Essentially, I would run two ECMs on the same car. One to power and control all of the Ford stuff, fuel gauge and lights. Then the second one that just handles the LS engine.

Hope that helps!

Best,
Ryan

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Wednesday, September 11th, 2024 AT 10:47 AM