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Old 11-03-2011, 08:52 PM   #1
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5.0 HO swap

Just bought a complete running 88 GT for the 5.0HO engine, AOD tranny and 8.8 rearend to put into my 66 coupe project (factory 289). The rest of the GT is pretty shot (only thing worth saving would be glass, outer turn signal lenses, right rear brake light lens, trunk lid and hood, sawzall gonna get me to what I want) but I know everything works, rebuilding everything before the swap. I had originally planned for a carb but think fuel injected would look cooler in there with the stock intake. I've never messed with fuel injection before though. I know I'm gonna need to get engine harness and computer for it to run. Read something about the fuel pump also. Anybody familiar with that swap have any input or parts I should remove before it goes to scrap?
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Old 11-03-2011, 09:19 PM   #2
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Re: 5.0 HO swap

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Originally Posted by gc19662007 View Post
Just bought a complete running 88 GT for the 5.0HO engine, AOD tranny and 8.8 rearend to put into my 66 coupe project (factory 289). The rest of the GT is pretty shot (only thing worth saving would be glass, outer turn signal lenses, right rear brake light lens, trunk lid and hood, sawzall gonna get me to what I want) but I know everything works, rebuilding everything before the swap. I had originally planned for a carb but think fuel injected would look cooler in there with the stock intake. I've never messed with fuel injection before though. I know I'm gonna need to get engine harness and computer for it to run. Read something about the fuel pump also. Anybody familiar with that swap have any input or parts I should remove before it goes to scrap?
In 1988 the car could be speed density or MAF (California cars only).
Do you know which one you have?
If it is speed density and you plan on modifying the engine much you will want to convert it to MAF.

Pull the entire wiring harness and computer, JIC you need it.

You will need an EFI fuel pump, but in your case it will be easier to use an exterior mounted pump.

Save anything you think you might use or be able to sell. It's easy to throw it out, but much harder to find and replace if you happen to need it later.
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Old 11-04-2011, 04:42 AM   #3
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If you were in Florida you could use my 66 convertible as reference. It is a great swap to do and if you leave the stock 255 rear end from the 289 you can get close to 30 MPG.

---------- Post added at 06:42 AM ---------- Previous post was at 06:23 AM ----------

Like Trojan Horse said get as much off of the gt as possible. If I were you I would hold onto the car until the swap was finished. You can modify the fuel tank to put the gt fuel pump into the 66 tank so you won't have to hear the external pump running. The gt engine harness will work on the 66 and you can locate the computer above the glove box. Also be sure to use a relay on the ignition of the 66 because there is a resistor on that line and there isn't enough voltage to get the computer to work.
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Old 11-04-2011, 05:43 AM   #4
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Quote:
Originally Posted by Trojan Horse

In 1988 the car could be speed density or MAF (California cars only).
Do you know which one you have?
If it is speed density and you plan on modifying the engine much you will want to convert it to MAF.

Pull the entire wiring harness and computer, JIC you need it.

You will need an EFI fuel pump, but in your case it will be easier to use an exterior mounted pump.

Save anything you think you might use or be able to sell. It's easy to throw it out, but much harder to find and replace if you happen to need it later.
I am trailoring it here tomorrow. I'm not sure which it is but I don't plan on much modification to the engine. I'm going for a daily driver with the 66 and pushing for as much gas mileage as I can squeeze out of it. I plan on an exhaust system, as well as lizard skin sound proofing and heat shield everywhere I can get it in the interior so fuel pump noise shouldn't be an issue an keep it easy to change if needed without pulling the tank. The 66 is a bare shell on dollies at the moment so I can plan it out and mock everything up, perfect time.
On the 88, I will go ahead and strip the entire engine compartment and under the dash. But nothing body wise is good to sell. I've only got a 2 car garage and one side has the 66 in it, I have to get it in, tear it down to parts and haul it out before it starts driving me nuts. I sold the engine and tranny from the 66 so I have actually paid for next to nothing for the 5.0.
I appreciate the input and i'll probably have some questions, hopefully in a couple of years it'll be on the road.

---------- Post added at 06:43 AM ---------- Previous post was at 06:34 AM ----------

I hadn't thought of using the original rear end. I looked up the code and it's a 7 3/4" 280:1. And won't need any mods other than brake conversion, cleaning and painting.
Like i said, its being built for a daily driver, i drive 54 miles of freeway m-f. Good call, thanks.
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Old 11-04-2011, 06:13 AM   #5
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If you would like to see some pics of mine you can look at them at mustangs and iron horses on Facebook
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Old 11-04-2011, 07:30 AM   #6
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Love to see those. I can't find it in there, you have a link?

---------- Post added at 08:23 AM ---------- Previous post was at 08:22 AM ----------

Nevermind, googled it.

---------- Post added at 08:30 AM ---------- Previous post was at 08:23 AM ----------

Sweet Mustang. That is what I'm wanting to do under the hood.
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Old 11-04-2011, 07:33 AM   #7
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Try http://www.facebook.com/pages/mustan...32065076816575
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Old 11-04-2011, 08:43 AM   #8
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Re: 5.0 HO swap

I put a 5.0 from an 89 into a 65. There are a LOT of electrical connections you will have to make if you are keeping the fuel injected setup. Over 100. Just mark them VERY well when you pull the harness from the 88. Get ALL the sensor and things it is attached to. A couple of specific things to make sure you get: The interia switch in the trunk. This cuts off the fuel pump incase of a collision. Get the gas pedal and cable. These are different on the "newer" cars and helps if you just grab it. I had to fashion a bracket to mount it to the floorboard. Not a big deal.

Mine had a mild cam in it, put an AOD from a 72 TBird behind it and an 8 inch rearend in the back. My son took it to the local drag strip and ran 10.8 on street tires. He was banned from the track because it was a 10 second car without a roll cage, chute, etc.

Good luck. The conversion makes an AWESOME daily driver. That's what we used ours for.
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Old 11-25-2011, 08:33 PM   #9
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I have finally gotten around to pulling the entire harness out of the whole car, what a pain in the butt with the dash in place. I did invest in a Chilton book for reference but ended up wrapping chain through the dash in certain areas and used my engine hoist and a sawsall to rip it apart to gain easy access, whiskey hasnt always spawned the best of ideas for me but it worked well and i was careful not to rip anything out i wanted to keep. Is there an easy answer to what exactly I need to keep as in only the wiring from the injectors to the computer? I am keeping the whole thing otherwise just in case along with all sensors and will sort through all that when the time comes. The engine and tranny will be stored until the body goes to paint.

---------- Post added at 09:32 PM ---------- Previous post was at 09:30 PM ----------

And it's a 91 GT not an 88. Those look the same to me and the guy I bought it from told me it was a 351 on top of that anyway so... I have a 91 5 liter. If that makes any difference.

---------- Post added at 09:33 PM ---------- Previous post was at 09:32 PM ----------

89*
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Old 11-25-2011, 08:42 PM   #10
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Quote:
Originally Posted by gc19662007
I have finally gotten around to pulling the entire harness out of the whole car, what a pain in the butt with the dash in place. I did invest in a Chilton book for reference but ended up wrapping chain through the dash in certain areas and used my engine hoist and a sawsall to rip it apart to gain easy access, whiskey hasnt always spawned the best of ideas for me but it worked well and i was careful not to rip anything out i wanted to keep. Is there an easy answer to what exactly I need to keep as in only the wiring from the injectors to the computer? I am keeping the whole thing otherwise just in case along with all sensors and will sort through all that when the time comes. The engine and tranny will be stored until the body goes to paint.

---------- Post added at 09:32 PM ---------- Previous post was at 09:30 PM ----------

And it's a 91 GT not an 88. Those look the same to me and the guy I bought it from told me it was a 351 on top of that anyway so... I have a 91 5 liter. If that makes any difference.

---------- Post added at 09:33 PM ---------- Previous post was at 09:32 PM ----------

89*
The motor is a 351? If so it is not the stock motor.u may want to pull the numbers off the block to see what u really have.
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Old 11-25-2011, 09:10 PM   #11
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No it's a 302. The guy didn't know what year mustang he had, much less the engine. A 351 wouldn't hurt my feelings any but it isn't a 351.

---------- Post added at 10:10 PM ---------- Previous post was at 10:05 PM ----------

I'm using it for a 66 coupe build, and not gonna be stock anyways. Designing a custom dash with AC vents, going with the fiberglass GT350 deck lid and filler panels, fiberglass ramjet hood, fiberflass fenders, possibly the type R front end, not sure I like that yet, GT rear pan with the exhaust cutouts, TCI r&p swap, 5.0 HO EFI & aod tranny swap along with whatever else I can think of.
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Old 11-25-2011, 09:13 PM   #12
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Quote:
Originally Posted by gc19662007
No it's a 302. The guy didn't know what year mustang he had, much less the engine. A 351 wouldn't hurt my feelings any but it isn't a 351.

---------- Post added at 10:10 PM ---------- Previous post was at 10:05 PM ----------

I'm using it for a 66 coupe build, and not gonna be stock anyways. Designing a custom dash with AC vents, going with the fiberglass GT350 deck lid and filler panels, fiberglass ramjet hood, fiberflass fenders, possibly the type R front end, not sure I like that yet, GT rear pan with the exhaust cutouts, TCI r&p swap, 5.0 HO EFI & aod tranny swap along with whatever else I can think of.
Sounds pretty bad a**.keep us updated.I can't wait to see it!
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Old 11-25-2011, 09:17 PM   #13
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I'm hoping so. I will keep posting new pics in my garage. Still a ways off the finished project but to the point I need to make a few major decisions about the build.
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Old 11-25-2011, 09:21 PM   #14
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I'm hoping so. I will keep posting new pics in my garage. Still a ways off the finished project but to the point I need to make a few major decisions about the build.
We would be more than happy to give our opinions if they are wanted.just remember take your time and try to do the best u can.when u get in a hurry and take short cuts sometimes they bite u in the butt.
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Old 11-25-2011, 09:28 PM   #15
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Oh that's why I'm posting. Never attempted anything like this before. I did a frame off 71 chevy longbed about 15 years ago but that was all stock, this is all new territory for me and have been reaching out on the questions I've had, such as EFI engine in an older car, never messed with it before. I'd never turn down any advice given, guys on here have been great with that.
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Old 11-25-2011, 09:33 PM   #16
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Originally Posted by gc19662007
Oh that's why I'm posting. Never attempted anything like this before. I did a frame off 71 chevy longbed about 15 years ago but that was all stock, this is all new territory for me and have been reaching out on the questions I've had, such as EFI engine in an older car, never messed with it before. I'd never turn down any advice given, guys on here have been great with that.
+1
This is definitely the place to be when doing a project like that.they have been great help for me to.
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Old 11-25-2011, 09:33 PM   #17
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And I've got 6 years before my daughter gets my 07. Plenty of time.....I hope.
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