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Classic Mustangs Tech Forum

Technical discussions specific to 1964-1967, 1968-1970, and 1971-1973 Classic Mustang. Discuss all tech related to in-line six cylinder and V8 powered Vintage Mustangs here.

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Unread 08-27-2007   #1 (permalink)
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Default Installing 5.0 into 1966 Mustang Coupe

Allright guys and gals. This is your chance to combine all the years of experience to make a really useful thread, to join the many other great threads on this site!

I'm getting ready to replace my inline 6 with a 5.0 HO EFI that came out of a '94 Stang. I promise to share all of my experience (step by step) right here in this thread if you guys will help me along. :hihi: So....what do I do first?

Some of my many questions are:
1. How should I prep the car?
2. Do I need to replace the suspension? (please say no, or at least not right away)
3. Will the stock radiator be sufficient?
4. What's a good automatic transmission to put behind it?
5. What rear end do I need to put in?
6. Where can I get EFI brains for an automatic (it came with manual brains)?

Please check out my signature to see what I've already done to the car just to get it driveable. Bad planning on my part, I know, but I'll get the 4-lugs changed to 5-lugs eventually. My buddy told me that was an "eventually" task, that I shouldn't have any problems as long as I don't go to the drag strip with it.

7. Where do I sell the stuff I don't need anymore?

Thanks!!
Bryan
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Unread 08-27-2007   #2 (permalink)
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1. Take out the old engine, for starters.
2. Pretty sure you do. Everything I have read over the years says the stock 6cyl suspension can't handle the added V8 weight. Might be able to get by with just springs since you've already restored the suspension. Ever thought about a built up I6? Triple Offenheuser carbs and a bigger cam?
3. The stock radiator is barely enough for the original engine. What kinda shape is it in? I think you'd be best off with a 3 or 4 core radiator.
4. Great time to get an overdrive transmission, stick or auto.
5. A bigger one. 8", 9", or 8.8", but not the stock 7.5" you've most likely got in there now.
6. eBay?
7. eBay!

Others will certainly be along soon to give you lots more tips and wisdom.

Good Luck!
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Unread 08-27-2007   #3 (permalink)
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Thanks Mike.

I'm definitely going with an AOD. I think for now I'll just use the "stock" AOD that came with the engine (which negates my original questions 4 and 6). But, if you have suggestions on a better AOD, let me know!

What about the suspension? Can I get away with stock suspension for a bit while I get the engine put it? Or do I need to do the suspension before I put the engine in? I only ask because my 6 cyl is starting to act funny. Are there any suspensions (front and back) that I can get from the junk yard that will bolt right in?

What do you mean by a 3 or 4 core radiator?

I was going to build up the I6, but I was able to get a great deal on the 5.0 for about half the money that the parts would cost to build up the I6. It was a very hard decision to make, especially since I had already done the suspension.

Thanks!
Bryan
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Unread 08-28-2007   #4 (permalink)
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Did you measure between the shock towers to see if the motor would fit?

I swapped my I6 with a '91EFI with JB shorty headers (application specific) and they just barely touched the shock towers. I had to...ahemm...adjust for some clearance - read "hammer".

I decided to upgrade all steering, tierods, upper and lower arms, and driveshaft while I was at it. I also found a 9" rearend assembly with the spring perches already in the right spot at a swap meet.

Have fun.

-Mike
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Unread 08-28-2007   #5 (permalink)
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I'm planning on doing the same thing, but this is what I understand from my research so far.

The 94. 5.0 is the same as in the foxbodies. The only differences is that the tranny (if its a 5 speed) is longer and won't line up with hole in the floor. (reason y fox body T5s are used). You'll need the wiring harness from the donor car, along with the cpu. Of course you'll have to match the motor/cpu to the automatic tranny.

Suspension/spindles will have to be upgraded v8. Not sure which rear end (obviously 9" is the best..but $). If you search amazon.com, there even books about restomoding mustangs that can help you.

For me, I'm going to strip the donor car all of the parts so that I know I have them all. I did this once before and converted my 95 2.2l cavalier into a 2001 2.4l (s/c'd later on) with no problems and even raced it for 2 years running consistant times of 13.9 in the 1/4mile in street trim.

Hope that helps!
Nate
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Unread 08-28-2007   #6 (permalink)
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The '66' Mustang came with the 289, same size as the 302. Most headers should fit, not sure with the AOD thou. They also came with the 8" rear end that would bolt in and take the power of a stock 5.0 w/auto. As far as wiring up the swap, I have several swap wiring diagrams, just what you will need to go from the old to the new.
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Unread 08-28-2007   #7 (permalink)
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Great info.

Please explain more about the "lineup" of the AOD. Are there any kits that I could use to connect the stock shifter to the AOD shift lever? If not, could I just cut a new hole for the shifter and go without the console?

Also, what cars would have the 8 or 9 inch rear end that I'm looking for (so I can scout the junk yards this weekend)? Would they bolt in without too much trouble?

Thanks,
Bryan
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Unread 08-28-2007   #8 (permalink)
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Here's a little help on the topic....read the pages to the left.

www.midnightdsigns.com/james
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Unread 08-29-2007   #9 (permalink)
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HOLY COW is that a good source. TONS of detailed info, great pics, and a dang good job. Can I assume that's yours? Either way, a great looking install and a great looking car. I can only hope mine comes out half that nice.

Thank you!
Bryan
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Unread 08-29-2007   #10 (permalink)
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Bryan,

I think most the major parts vendors have some form of kit or adapter parts for an AOD conversion, namely the TV cable, mount, and so on.

Michael
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Unread 08-29-2007   #11 (permalink)
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Mike,
That's good news. If I understand you correctly, that means no new hole in the floor pan and I can still use the stock opening, just connecting the two via some aftermarket linkage?

JamesW (or anyone else that knows),
Where can I get a new axle housing (8 or 9 inch, preferably with axles) that will fit the car with no major mods? Keep in mind, my stock 6 cyl has a 7.5 inch and that ain't gonna cut it with a 5.0. I want to take advantage of a day off this week (I'm military, so labor day weekend is a great time to do this). What kind of car am I looking for to find a donor rear end?

Thanks!
Bryan
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Unread 08-29-2007   #12 (permalink)
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I know that a mustang 66 can have a 351C4v inserted and that is a BIG engine so the 5.0 will fit OK( They had problem when changing plugs)

The easiest way (if U ask me) is to get a 351 w complet with gearbox and rear stuff and just bolt it on.

Try to get a big radiator as well, those big v8 generates lots of heat.

I don“t think that suspension will hold the engine. You could try by using alu heads and intake and headers.

Good luck with the job
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Unread 08-29-2007   #13 (permalink)
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Okay...good stuff.

I found an old post from Dave that said the rear end on a "57-59 Ranchero and station wagon is 57.25 iches (narrowest 9" housing)" which is the same as a '66 Mustang. What do I do to change the leaf spring attachment points?

And are Rancheros and Station Wagons still easy to find?
Thanks!
Bryan
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Unread 08-30-2007   #14 (permalink)
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Bryan,

Here are a few links to get you going:
Shifter for AOD:
http://www.mustangsunlimited.com/ite...atkey=emustang

Currie crate rearend:
Currie Enterprises Crate Rear End Products

Good site with AOD conversion parts:
Early Mustang AOD Conversion Kit, 1965, 1966, 1967, 1968, 1969, 1970, 1971, 1972, 1973

I'm sure you won't need all those parts, like the flex plate for example, if you already have it with the AOD/5.0 you have. But they have things like the crossmember, mount, a kit to convert your original shifter, etc.

Article about a 5.0/AOD swap:
5.0L Engine & AOD Transmission Swap - Mustang & Fords Magazine

There's a lot out there for this type of conversion. Hope this helps out, and keep us posted!
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Unread 08-30-2007   #15 (permalink)
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If I were to find a rear end that's not EXACTLY the same dimensions as the Mustang, let's say 3/4 inch wider on either side (1.5" total), I would be able to take care of this with offset and/or backspacing on the wheels, right?

Thanks!
Bryan
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