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Old 03-09-2016, 06:59 PM   #1
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Engine swap

I think I have a rod knocking in my 1999 GT. I've found a great deal on a 2007 low mileage GT 4.6 and 5sp tranny. Computer, exhaust manifolds, exhaust system with crossover camshafts from a Stage 3 4.6L. My question is will this fit my 1999 GT without any major mods? I know the intake manifold is different as well as the air intake.
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Old 03-09-2016, 07:43 PM   #2
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Define what "stage 3 4.6L" means.....
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Old 03-09-2016, 07:50 PM   #3
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Why are all you wanting to swap in a modular again. This is coming from someone who built 3 different mustangs all making 500 -800 in about 3 years. ITS A WASTE


LSX 408 FTW
Dragging your a$$
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Old 03-09-2016, 07:51 PM   #4
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Quote:
Originally Posted by Soccerluvr4 View Post
Define what "stage 3 4.6L" means.....
Intake and tune. Duhhhhhhhh

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Old 03-09-2016, 08:31 PM   #5
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I think that he is referring to stage 3 cams.

As long as the engine is a 2 valve, it will work fine. The transmission is likely a 3650 so you will need to do some modifications to the crossmember to install it into your T45 equipped car.
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Old 03-09-2016, 08:39 PM   #6
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Quote:
Originally Posted by Rapinator126 View Post
Why are all you wanting to swap in a modular again. This is coming from someone who built 3 different mustangs all making 500 -800 in about 3 years. ITS A WASTE


LSX 408 FTW
Dragging your a$$
Because it is the most economical way to replace a worn out engine in these cars. Also, there will be some hoops to jump through when it comes to passing emissions with a LS swap.

Some people just need to drive the car to work and such... Being the fastest is a secondary priority.
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Old 03-10-2016, 05:14 AM   #7
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Quote:
Originally Posted by 69ponyxprs View Post
I think I have a rod knocking in my 1999 GT. I've found a great deal on a 2007 low mileage GT 4.6 and 5sp tranny. Computer, exhaust manifolds, exhaust system with crossover camshafts from a Stage 3 4.6L. My question is will this fit my 1999 GT without any major mods? I know the intake manifold is different as well as the air intake.
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Old 03-10-2016, 05:17 AM   #8
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No offense but I won't put a GM engine in my Ford. Besides this is my DD. My real play toy is my 69 with its stroker 427.
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Old 03-10-2016, 05:24 AM   #9
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Will my original tranny work with the newer engine it would I be better off using the newer tranny? There's nothing wrong with my original tranny.
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Old 03-10-2016, 07:01 AM   #10
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I think by "stage 3" he might mean 3V.


To install a 2005+ engine in a 2004-down car you need the Logan Motorsports swap kit. IIRC its something like $2k for the kit.


TBTH, go get yourself a 2V pullout from a 2004+ Crown Vic/Marquis/Towncar and just swap it in.
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Old 03-10-2016, 10:58 AM   #11
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Will my original tranny work with the newer engine it would I be better off using the newer tranny? There's nothing wrong with my original tranny.
In your original post you mentioned a 2007 GT 4.6 engine. Those cars came with a 3 valve engine, as opposed to the 2 valve engine in your car.
Is that correct? Is the engine out of a 2007 Mustang GT?
If so, it will be more difficult than just swapping in a replacement 2 valve engine.

As for the transmission, a T45 will physically bolt up to the newer engine with no problem. If you wanted to swap in the later TR3650 transmission though, you will need to make the appropriate changes to the transmission crossmember on your car. Scotty has actually done that swap on his previous car, so he can tell you what is neccessary to install a 3650 into a T45 equipped car.
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Old 03-10-2016, 11:46 AM   #12
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Also the 2005+ 3650s have completely different tailshaft setups as well as the remote shifter setup. He would HAVE to use his T45. Or a 01-04 3650.
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Old 03-10-2016, 06:56 PM   #13
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Thanks guys for the advice. Think I'll stick to a '04 and under engine. I need to make this as simple as possible since I'm new to these mod motors otherwise I'd rebuild it. Missed out on the cobra engine & tranny combo.
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Old 03-10-2016, 09:07 PM   #14
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If you want simple. Find a Vic motor with low miles, bust it down to the longblock. Swap your Mustang front cover and accessories onto it and it is a 100% drop in. You will want a 04-10 Vic motor.
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Old 03-25-2016, 08:46 PM   #15
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Scotty you once told me that a 1999 cobra engine would work with my computer but I would have to make some minor mods. What kind of mods and how much roughly would I be looking to spend to get it to work. I've found a good deal on a 99 cobra motor and tranny complete with complete wiring harness.
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