Question on 1999 gt engine swap for an 2003 gt - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 02-25-2014 Thread Starter
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Question on 1999 gt engine swap for an 2003 gt

Didn't a find a thread that was near what I'm going to ask but here goes. I'm going to do an engine swap on my 1999 gt 4.6 for a 2003 gt engine but my old engine has a super chip computer and has a 4 bank switch that connects to the computer. Now the question is if this 2003 engine will not have any problems starting up or will it even start. I have the mechanic doing the swap now but was wondering if it will have a problem. Thanks in advance for your help.

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post #2 of 6 (permalink) Old 02-25-2014
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From the PCM's point of view there isn't a difference between the 1999-2000 Windsor and the 2001+ Romeo providing the original induction, ignition, exhaust and wiring have been used. The motors as an assembly are the same.

Note I said the original...... So if you start mix/matching parts, then the above statement may no longer be true. For example, with the 1999 PCM if you use the larger fuel injectors of the later MY, then obviously there would be some effect of the larger fuel injectors.

OBTW, the motor currently in my 2000 GT came out of a 2003 Grand Marquis. So I have actually done the Windsor to Romeo swap. That was 3 years and 45K miles ago.


2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #3 of 6 (permalink) Old 02-25-2014 Thread Starter
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The things that im putting on the 2003 motor is the manifold, fuel injectors, throttle body, and headers because they sold me the motor like that.
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post #4 of 6 (permalink) Old 03-05-2014 Thread Starter
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The mechanic that is doing the swap is telling me I need a different flywheel for my t45 transmission cuz the 2003 motor that im putting in is a 6 bolt and the one on the 1999 engine is a 8 bolt would it make a difference
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post #5 of 6 (permalink) Old 03-05-2014
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Well known problem. Windsor has 8 bolt crank and Romeo has 6 bolt.

Options.
Buy a new flywheel.

Go to a salvage yard and get a replacement flywheel. Try car-part.com for a searchable list salvage yards in your area.

Search the swap adds. Some of us have left over parts from old projects.

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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post #6 of 6 (permalink) Old 03-05-2014
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Should be fine using the Romeo's 6 bolt, 11" flywheel with your T45 which with your former Windsor engine used an 8 bolt, 10.5" flywheel.

Your T45 clutch measures approx. 10.5" in diameter which should be just fine with a flywheel that measures slightly larger. If it were the other way around and you were swappimg a Romeo for a Windsor (and had a TR3650 trans as most Romeo's do), then you would need to use a 10.5" clutch for a T45 (which will work in the 3650).


2001 GT Convertible
/1967 Coupe
All the usual bolt-on's /200 I6, C4

And a few Explorers too... 2008 4.0 XLT 4x2, 1996 XLT 5.0 4x2, 2003 Sport Trac XLT 4.0 4x4
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