Engine Swap-will A 00 Gt 4.6 Work In My 99 Gt

joe_smuckitely · Sep 5, 2014

my 99 gt started knocking and i found a cheap 2000 gt 4.6- will i be able to swap motors with out having to change alot - this is my first ever mustang and any help would be great

wmburns · Sep 5, 2014

Same Windsor motor. Direct swap.

TeamCaffeineGT · Sep 6, 2014

Whether it is a Windsor or Romeo, the swap will be straight forward. Easy peasy!

joe_smuckitely · Sep 6, 2014

one more question -would the wiring hook up or would i need the 2000 wiring setup?

TeamCaffeineGT · Sep 6, 2014

Should work just fine! The only changes I am aware of around that year are the T45 to Tremec 3650 trans and the water pump pully design change. Should be plug and play!

wmburns · Sep 7, 2014

joe_smuckitely said:
one more question -would the wiring hook up or would i need the 2000 wiring setup?

IF you needed a new wiring harness to make the swap work, it wouldn't be a "direct swap" or a "plug and play" swap.

The 1999 and 2000 GT's have the same Windsor 4.6 motors in every detail that matters.

If you were switching from a Windsor to a Romeo motor, then there would be some additional details to attend to.

1987stangman · Sep 9, 2014

Burns. Aside from the subtle romeo and windsor engines differences what other obstacles would one run into? To my knowledge it would be a direct swap if you swap in a complete engine oil pan to intake using the factory equipped transmission.

wmburns · Sep 10, 2014

1987stangman said:
Burns. Aside from the subtle romeo and windsor engines differences what other obstacles would one run into? To my knowledge it would be a direct swap if you swap in a complete engine oil pan to intake using the factory equipped transmission.

I wouldn't swap a complete 96 motor (wiring and all) into a 2000. I fairly sure that it wouldn't work without even comparing wiring diagrams. Why? Because the 96 has coil pack and the 2000 has coil on plug.

To answer your question one really needs to know the car's model year and the donor's model year. The greater the difference, the greater the risk.

The absolutely safest way is to re-use the wiring if the original motor.

OBTW, I own a 2000 GT that originally came with a Windsor motor. The motor currently between the rails came from a 2003 Grand Marquis. My Son and I did the swap in our drive way. That was 3 year ago and 50K miles. So I do have real world experience with the Windsor to Romeo swap.

TeamCaffeineGT · Sep 10, 2014

Stick with any 4.6 99 to 04 besides the Lincoln continental and you should be fine. If you decide to source the engine from a non mustang platform then you may have to change the oil pan and most definitely the intake. No biggie, it's like 20 or so bolts and a new gasket for the oil pan! The oil pickup is secured by 3 bolts. The intake is easy as well. Everything else is gonna be plug and play with your factory harness. The only difference may be in the coils or some sensors. If you run into this issue, pull them off your old motor.

As wmburns said above, avoid anything older than 99. These are non PI engines and won't plug and play with your wiring harness!

mransr · Sep 11, 2014

I swapped my 2000 Windsor for an NOS 2004 Romeo a few years ago. We had to use the 2000 wiring harness and injectors since there was a difference in the mass airflow sensor (I think that what it was, it was a few years ago and I'm 100% anymore). But other than that and the 6-bolt flywheel it was a direct swap.

1987stangman · Sep 15, 2014

wmburns said:
I wouldn't swap a complete 96 motor (wiring and all) into a 2000. I fairly sure that it wouldn't work without even comparing wiring diagrams. Why? Because the 96 has coil pack and the 2000 has coil on plug.

To answer your question one really needs to know the car's model year and the donor's model year. The greater the difference, the greater the risk.

The absolutely safest way is to re-use the wiring if the original motor.

OBTW, I own a 2000 GT that originally came with a Windsor motor. The motor currently between the rails came from a 2003 Grand Marquis. My Son and I did the swap in our drive way. That was 3 year ago and 50K miles. So I do have real world experience with the Windsor to Romeo swap.

Unless I read the OP's post wrong he is just swapping in an engine from a 2000 to a 1999. Both of those cars have the Windsor engine. So I'm not sure how the answer to his question got so far off topic.

The Grand Marquis swap you did was a different animal all of it's own. I swapped a 04' CV PI engine into my old 96' GT so I too have the same experience in this area and was in fact a little more detailed than had it been going into a New Edge Mustang given the obvious reasons.

silversmith82 · Sep 15, 2014

All the engines from 99-04 are swappable with a few details here or there. The 99 and 2000 cars used an identical setup so it will literally be as simple as pulling one motor and dropping the other one in, hooking it back up and it should fire right up like nothing even happened.

As far as ppl talking about transmissions... they where the same in 99/00 also, the upgraded T-45 with the carbon fiber synchros and the fixed reverse fork. Even if it was a 3650 it wouldn't matter except for the shifter. The transmissions from 99-04 are all direct swaps too, just need a shifter change if going from a 99-01 to a 01.5-04.

Modulars are great in that pretty much everything is swappable, you want to see how much you can swap I'll rundown my 98:

-1998 GT
-99 Windsor motor
-FRPP Romeo 8 thread PI heads
-98 timing cover
-02-04 3650 transmission
-OEM Coyote 8 bolt flywheel
-All run by the 98 computer and a speedcal, bone stock tune

Really isn't much to it at all.

Engine Swap-will A 00 Gt 4.6 Work In My 99 Gt

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