99 4.6 into a 98 4.6

Oktohatericers · Aug 21, 2005

I am droping a 99 Gt motor into my 98 Gt. I have some questions about it, so if anyone has done this before ill take all the help i can get. Ok, here are a few questions i have come up with for now.....

1. Will all the 98 mounts work with the 99?
2. Will all the wiring be the same?
3. Will the ECU's match up or will i need a new one?
4. Will my exhaust be the same or will i need a new one?
5. Will my transmission work or will i need to replace it?

If you have done this before and had complications with something please let me know, ill take all the advice i can get. Thanks

mrvax · Aug 21, 2005

From what I've heard, it's an easy swap. You use the 98GT's spark plug wires, coil packs and ECU. Drop it just like a direct replacement. Good luck and post up how it went when you're finished.

MGSTANG · Aug 21, 2005

The 98 GT's dont' use COP, do they?

MGSTANG · Aug 21, 2005

99's are cop, no spark plug wires

CanadaStang · Aug 21, 2005

Oktohatericers said:
I am droping a 99 Gt motor into my 98 Gt. I have some questions about it, so if anyone has done this before ill take all the help i can get. Ok, here are a few questions i have come up with for now.....

1. Will all the 98 mounts work with the 99?
2. Will all the wiring be the same?
3. Will the ECU's match up or will i need a new one?
4. Will my exhaust be the same or will i need a new one?
5. Will my transmission work or will i need to replace it?

If you have done this before and had complications with something please let me know, ill take all the advice i can get. Thanks

1) Yip
2) You'll need to use your alt., and sensors and stuff as well as your fuel rails and Maf too [I think].
3) Your EEC will be fine
4) Your exhaust will work
5) Your tranny will bolt right up
You'll also need to tap the aluminum crossover on the intake [if the 99' intake has one] for the 2nd temp sensor or else use the fabled T-fitting or put it in the side of the engine block [should be a plug you can remove ]

tomustang · Aug 21, 2005

CanadaStang said:
You'll also need to tap the aluminum crossover on the intake [if the 99' intake has one] for the 2nd temp sensor or else use the fabled T-fitting or put it in the side of the engine block [should be a plug you can remove ]

Shiroelex · Aug 21, 2005

Unless that 99 engine has much less mileage on it than the 98 or something, I'd just do the PI swap over, to have that bump in compression. Unless you have plans on forced induction?

Oktohatericers · Aug 21, 2005

Thanks for everything guys. These were just a few questions i had. Im swapping motors b/c my 98 has a horrific rod knock. Plus, my 98 has 90,000 miles on it while the 99 has 3,000. I was told it was simple but wanted to make sure on a few things. Thanks again and ill keep posting on the progress.

Gearbanger 101 · Aug 21, 2005

tomustang said:

I knew captain "T-fitting" would show up to give his blessing eventually.

billfisher · Aug 21, 2005

Gearbanger 101 said:
I knew captain "T-fitting" would show up to give his blessing eventually.

that kills me. (i tried it and it didn't work)

tomustang · Aug 21, 2005

That would...

(i tried it and it didn't work) - try what?

green_fow_six · Aug 21, 2005

Oktohatericers said:
Thanks for everything guys. These were just a few questions i had. Im swapping motors b/c my 98 has a horrific rod knock. Plus, my 98 has 90,000 miles on it while the 99 has 3,000. I was told it was simple but wanted to make sure on a few things. Thanks again and ill keep posting on the progress.

I also reused my alternator and bracket, since the plug is different. I think there is a way to modify the wiring to use the newer style alternator but I didn't bother.

forpit2000gt · Aug 22, 2005

you have everthing to switch over. reply when it is completed..

99 4.6 into a 98 4.6

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