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01-25-2014
found a 2004 gtp with 100,000 miles on engine and tranny .i am taking the seats that seems easy enough but what am i getting myself into trying to swap the engine and tranny into my 99 gt. i am not a mechanic but my brother in law is so you can be specific as possible. any advice what to look for links to the subject would be appreciated as swap and gtp as keywords into the search engine seem to be to broad of terms....thanks
01-25-2014
The swap will not be easy in the least.
We are talking completely different wire harness, different and wrong transmission that could work with an older car/pcm. You'd need a GTP pcm from 99-02 (an 03 might work), wire harness from a 99-03 GTP, tb plate adapter because 04+ is drive by wire and 97-03 is cable TB. I'm sure many other odds and ends and a custom computer tune to make it run.
01-25-2014
so i could go to the junkyard get a wire harness and pcm from a 99 -03 gtp....where would i be able to find a throttle body adapter,and would a canned tune from someone like intense,overkill,etc be sufficient.
01-25-2014
Why would he need the harness?
01-26-2014
A junkyard can get you a PCM.Originally Posted by lance4682
Vendors sell TB plates.
The transmission will not work without removing some parts and replacing them with older parts. The 04+ is controlled different and has parts that only going to on the 04+ computer. It's almost easier to just get a 99-02 transmission (03 is different again and requires more changing of various items).
I think big picture, for direct swaps with no addings of sensors/wires. Is it 100% needed, no but if can make it plug and plug sorta.
01-26-2014
Was gonna say cause im using a 98 z34 harness for my l67 swap
01-26-2014
One thing he needs for sure is an l67 fuel rail. L32s are returnless
01-26-2014
use the 99 gt trans and swap the motor over. You'll need a tb adapter, tb, fuel rail, and to extend some of your harness.
01-26-2014
you can controll an 03+ trans with the earlier 97/98-02 pcm's with just moving a few pins and retaining your external range switch.
youll have to fart with the trans cooler lines if your radiator isnt a quick connect at the trans cooler
01-26-2014
so the transmission is the difficult aspect of this swap. i ask because my gt trans has 170,000 on it and to be honest looks like the fluid has never been changed so i would like to get this tranny in it hoping that it will have more life in it...... as for the motor is it just drop it in and start sort of thing after i figure out the harness and pcm ?
01-26-2014
You will need a tb, tb adapter, and fuel rails at least
01-26-2014
from a series 3 or series 2 supercharged?
01-26-2014
http://www.grandprixforums.net/showt...ghlight=switch you'll need to do this to the tranny.
your best best is to use the old cars pcm tune it to the tranny gear change and call it done. use the new cars radiator and its tranny lines. get that adapter plate so you re use your old TB.
01-26-2014
Series 2 fuel rail
01-26-2014
he would have to use the 99 cars fuel rail. cause thats what that car is set up to use.
01-26-2014
You need a 97-03 l67 fuel rail
01-26-2014
Fuel rail and the injectors from supercharged engine L67.
01-26-2014
well he could use the l32 injectors in a pinch...just swap connectors
01-26-2014
Ive heard the newer style injectors are better anyway
01-26-2014
Im not trying to be sarcastic but learning the wiring diagrams and how to use a multimeter could make this a whole lot easier than swapping a bunch of parts and cost a ton less. Besides if you have the entire 2004 car I'd use as much electronics as I could from the 04 so that that its mostly oem wiring, the rest is just body harness.
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