[riprocop]

Will I have any problems dropping in an 04 Monte Carlo SS engine to a 98 Pontiac GTP? Engine, wiring harness, exhaust? Anything else I should consider?

 

[Smaart Aas Saabr]

Both supercharged? Should be the same

 

[MrCritical]

I'd really be surprised if the wiring harness and ECM/PCM are the same.

 

[Triple-X08]

i would check with a salvage yard, they can tell if certain powertrains will swap or not.

 

[Smaart Aas Saabr]

I'd really be surprised if the wiring harness and ECM/PCM are the same.

Why? Both cars had OBD-II and were rated by the factory at 240 hp / 280 lb-ft...

Worse comes to worse use the 1998 wiring harness, and if any sensors don't fit the plugs, swap the sensors with the 1998 engine.

I put a 2003 Saturn VUE 3.0 V6 (OBD-II) into a 1994 Saab 900 SE that had a 2,5 engine (OBD I) and that had totally different PCM's and harnesses too and it worked out well.

 

[Triple-X08]

well, i agree i dont think the wire harness will work either, nor the pcm, its a complete generation difference in vehicles, series 2 engine but still different. also fuel rail and plug ins for sensors will be different, may look the same but there is always something different, and normally you dont recognize it until you get it back together and something doesnt fit right or whatever. at least that is the luck i have with swaps

 

[F14CRAZY]

It SHOULD work though you may have to swap a few external parts

 

[MrCritical]

Most times the PCM and wiring harnesses change from one year to the next, and you're talking about 6 years.

I didn't say it couldn't be done.