Thread: swap a 98 sc 3800 into 02 gt na?

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  1. #1 swap a 98 sc 3800 into 02 gt na? 
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    I have a 98 gtp rusted real bad but engine runs great slippery trans found an 02 gt with a locked up engine i should be able to just swap the sc 3800 in there and get a pcm tune? i should also swap the diff and passenger side axle too right?
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  2. #2 Re: swap a 98 sc 3800 into 02 gt na? 
    I live here. Slick2500's Avatar
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    Yes, but I would also swap the pcm and engine harness just to make things easier.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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  3. #3 Re: swap a 98 sc 3800 into 02 gt na? 
    Killa Bee Scottydoggs's Avatar
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    98 pcm wont work right in a 02 car. theres a lot of different things going on there. you'll need the gt pcm tuned or buy a canned tune for your situation.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  4. #4 Re: swap a 98 sc 3800 into 02 gt na? 
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    thanks,
    sounds like its a go.
    pull the motor and rusty 98 to the scrapper.
    the 2002 gt coupe i found looks great the girl said it has no rust guess we will see them rockers when i get there. she didn't know what i was asking when i said are rocker panels rusty. said she ran out of oil and the engine is toast.

    1997 Black GTP Coupe | 1997 Black GTP Coupe | 2001 Silver GTP Coupe | 2001 Red GTP Coupe
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  5. #5 Re: swap a 98 sc 3800 into 02 gt na? 
    I live here. Slick2500's Avatar
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    Quote Originally Posted by Scottydoggs View Post
    98 pcm wont work right in a 02 car. theres a lot of different things going on there. you'll need the gt pcm tuned or buy a canned tune for your situation.
    Um what? Yes it will 98-02 cars all use the same pcm, and hes getting a tune anyway. 97 and 03 are the oddball years for those gps.
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  6. #6 Re: swap a 98 sc 3800 into 02 gt na? 
    Killa Bee Scottydoggs's Avatar
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    lol this car sounds perfect, you'll have to get eyes on it to know.

    ive got a 02 pcm id like to unload, i think i could set up a 02 gt bin to run a sc engine. id have to ask around but i think its just copying the files over.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  7. #7 Re: swap a 98 sc 3800 into 02 gt na? 
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    Quote Originally Posted by Scottydoggs View Post
    lol this car sounds perfect, you'll have to get eyes on it to know.

    ive got a 02 pcm id like to unload, i think i could set up a 02 gt bin to run a sc engine. id have to ask around but i think its just copying the files over.
    Or he could do that and just sell the stock pcm to someone.
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    Superchargers take away horsepower
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  8. #8 Re: swap a 98 sc 3800 into 02 gt na? 
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    I just talked to some guy that wants to buy my 98 complete for 500.
    i know i can get a na 3800 out of a rear ended 4 dr 2001 for 200 or less.
    well now i just don't know what to do..
    going to get that 02 gt if it is truly no rust and undercoat it if it isn't already.
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  9. #9 Re: swap a 98 sc 3800 into 02 gt na? 
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    Run the 98 GTP PCM, tune it for the gear change and now have a 02 that doesnt care about emissions..

    SMGPFC Member #1
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  10. #10 Re: swap a 98 sc 3800 into 02 gt na? 
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    i cant wait.
    this is the first black sapphire metallic coupe i have ever found for sale.
    I have never seen it on a GTP coupe. Anybody else? Too bad this one is just a gt.
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  11. #11 Re: swap a 98 sc 3800 into 02 gt na? 
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    is that 2002 sapphire black metallic?
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  12. #12 Re: swap a 98 sc 3800 into 02 gt na? 
    I live here. Slick2500's Avatar
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    It looks like it is.
    2003 Redfire Metallic Chevy Tahoe Z71 - Airaid Modular Intake Tube, Flowmaster Exhaust.
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    Superchargers take away horsepower
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  13. #13 Re: swap a 98 sc 3800 into 02 gt na? 
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    Well not getting it but its still out there for sale.
    I did score a local 2001 silver GTP coupe with special edition interior with light grey inserts.
    It does have a little rust on the drivers rocker but runs smooth, shifts and drives. It just does not stop very well.
    It needs a serious brake job. The clear coat is pretty much gone. no ses light no airbag light. abs and brake light are on.
    Bose speakers with a newer aftermarket stereo with Bluetooth and whatnot. not bad for 950 bucks and I didn't have to haul it 200 miles home.

    1997 Black GTP Coupe | 1997 Black GTP Coupe | 2001 Silver GTP Coupe | 2001 Red GTP Coupe
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  14. #14 Re: swap a 98 sc 3800 into 02 gt na? 
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    Quote Originally Posted by Scottydoggs View Post
    lol this car sounds perfect, you'll have to get eyes on it to know.

    ive got a 02 pcm id like to unload, i think i could set up a 02 gt bin to run a sc engine. id have to ask around but i think its just copying the files over.
    Scott, you're better off flashing a GTP file over to the PCM in a full write, and then copying the GT trans settings. Sounds crazy I know, but sometimes when you modify a GT file you get MAP readings that don't work right.
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  15. #15 Re: swap a 98 sc 3800 into 02 gt na? 
    Killa Bee Scottydoggs's Avatar
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    that sounds like a good plan.....should he ask for it..... whats up with 02 pcm's? they only take 02 na or sc bins. i got 2 of these bastards.

    i got one other with the same part # out of a 01 regal it took a 98 bin for my car, but the other was out of a 02 GP those two wont play nice at all lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  16. #16 Re: swap a 98 sc 3800 into 02 gt na? 
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    You have to find the later OSID to put on the O2's, they can be finicky. Most of the later ones have the same service part# on them, it's the programming number that's different.
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  17. #17 Re: swap a 98 sc 3800 into 02 gt na? 
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    Here is the car if anyone else is interested. If it is still for sale in a 2 weeks i might get it.
    http://www.grandprixforums.net/threa...=1#post1334648
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  18. #18 Re: swap a 98 sc 3800 into 02 gt na? 
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    Reptile weren't our Grand Prixs built near where you live?
    We should get a big group together and cruise to the plant.
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  19. #19 Re: swap a 98 sc 3800 into 02 gt na? 
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    Yeah, they were built at Fairfax Assembly, about 30 minutes from me.
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  20. #20 Re: swap a 98 sc 3800 into 02 gt na? 
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    I Wonder if there is a warehouse nearby full of nos parts.
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