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  1. #1
    Donating Users Swiggles's Avatar
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    Default 03 Regal gs trans question.

    I have an 04 impala ss with an 03 Regal gs motor and trans. Can I simply swap in a 98-02 gtp trans? Is there a problem with the engine wiring harness that I could simply repin or is there more to it than that?

    No more GP 04 Impala SS Indy:
    Gen V 3.6|FWI|N* TB lq4 MAF|1.8 Rockers|F&R Plogs|ZZP 3" Catted DP|ZZP 2.5" Catback|

  2. #2
    Killa Bee Scottydoggs's Avatar
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    Default Re: 03 Regal gs trans question.

    you would need to do the pnp swap, google that with billboost37, the how to comes up.......or grab him, your local enough.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, 2.8, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW

  3. #3
    Donating Users Swiggles's Avatar
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    Default Re: 03 Regal gs trans question.

    Ok thanks scotty

    No more GP 04 Impala SS Indy:
    Gen V 3.6|FWI|N* TB lq4 MAF|1.8 Rockers|F&R Plogs|ZZP 3" Catted DP|ZZP 2.5" Catback|

  4. #4
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    Default Re: 03 Regal gs trans question.

    If you look around more, you should find a few posts by Dave at TEP that the VB etc are quite different on 03 vs any other year. 04 and up was different than 98-02 and 03.

  5. #5
    Donating Users Swiggles's Avatar
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    Default Re: 03 Regal gs trans question.

    But is that just the Grand Prix or is all of them in those years? I donít really care about the differences inside if itís just put the trans in, plug in the connectors, fill with fluid, and go. Or do I need to change things? I have to double check but I think there is already an external pnp switch on my impalaís trans.

    No more GP 04 Impala SS Indy:
    Gen V 3.6|FWI|N* TB lq4 MAF|1.8 Rockers|F&R Plogs|ZZP 3" Catted DP|ZZP 2.5" Catback|

  6. #6
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    Default Re: 03 Regal gs trans question.

    Brian.. it's not supposed to work. I didn't do a swap ever with an 03 using anything but an 03 for that very reason. Never really dug into it though. Dave and others said 03 was the unicorn year and that's in all cars. First heard about this on Bonnevilles, and it applied to all platforms with the 4T65. Might be worth a call to TEP to triple check though.

    Here's what I do:
    If you have a 97-02 use a 97-02
    If you have an 03, life sucks use 03
    If you have an 04-08 use 04-08

  7. #7
    GXP Level Member GTPpower's Avatar
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    Default Re: 03 Regal gs trans question.

    Quote Originally Posted by BillBooost37 View Post
    Brian.. it's not supposed to work. I didn't do a swap ever with an 03 using anything but an 03 for that very reason. Never really dug into it though. Dave and others said 03 was the unicorn year and that's in all cars. First heard about this on Bonnevilles, and it applied to all platforms with the 4T65. Might be worth a call to TEP to triple check though.

    Here's what I do:
    If you have a 97-02 use a 97-02
    If you have an 03, life sucks use 03
    If you have an 04-08 use 04-08
    I see what you did there.

    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  8. #8
    Donating Users Swiggles's Avatar
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    Default Re: 03 Regal gs trans question.

    Iíll have to get the number off my trans and confirm, stupid gm.

    No more GP 04 Impala SS Indy:
    Gen V 3.6|FWI|N* TB lq4 MAF|1.8 Rockers|F&R Plogs|ZZP 3" Catted DP|ZZP 2.5" Catback|

  9. #9
    Donating Users Swiggles's Avatar
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    Default Re: 03 Regal gs trans question.

    Alright so I donít have a pnp switch . Now if I get an 04 impala ss engine wiring harness can I use the 98-02 trans? Or it needs to be an 04-08 trans?

    No more GP 04 Impala SS Indy:
    Gen V 3.6|FWI|N* TB lq4 MAF|1.8 Rockers|F&R Plogs|ZZP 3" Catted DP|ZZP 2.5" Catback|

  10. #10
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    Default Re: 03 Regal gs trans question.

    short answer the shizzle inside is too different. If you wanna put a pnp on a non pnp trans.. it's cake. If you wanna use an internal vs external, that's cake too. The problem isn't wiring. It's that they changed from an apple to an orange There's differences that the pcm etc may say.. go pound sand.

    Obviously.. you can drop it in and give it a try. Remember this though.. Derek aka BobC's brother. He put a W body trans in his Riv and the rear trans mount support webbing wasnt there. He didn't make it around the block before the case cracked and he was pushing a 5000lb Riv home. Spent the moola to have Claudio's trans guy put those guts into the right case and ... then that worked. There's some stuff we can't quite get around no matter how much we hope it's going to work.

  11. #11
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    Default Re: 03 Regal gs trans question.

    ps.. you live too close to too many yards to claim you don't have a pnp laying around.

  12. #12
    Donating Users Swiggles's Avatar
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    Default 03 Regal gs trans question.

    Lol Iím sure I have one on the parts trans in my garage.

    So I need to swap out the internal wiring harness? Or the valve body and other stuff too?

    Currently I have an 04 impala ss with motor/trans from 03 Regal gs according to the papers I found in the car when I got it. Pcm is the stock 04 impala ss one that I tuned. I had to change the reluctor wheel settings or whatever itís call in the tune for the trans to shift right. I donít know for sure which engine wiring harness I have, I think is from the gs because it doesnít fit quite right a couple spots.

    04 impala
    03 gs motor/trans
    04 impala pcm
    Wiring harness?
    Last edited by Swiggles; 1 Week Ago at 08:01 AM.

    No more GP 04 Impala SS Indy:
    Gen V 3.6|FWI|N* TB lq4 MAF|1.8 Rockers|F&R Plogs|ZZP 3" Catted DP|ZZP 2.5" Catback|

  13. #13
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    Default Re: 03 Regal gs trans question.

    Do a bit more searching, I forget if it's 04+ or 03 that someone swapped a couple of wires at the trans in order to use it. I do know that from 98-02 vs 04-08 you do have to change out the valve body/channel plate and wiring plus the pump shaft in order for it to work. Otherwise most of the parts are swappable.

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