03 n* and trans in a 99 SLS
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Northstar Engines and System Technical Discussion Discussion, 03 n* and trans in a 99 SLS in Cadillac Engine Technical Discussion; I may be able to purchase a very low milage 2003 engine trans and wiring harness. I am going to ...
  1. #1
    mpe331lx is offline Cadillac Owners Member
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    03 n* and trans in a 99 SLS

    I may be able to purchase a very low milage 2003 engine trans and wiring harness. I am going to take a look at it tomorrow and get the details of what model car it came out of.

    I have a 99 SLS, I know that a 98/99 is the direct swap into my car.
    If this engine has all the accessories and harness, will I run into any major problems with the install or getting it running?

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    AJxtcman's Avatar
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    Re: 03 n* and trans in a 99 SLS

    Major problems.

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    mpe331lx is offline Cadillac Owners Member
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    Re: 03 n* and trans in a 99 SLS


  5. #4
    mpe331lx is offline Cadillac Owners Member
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    Re: 03 n* and trans in a 99 SLS

    Quote Originally Posted by AJxtcman View Post

    On second thoughts I know one way to put a 00+ engine in a 99 and prior car. This would be a direct bolt in and you would need the harness also. I can check for any wire reconfiguring, but it is a direct bolt in.

    A 00 to 02 Eldo.

    If I can get the harness and ECM, What will be the major things that I have to MOD?

  6. #5
    CadillacSTS42005's Avatar
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    Re: 03 n* and trans in a 99 SLS

    no no and um NO

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    Re: 03 n* and trans in a 99 SLS

    Quote Originally Posted by mpe331lx View Post
    If I can get the harness and ECM, What will be the major things that I have to MOD?
    Seville's are different. I need to take a look.

  8. #7
    mpe331lx is offline Cadillac Owners Member
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    Re: 03 n* and trans in a 99 SLS

    Quote Originally Posted by CadillacSTS2003 View Post
    no no and um NO
    OK, what are the actual reasons whay I could not MAKE it work in my car.

    Has anyone succsessfully done the swap?
    Are you saying no because it cant EASILY be done?

    Stripped down to the shell, is the 99 the same as an 03?

    It would be no different than me swapping an ls1 into my 97 Camaro:
    mostly everything is electronically and mechanically different, but skilled people commonly swap them into the 93-97 and older camaros.
    If you ask the average F-body enthusiast if it can be done they will say no, This, this, and this is different.
    One that is determined to do the swap will find out exactly what needs to be done to succsessfully get it done. Thats all I am trying to do.


    Most Caddy owners would not go through the trouble of going through that, I'm not the traditional Caddy owner

    Most of my swap experience is in late model (maybe not so late any more) mustangs and camaros. I have swapped EFI motors into older carbed model cars, swapped from 4 bangers to v8s, swapped from pushrod 5.0s to DOHC 4.6s.

    Compared to what I'm used to the engine is clocked in the chassis the wrong way and there is a bit more electronics to deal with (no pony car has heated friggin seats )

    I guess my origional question has been answered, NO it will not go in without hassle.

    I got the car for a deal I could not pass up, and I now have found a 14K mile engine and trans for a deal that i may not be able to pass up either.

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    Re: 03 n* and trans in a 99 SLS

    [QUOTE=mpe331lx;1259338]OK, what are the actual reasons whay I could not MAKE it work in my car.

    Has anyone succsessfully done the swap?
    Are you saying no because it cant EASILY be done?

    Stripped down to the shell, is the 99 the same as an 03?[QUOTE]

    The blocks are different and the crank sensors are located differently. The cranks are different. This means you will need to run all the 00 to 03 stuff. 98 on up Seville's have the battery under the back seat. This means that the fuse box under the hood is the main plug in for the engine harness. Yes you will need to use a 03 harness and pcm. all the 03 accessories and some of the AC lines. They mount to the compressor differently. The heater hoses will need to be worked out also

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    Re: 03 n* and trans in a 99 SLS

    its a completely different transmission
    thats why

  11. #10
    mpe331lx is offline Cadillac Owners Member
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    Re: 03 n* and trans in a 99 SLS

    Quote Originally Posted by CadillacSTS2003 View Post
    its a completely different transmission
    thats why
    So I cant put an engine, wiring harness, ecu, and transmisson from an 03 seville in my car because it's a different trans?

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    Re: 03 n* and trans in a 99 SLS

    look
    you asked
    were answering
    you dont wanna listen then go for it
    the only way it would work is if you grab the entire wiring harness from headlight to taillight and all computers all components and install them on your cars chassis
    there were MAJOR design changes between those years not to mention any 96+ obd II Cadillac requires ALL computers in the car to be programmed with your cars vin and each cars vin has its own programming
    in order to do what your asking youd need to program your vin into that 03s pcm and keep the 03 pcms programming which CANNOT BE DONE because there is no tuners for the Northstar engine.
    ITS IMPOSSIBLE
    again
    NO NO and NO

  13. #12
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    Re: 03 n* and trans in a 99 SLS

    Quote Originally Posted by CadillacSTS2003 View Post
    look
    you asked
    were answering
    you dont wanna listen then go for it
    the only way it would work is if you grab the entire wiring harness from headlight to taillight and all computers all components and install them on your cars chassis
    there were MAJOR design changes between those years not to mention any 96+ obd II Cadillac requires ALL computers in the car to be programmed with your cars vin and each cars vin has its own programming
    in order to do what your asking youd need to program your vin into that 03s pcm and keep the 03 pcms programming which CANNOT BE DONE because there is no tuners for the Northstar engine.
    ITS IMPOSSIBLE
    again
    NO NO and NO

    I can put any VIN in a PCM that I want it.
    I have so many tuning programs I can't count. The GM program is the best!
    I can put the a 03 engine in a 99 Seville with out swapping any modules except the PCM.
    I have an 02 trans mated up to a 99 engine and I have the 02 valve body. I am running the 99 PCM.
    The 99 trans will work in an 00+ car and the 00+ trans will work in a 99 car with just a little help.

    All the computers do not get programed with the VIN.
    As a matter of fact I am shipping out 4 with two VIN's in each.
    I can knock it down to one, but it takes too long for nothing

    I can crank up the tune much more.

    My turd just got a new program and it is a blast.

    I picked up a half second.

    I still don't think you have a PCM with my program!!

    I think it was erased when it was installed!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    You have never given me the Numbers I asked for!!!!!!!!!!!

    Maybe I sent you Your program just to screw with you

    You know I like to do that

    Oh yeah I forgot

  14. #13
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    Re: 03 n* and trans in a 99 SLS

    lol
    i ment BESIDES you AJ
    but i assumed this is a you have to be there to do it type of thing
    it wasnt a personal shot at you AJ
    as i said before
    youre a N* tuner god

    but you dont have to be so mean to me

  15. #14
    AJxtcman's Avatar
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    Re: 03 n* and trans in a 99 SLS

    I was nice this time I did not add the gay
    See I can be nice
    Next time the evil may come out

  16. #15
    mpe331lx is offline Cadillac Owners Member
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    Re: 03 n* and trans in a 99 SLS

    Quote Originally Posted by CadillacSTS2003 View Post
    look
    you asked
    were answering
    you dont wanna listen then go for it
    the only way it would work is if you grab the entire wiring harness from headlight to taillight and all computers all components and install them on your cars chassis
    there were MAJOR design changes between those years not to mention any 96+ obd II Cadillac requires ALL computers in the car to be programmed with your cars vin and each cars vin has its own programming
    in order to do what your asking youd need to program your vin into that 03s pcm and keep the 03 pcms programming which CANNOT BE DONE because there is no tuners for the Northstar engine.
    ITS IMPOSSIBLE
    again
    NO NO and NO

    Insted of just "No, No , No". And "you cant do it", this time You gave me a little usable information this time. I needed to know the obstacles that I WILL have to overcome to do the swap. I need to know the exact reasons of "why it cant be done".

    Swapping harness' from head light to tail light on a same bodied car is not that hard at all (a little time cosuming), It all lays into place.
    That is the worst case scenario. I am going to look into the wiring diagrams between the two cars and see what is ACTUALLY different between the two cars main body harness.

    Most of the reasons that I've been given so far can be overcome.


    Quote Originally Posted by AJxtcman View Post
    I can put any VIN in a PCM that I want it.
    I have so many tuning programs I can't count. The GM program is the best!

    I can put the a 03 engine in a 99 Seville with out swapping any modules except the PCM.

    I have an 02 trans mated up to a 99 engine and I have the 02 valve body. I am running the 99 PCM.

    The 99 trans will work in an 00+ car and the 00+ trans will work in a 99 car with just a little help.

    All the computers do not get programed with the VIN.


    What are you using to program the ECM's, a Tech2 and factory GM software?

    If I had acess to a wrecked 03 and could take whatever I needed out of the car, What items would I NEED to swap over?

    Which computers need to match, (ECM and BCM?)

    Can the 03 ECM be re flashed to match my current BCM or vice versa (if thats the ones that need to match)

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