Transmission compatibilty 2003 cts
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, Transmission compatibilty 2003 cts in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Will automatic transmissions from 2004-2006 3.6L work in a 2003 3.2L? Im looking for a used transmission and all the ...
  1. #1
    chase2000gt is offline Cadillac Owners Member
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    Transmission compatibilty 2003 cts

    Will automatic transmissions from 2004-2006 3.6L work in a 2003 3.2L?

    Im looking for a used transmission and all the units with low miles are all newer.

    Thanks!

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  3. #2
    jran0823's Avatar
    jran0823 is offline Cadillac Owners Enthusiast
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    The 2003 AT is a Getrag while 04-07 are Aisin's. I think the 3.2 had its own trans but I'm not a 100%.

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    warriorpluto is offline Cadillac Owners Member
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    Bolt pattern different?

  5. #4
    concorso is offline Cadillac Owners Master
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    Re: Transmission compatibilty 2003 cts

    Quote Originally Posted by jran0823 View Post
    The 2003 AT is a Getrag while 04-07 are Aisin's. I think the 3.2 had its own trans but I'm not a 100%.
    Youre not 0% sure.

    ----------

    Quote Originally Posted by chase2000gt View Post
    Will automatic transmissions from 2004-2006 3.6L work in a 2003 3.2L?

    Im looking for a used transmission and all the units with low miles are all newer.

    Thanks!
    All 1st gen CTS used the same 5L40E automatic trans from GM. The 04-07s used a different V6, but this swap is very doable and has been done.

  6. #5
    TunixComplex is offline Cadillac Owners Enthusiast
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    Re: Transmission compatibilty 2003 cts

    Quote Originally Posted by concorso View Post
    Youre not 0% sure.

    ----------

    All 1st gen CTS used the same 5L40E automatic trans from GM. The 04-07s used a different V6, but this swap is very doable and has been done.
    What about the 03 3.2l's manual tranny?

  7. #6
    concorso is offline Cadillac Owners Master
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    Re: Transmission compatibilty 2003 cts

    If the OP was talking about manual trans, JRAN would have been correct. 3.2L with manual trans all used the 5spd Getrag. 3.6L with MT all used the Aisin. The 3.2L with MT had optional 3.73 gears as well. It was very close to the 3.6L with AT in a striaght line

  8. #7
    jran0823's Avatar
    jran0823 is offline Cadillac Owners Enthusiast
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    I thought that was the case with the auto as well, because I have found Getrag on my trans as well. As far as all the 5L40-E's being the same isn't true either, if you look at the side tag on your trans they're is a tag and there is 2 different versions.

  9. #8
    chase2000gt is offline Cadillac Owners Member
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    Re: Transmission compatibilty 2003 cts

    Quote Originally Posted by concorso View Post
    Youre not 0% sure.

    ----------

    All 1st gen CTS used the same 5L40E automatic trans from GM. The 04-07s used a different V6, but this swap is very doable and has been done.
    So what's required to do the swap?

  10. #9
    concorso is offline Cadillac Owners Master
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    Re: Transmission compatibilty 2003 cts

    Quote Originally Posted by jran0823 View Post
    I thought that was the case with the auto as well, because I have found Getrag on my trans as well. As far as all the 5L40-E's being the same isn't true either, if you look at the side tag on your trans they're is a tag and there is 2 different versions.
    07 5l40e have allready been installed in 03's, Im sure its much easier then installing any manual in an auto equipped car. A skilled mechanic should have little problem. The 5L40e is a GM transmission built in France.

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