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Cadillac STS Forum - 2005 through 2012 Discussion, Diff Swap 05 STS in Past Cadillac Vehicle Discussion; just dropped my diff today and tag says i have i=2.73 15793747 but is it limited slip??? because i spin ...
  1. #16
    Charles Warren's Avatar
    Charles Warren is offline Cadillac Owners Fanatic
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    Re: Diff Swap 05 STS

    just dropped my diff today and tag says i have i=2.73 15793747 but is it limited slip??? because i spin both tires i see 2 marks when i burnout

  2. #17
    1BadCadSTS's Avatar
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    2.73 is standard rear end. I believe g80 is limited slip rpo.

  3. #18
    Charles Warren's Avatar
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    Re: Diff Swap 05 STS

    oh ok so I could have 2.73 with lsd. I think I do I'll check rpo tag later. I just put 2 gallons of 112 and car runs so smooth now. And I encourage you all to install poly engine mounts and poly diff bushing. My car has no more shake and gets better mpg and feels like she wants to run away

  4. #19
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    Re: Diff Swap 05 STS

    Anyone know if the 2.73 is available with Posi/Limited Slip (LSD)?
    The 2.73 I had in my previous STS, did NOT have LSD.
    Happy Motoring

  5. #20
    dkozloski's Avatar
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    Re: Diff Swap 05 STS

    I can't wait until somebody tries this. Everything about the car that involves a calculation that includes speed is going to be haywire. Speedometer, odometer, gear shifts, mileage, range, OLM, ABS, stability system, ECM, and NAV. I'm betting there will be some more as well because of the tight integration of the computer systems. The relationships between all these factors is determined by one long data word that must be obtained from GM Techline. If somebody somewhere has already put together your partiular combination they might be able to help you. If not it can cost a high five figures for them to develope it for you which they won't do anyhow.
    Good Luck with your dream.
    Don't mess with Binky Bear!


  6. #21
    EChas3's Avatar
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    Re: Diff Swap 05 STS

    2.73 to 3.42 is a big differential; over 25%. Trust me, I drive both a 2.73 & a 3.23; only an 18% difference.

  7. #22
    btlegacy is offline Cadillac Owners Member
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    Re: Diff Swap 05 STS

    I believe the 2.73 never came with an LSD. I would buy another LSD unit and then swap the ring and pinion from yours to it. You may have to order different shims for it to be set up correctly

  8. #23
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    Re: Diff Swap 05 STS

    From what I have read, the Ring gear is welded on, to save weight.
    There are NO bolts.
    Swapping the whole third member is the only way.
    Did they use different axels on the LSD, as opposed to Non-LSD ?

    Can't the dealer re-calibrate the speed input, changeing the speedo,shifts, etc,
    Tire size change,or rear end gear change ?
    Happy Motoring !

  9. #24
    btlegacy is offline Cadillac Owners Member
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    Re: Diff Swap 05 STS

    I have my old carrier that I took and will split it to examine inside

  10. #25
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    Re: Diff Swap 05 STS

    Quote Originally Posted by Subsailor613 View Post
    From what I have read, the Ring gear is welded on, to save weight.
    There are NO bolts.
    Swapping the whole third member is the only way.
    Did they use different axels on the LSD, as opposed to Non-LSD ?

    Can't the dealer re-calibrate the speed input, changeing the speedo,shifts, etc,
    Tire size change,or rear end gear change ?
    Happy Motoring !
    The mathematical relationship between all the elements in the digital data system is determined by one long serially loaded data word that if I remember correctly is called a "V" word and must be calculated and validated separately for every legitimate combination of equipment and variables. GM claims this can cost into the high five figures. If this data word has already been developed for the variation you anticipate you might talk them into letting you use it but it can only be loaded by a dealer. This is not to be confused with the monkeying with shift points, fuel tables, and speed limiters that the tuners do.
    Don't mess with Binky Bear!


  11. #26
    btlegacy is offline Cadillac Owners Member
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    Re: Diff Swap 05 STS

    I believe that the ECM may be able to be modified based on other GM ECM's that I have worked with as this E55 ECM is supported by HP Tuners. We have adjusted gear changes for many other ECMs with HP Tuners and and are evening running a 3.42 CTS rear in our LS1 Miata which we were able to modify the tune for to support that Ratio.

  12. #27
    btlegacy is offline Cadillac Owners Member
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    Re: Diff Swap 05 STS

    I opened up the diff I took off from my 05 STS. It is a Non-LSD 3.42 diff and I do not see anything that is welded. Some pics below:






    Quote Originally Posted by Subsailor613 View Post
    From what I have read, the Ring gear is welded on, to save weight.
    There are NO bolts.
    Swapping the whole third member is the only way.
    Did they use different axels on the LSD, as opposed to Non-LSD ?

    Can't the dealer re-calibrate the speed input, changeing the speedo,shifts, etc,
    Tire size change,or rear end gear change ?
    Happy Motoring !

  13. #28
    Subsailor613's Avatar
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    Re: Diff Swap 05 STS

    I ONLY read it, I brought this to light, as it "may" be a possibility.
    In your case it is bolted, also, does not mean others are not welded.
    I question it also, Why would some be welded, and some not ?
    Great Pics,Thank You.
    Happy Motoring.

  14. #29
    dkozloski's Avatar
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    Re: Diff Swap 05 STS

    There is no damn way the ring gear could be welded to the carrier. The gear is highly heated and this would be destroyed by the heat of welding. Welding would warp both the ring gear and carrier making it impossible to set contact pattern and lash.
    Don't mess with Binky Bear!


  15. #30
    Subsailor613's Avatar
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    Re: Diff Swap 05 STS

    Great point of information, koz, I did not put any technical knowledge
    into saying it, as I only read it. In my younger years,I frequently changed out
    whole third member, But NEVER changed out
    a ring and pinion, so am NOT familiar with the setup on these.
    I wanted to do that, but the technical knowledge I did NOT posses,
    AND additional funds,stopped me COLD.
    At that time I wanted a 5.38/1 over a 4.11/1 locked, "Those were the days" !
    Happy Motoring.

    P.S. If I come across the article on welding the Ring Gear,
    I will post it here.
    Also we probably are NOT talking stick welding here.

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