axle ratio
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2008-2013 Cadillac CTS Performance Mods Discussion, axle ratio in Cadillac CTS Second Generation Forum - 2008-2013; The rpo code list for my car has a G80 DIFFERENTIAL, LIMITED SLIP and GU5 AXEL REAR, 3.23 RATIO. Does ...
  1. #1
    jimtreber is offline Cadillac Owners Member
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    axle ratio

    The rpo code list for my car has a G80 DIFFERENTIAL, LIMITED SLIP and GU5 AXEL REAR, 3.23 RATIO. Does this mean there are other ratios for the cts or 3.23 is for all?

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  3. #2
    ncscons is offline Cadillac Owners Fanatic
    Automobile(s): 2011 CTS 3.6 AWD
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    Re: axle ratio

    Pretty sure 3.23 is for the AWD so the fuel economy is closer to the RWD car. The RWD has a shorter rear end but I can't remember the number. Maybe 3.73?

  4. #3
    cawengr's Avatar
    cawengr is offline Cadillac Owners Fanatic
    Automobile(s): 2011 CTS Performance Coupe -3.6 DI 6 Speed Manual
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    The performance option with rear wheel drive is a 3:73 posit reaction rear end

  5. #4
    jimtreber is offline Cadillac Owners Member
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    Thread Starter

    Re: axle ratio

    Would the 3.73 be for both manual and automatic transmissions?

  6. #5
    pinkguy is offline Cadillac Owners Member
    Automobile(s): '09CTS 3.6DI RWD GoldMist/Cashmere
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    Re: axle ratio

    Hi to all
    let me throw in, what I have seen in writing.
    I got two build sheets, 2011 CTS 3.6DI 6sp-AT Wagon RWD and 2011 CTS 3.6DI 6sp-AT Coupe, RWD
    Both had RPO G80 for Limited Slip Positraction.
    The Coupe lists RPO GT4 for 3.73 rear ratio
    The Wagon lists RPO GU6 for 3.42 rear ratio

    pinkguy

  7. #6
    KensCTS is offline Cadillac Owners Member
    Automobile(s): CTS 2011
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    Re: axle ratio

    I have been researching this. Appears to be a 3.23, 3.42 and 3.73. My CTS performance 3.6L has the 3.42. Below is from my build sheet. I believe the GT4 is the 3.73. I am looking to get a used 3.73 off ebay and replace my 3.42. Anyone do this? Drop in replacement? Then I'll have to work on updating the speedo.
    GU6 AXLE,REAR,3.42 RATIO 3.42R(GU6)
    G80 AXLE,REAR,POSITRACTION,LIMITED SLIP POSITRACTION L/SLIP R/AXL(G80)

  8. #7
    ztollon's Avatar
    ztollon is offline Cadillac Owners Fanatic
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    Quote Originally Posted by KensCTS
    I have been researching this. Appears to be a 3.23, 3.42 and 3.73. My CTS performance 3.6L has the 3.42. Below is from my build sheet. I believe the GT4 is the 3.73. I am looking to get a used 3.73 off ebay and replace my 3.42. Anyone do this? Drop in replacement? Then I'll have to work on updating the speedo. GU6 AXLE,REAR,3.42 RATIO 3.42R(GU6) G80 AXLE,REAR,POSITRACTION,LIMITED SLIP POSITRACTION L/SLIP R/AXL(G80)
    chances are it will throw off your abs and traction control systems.

  9. #8
    SFVetteman's Avatar
    SFVetteman is offline Cadillac Owners Enthusiast
    Automobile(s): 2014 CTS 3.6 Premium, 1999 Corvette,370 RWHP & other mods
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    Re: axle ratio

    Quote Originally Posted by ztollon View Post
    chances are it will throw off your abs and traction control systems.
    I doubt that would happen. I changed out my 2.73 diff with a 3.42 in my '99 Vette and no problems with abs or traction control or anything else. The PCM reads speed at the wheels and while it can be somewhat sensitive to tire diameter it doesn't seem to care what the final drive ratio is.

    Bill

  10. #9
    everestx's Avatar
    everestx is offline Cadillac Owners Member
    Automobile(s): 2008 CTS 3.6 LLT
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    There are rumors the 3.91 (1LE) gears fit our carrier.
    I've yet to see installed confirmation of this but it is woth noting. Lpe and a few others make them.

    1st gear in an auto will be a beast but you will see much higher realized torque as a result

  11. #10
    Embassy_'s Avatar
    Embassy_ is offline Cadillac Owners Member
    Automobile(s): 2008 1SB DI 3.6L AWD CTS
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    Re: axle ratio


  12. #11
    KensCTS is offline Cadillac Owners Member
    Automobile(s): CTS 2011
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    Thanks for the leads. I am looking at the 3.91LPE and thinking I might remove the carrier and have the gears replaced. I'll let everyone know how it goes

  13. #12
    glava2876 is offline Cadillac Owners Member
    Automobile(s): 11 SRX AWD Luxury 14 CTS RWD Performance Coupe
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    Re: axle ratio

    Quote Originally Posted by cawengr View Post
    The performance option with rear wheel drive is a 3:73 posit reaction rear end
    I have been going through my codes list and my 2014 Performance coupe has GT4, so it came with the 3:73 & G80 positraction .
    I have added a Magnaflow cat back and am amazed at how fast this car feels -it is louder and not everyone may like it, but my wife does!

  14. #13
    ltdltc's Avatar
    ltdltc is offline Cadillac Owners Fanatic
    Automobile(s): 2010 CTS4 Performance Sport Wagon
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    Re: axle ratio

    Quote Originally Posted by KensCTS View Post
    Thanks for the leads. I am looking at the 3.91LPE and thinking I might remove the carrier and have the gears replaced. I'll let everyone know how it goes
    Is that an option for the 2010+ Camaro?

  15. #14
    everestx's Avatar
    everestx is offline Cadillac Owners Member
    Automobile(s): 2008 CTS 3.6 LLT
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    Yes. 1le is the performance/track package

  16. #15
    KensCTS is offline Cadillac Owners Member
    Automobile(s): CTS 2011
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    I called LPE, they said the 3.91 for the Camero wont fit the CTS/3.6/RWD, to bad. Best upgrade seems to be the 3.73, I have seen the complete used axle carrior for around $600-$900. Guess I am going to try this.

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