Stock rear differential strength
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2008-2013 Cadillac CTS Performance Mods Discussion, Stock rear differential strength in Cadillac CTS Second Generation Forum - 2008-2013; Guys, how much HP/torque can the stock rear differential handle before it needs upgraded to the cast iron V diff. ...
  1. #1
    Big_kid is offline Cadillac Owners Member
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    Stock rear differential strength

    Guys, how much HP/torque can the stock rear differential handle before it needs upgraded to the cast iron V diff.

    Also did the stock V6 diff ever come in (G80) limited slip.

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  3. #2
    kkuz is offline Cadillac Owners Connoisseur
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    Re: Stock rear differential strength

    LSD comes with Performance package.

  4. #3
    Long's Avatar
    Long is offline Cadillac Owners Master
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    Re: Stock rear differential strength

    Not all performance pkg Gen II CTS' came with SPID G80.
    Buyer beware.
    silversport likes this.

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    Padgett's Avatar
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    Re: Stock rear differential strength

    Personally would rather have a 3.23 than the 3.73. Would like to be under 2k rpm at 70 mph. Mine has the aluminum case and LSD. Were other ratios available with G80 ?

  6. #5
    Joseph Upson is offline Cadillac Owners Enthusiast
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    Re: Stock rear differential strength

    Quote Originally Posted by Padgett View Post
    Personally would rather have a 3.23 than the 3.73. Would like to be under 2k rpm at 70 mph. Mine has the aluminum case and LSD. Were other ratios available with G80 ?
    3.42, which would put you right at ~2100. I believe the 3.73 is likely only mated to the manual transmission, although at ones request the 3.73 might have been available for the auto, I doubt it given how short first gear would be, not to mention the associated fuel "noconomy".

    I looked this subject up some time ago and arrived at the conclusion likely from GMParts based on what was offered that the 3.23, 3.42 and 3.73 were the only options available to the second gen. I lifted the info below from a GM pdf so not all listed were options.
    https://d354nuoz4t18d4.cloudfront.ne...?cb=1543219590



    GU1 AXLE,REAR,2.41 RATIO
    GU2 AXLE,REAR,2.73 RATIO
    GU3 AXLE,REAR,2.93 RATIO
    GU4 AXLE,REAR,3.08 RATIO
    GU5 AXLE,REAR,3.23 RATIO
    GU6 AXLE,REAR,3.42 RATIO
    GT4 AXLE,REAR,3.73 RATIO
    wcthunder and CaddyFred like this.

  7. #6
    wcthunder's Avatar
    wcthunder is online now Cadillac Owners Connoisseur
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    Re: Stock rear differential strength

    Quote Originally Posted by Joseph Upson View Post
    3.42, which would put you right at ~2100. I believe the 3.73 is likely only mated to the manual transmission, although at ones request the 3.73 might have been available for the auto, I doubt it given how short first gear would be, not to mention the associated fuel "noconomy".

    I looked this subject up some time ago and arrived at the conclusion likely from GMParts based on what was offered that the 3.23, 3.42 and 3.73 were the only options available to the second gen. I lifted the info below from a GM pdf so not all listed were options.
    https://d354nuoz4t18d4.cloudfront.ne...?cb=1543219590


    GU1 AXLE,REAR,2.41 RATIO
    GU2 AXLE,REAR,2.73 RATIO
    GU3 AXLE,REAR,2.93 RATIO
    GU4 AXLE,REAR,3.08 RATIO
    GU5 AXLE,REAR,3.23 RATIO
    GU6 AXLE,REAR,3.42 RATIO
    GT4 AXLE,REAR,3.73 RATIO

    I have GT4. Good info!

  8. #7
    Joseph Upson is offline Cadillac Owners Enthusiast
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    Re: Stock rear differential strength

    Quote Originally Posted by wcthunder View Post
    I have GT4. Good info!
    It should come off the line like fire if it's an automatic.
    Here is some more valuable info;

    Steering ratio:

    FE2 RWD: 15.5
    FE2 AWD: 16.17
    FE3 RWD: 15.4

    Steering turns, lock-to-lock:

    FE2 RWD: 2.6
    FE2 AWD: 2.8
    FE3 RWD: 2.5

    Turn circle (ft / m):

    FE2 RWD: 37.47 / 11.42
    FE2 AWD: 38.98 / 11.88
    FE3 RWD: 36.75 / 11.20
    CaddyFred likes this.

  9. #8
    Long's Avatar
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    Re: Stock rear differential strength

    All RWD coupes got GT4, 3.73 axle ratio.
    TheFlash likes this.

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    Re: Stock rear differential strength

    Interesting. Really makes me wonder what demographic group they were aiming for. Last car I recall that came with a 3.73 was the 1st gen Z-28 Camaro.

  11. #10
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    jayoldschool is offline Super Moderator
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    Re: Stock rear differential strength

    Not you, lol
    silversport, HurstGN and CaddyFred like this.

  12. #11
    acstudios is online now Cadillac Owners Fanatic
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    Re: Stock rear differential strength

    I have a G80/GU6 mated to my POS AY6 gear grinder.

  13. #12
    Joseph Upson is offline Cadillac Owners Enthusiast
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    Re: Stock rear differential strength

    Quote Originally Posted by Padgett View Post
    Interesting. Really makes me wonder what demographic group they were aiming for. Last car I recall that came with a 3.73 was the 1st gen Z-28 Camaro.
    Probably not a demographic thought at all. The coupe looks faster than the sedan and 3.73 gears should leave no question about that suspicion, because it should be. That's probably where your missing fuel economy is. I have the 3.42 ratio and if I ever bump the power up enough to justify it I'd probably trade them for the 3.23 for an mpg bump along with the additional power.

  14. #13
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    Re: Stock rear differential strength

    Well first gear is probably more than many can handle, particularly with posi. I have one merge lane that visibility back on the 45mph through road is nill (underpass butresses) until you get almost to the end of the lane so have to be at a creep or stop then accelerate hard in a 30 degree angle to merge. If any Florida ice has dropped, it can be interesting (why wet traction is so important to me & want rear tires with a contact patch I can load without relying on fractals)

  15. #14
    wcthunder's Avatar
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    Re: Stock rear differential strength

    Quote Originally Posted by wcthunder View Post
    I have GT4. Good info!
    I have GT4, Steering ratio: FE2 RWD: 15.5, Steering turns, lock-to-lock: FE2 RWD: 2.6, Turn circle (ft / m): FE2 RWD: 37.47 / 11.42...Not concern what all models have...

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