Getting my Differential rear end carrier replaced on Friday
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2009-2014 Cadillac CTS-V General Discussion Discussion, Getting my Differential rear end carrier replaced on Friday in Cadillac CTS-V Series Forum - 2009-2014; It's made a gear whine since I got the car @ around 50 mph, pretty loud can even hear it ...
  1. #1
    1997BlackETC's Avatar
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    Getting my Differential rear end carrier replaced on Friday

    It's made a gear whine since I got the car @ around 50 mph, pretty loud can even hear it with the radio on, soooo, the dealer ordered it today and will replace it Friday, it's an expensive part, looks to list around 2 grand. They are covering it under warrantee. Be good to get that taken care of.

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    Trapspeed's Avatar
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    Great news. I was elated to hear the dealership I'm speaking to now ordered me one without even seeing my car. Between that and the new blower I'll be sailing!

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    1997BlackETC's Avatar
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    Re: Getting my Differential rear end carrier replaced on Friday

    Great, I know you've been after them for a while on the blower with the noise, your car will be quiet after, nice. I really can't complain at all about GM lately and the dealer I'm going to now (Coast Cadillac in Sarasota) is amazing, they are really on top of things. I kinda knew sooner or later the carrier would have to be changed. With that type of noise it means things just did not wear in properly from the start. I'm not going to take the car over 60 mph for the first 1000 miles after it's done and totally baby it. I'm going to tell them to be really careful who they let test drive the car right after the job is done, I don't want it beat on right after the install, that's all I'd need is to have the same problem again. My car had 350 miles on it when I got because it was picked up from a distant dealer so who knows how the car was treated in those miles, I was careful for the first 1000 miles.

    I asked the service manager if they could install some 4:11 gears, his answers was ah nope. So 3:23 it'll be. Probably good anyhow because i'm always complaining about gas mileage and that woulda made matters worse, lol. Maybe the new gears if worn in right will have a little less friction and I'll get a little better mileage?

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    USAFRET is offline Cadillac Owners Fanatic
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    Re: Getting my Differential rear end carrier replaced on Friday

    Interesting observation on my recently purchased 2011 coupe. I just turned 4800 miles but it too has a drive line "whine" that is especially loud just at 45 MPH. I'm going to drive everyday for a week or two before I go any further, but it is noisier than any other car I have owned lately. I thought it might be a V thing.

    More to follow.

  6. #5
    cts-v ls6 is offline Cadillac Owners Fanatic
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    Re: Getting my Differential rear end carrier replaced on Friday

    Have a 2010 V2, been there, done that on both rear end and blower. Now have 88k miles and she runs like a new one. No gear whine and no blower whine, although I did put in a solid isolator.

    Jack

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    Re: Getting my Differential rear end carrier replaced on Friday

    Yep, it happens sometimes with these cars. I was going to put it off doing it, but I'm sure there is already a lot of metal filings in the fluid and it will only get worse. When those gears don't break in right they wear excessively.

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    Re: Getting my Differential rear end carrier replaced on Friday

    Got the job done today, only took about 3 hours, no more noise from the rear end. Just gonna take it real easy with the car for the next 500 miles.

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    RaVeNous is offline Cadillac Owners Enthusiast
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    Re: Getting my Differential rear end carrier replaced on Friday

    Describe this sound.

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    Quote Originally Posted by RaVeNous
    Describe this sound.
    Mine hums low pitch at 35-40 MPH at a cruise. Like a harmonic sound coming from behind you. When you give it a little gas, gone.

    Quote Originally Posted by 1997BlackETC
    Got the job done today, only took about 3 hours, no more noise from the rear end. Just gonna take it real easy with the car for the next 500 miles.
    Outstanding! I'm ready for mine.

  11. #10
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    Re: Getting my Differential rear end carrier replaced on Friday


  12. #11
    NM11CTSV is offline Cadillac Owners Member
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    I have a 2011 with 22k on it and I hear a faint hum of some sort at 40 when I'm under light load from the rear, when I let off the gas, it seems to go away.

    Does this sound like the problem described?

    Just got the car so idk.

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    Quote Originally Posted by 1997BlackETC
    Great, I know you've been after them for a while on the blower with the noise, your car will be quiet after, nice. I really can't complain at all about GM lately and the dealer I'm going to now (Coast Cadillac in Sarasota) is amazing, they are really on top of things. I kinda knew sooner or later the carrier would have to be changed. With that type of noise it means things just did not wear in properly from the start. I'm not going to take the car over 60 mph for the first 1000 miles after it's done and totally baby it. I'm going to tell them to be really careful who they let test drive the car right after the job is done, I don't want it beat on right after the install, that's all I'd need is to have the same problem again. My car had 350 miles on it when I got because it was picked up from a distant dealer so who knows how the car was treated in those miles, I was careful for the first 1000 miles.

    I asked the service manager if they could install some 4:11 gears, his answers was ah nope. So 3:23 it'll be. Probably good anyhow because i'm always complaining about gas mileage and that woulda made matters worse, lol. Maybe the new gears if worn in right will have a little less friction and I'll get a little better mileage?
    You can easily get 3:73's.... Just have the dealer order the replacement rear for a CTS-V with a 6-speed manual transmission instead of the automatic.. Same housing, same installation... I'm not sure exactly on all of the particulars.. But, you will need either a handheld tuner like the diablosport Trinity or a professional tune with HpTuners etc to recalibrate the speedo..

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    Re: Getting my Differential rear end carrier replaced on Friday

    Quote Originally Posted by NM11CTSV View Post
    I have a 2011 with 22k on it and I hear a faint hum of some sort at 40 when I'm under light load from the rear, when I let off the gas, it seems to go away.

    Does this sound like the problem described?

    Just got the car so idk.
    Hello NM11CTSV,

    Congrats on recently getting your vehicle. I hope you are enjoying it so far. As for as the noise issue you are experiencing, which could be similar to others on this forum thread, I recommend taking your vehicle into the dealership. It won't hurt to get it checked out, especially if it is something such as metal filings in the fluid, which 1997BlackETC mentioned in his earlier post, that could possibly get worse with time. If you would like help with setting up an appointment or want to discuss anything further, please let us know. We can also be reached via private message.

    Sincerely,

    Laura M.
    Cadillac Customer Service

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    StoneCrab is offline Cadillac Owners Fanatic
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    Re: Getting my Differential rear end carrier replaced on Friday

    Back in 09 when I bought my sedan the common advice was to change the diff fluid at around 1000 miles. Is that still the case? I did so, and never experienced any noise or problems even after a couple HPDE days in the car (other than diff overtemp warnings). If I recall, there were some that were underfilled from the factory so changing the fluid not only flushed any particles but made sure it was properly filled.

  16. #15
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    Changing the diff fluid is as easy as an oil change. I'd do that first.

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