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2008-2013 Cadillac CTS General Discussion Discussion, Diff fluid changes in Cadillac CTS Second Generation Forum - 2008-2013; Planning to change the front and rear diff fluid soon, the juddering while turning in a parking lot sucks. Do ...
  1. #1
    naiku is online now Cadillac Owners Fanatic
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    Planning to change the front and rear diff fluid soon, the juddering while turning in a parking lot sucks. Do I add the limited slip additive to the front and rear? Or just the rear?

    I have the G80 option code, want to make sure I get everything I need. And I really really to get rid of the awful judder at low speed turns.

    Just realized it's the transfer case that causes the shudder, what's needed to eliminate that?

    Thanks.

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  3. #2
    Long's Avatar
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    Re: Diff fluid changes

    There are some good step by step how-to's in the DIY/FAQ thread.

  4. #3
    naiku is online now Cadillac Owners Fanatic
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    Quote Originally Posted by Long View Post
    There are some good step by step how-to's in the DIY/FAQ thread.
    Spent some time reading those last night, it's how I realized it's the transfer case that causes the juddering. Trying to find somewhere closer than an hour's drive from me that carries 3/8" key stock to make the little tool for the transfer case fill plug.

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    Re: Diff fluid changes

    I have RWD so I haven't read anything about servicing the transfer case but would these work?

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    naiku is online now Cadillac Owners Fanatic
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    Re: Diff fluid changes

    The dimensions listed don't quite make sense .... 5.8 x 2.7 x 0.8 inches but even the smallest one of those 0.8" by the time you add in the ratchet head will be too big. In this thread there is a picture showing that the 3/8" square key works best when cut to just under an inch. Assuming that bit on Amazon is 0.8" then you would need the ratchet head to be 0.2" thick at the absolute most.

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    Re: Diff fluid changes

    Haven't tried the caddy but on other GM cars I just use the end of a 3/8 extension without a socket.
    AndyT3 likes this.

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    Long's Avatar
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    Re: Diff fluid changes

    Quote Originally Posted by Padgett View Post
    Haven't tried the caddy but on other GM cars I just use the end of a 3/8 extension without a socket.
    There's no room.
    Try a pass through ratchet.

  9. #8
    naiku is online now Cadillac Owners Fanatic
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    Quote Originally Posted by Long View Post
    There's no room.
    Try a pass through ratchet.
    I picked up some 3/8" square key stock yesterday, just need to cut a small piece off. I'm hopeful the fill plug is not too tight that I can just get a wrench onto the square with it inserted in the plug.

    Just waiting on all the fluids to be delivered before I make a start. If I remember I may take some pictures to add to the DIY threads.
    HurstGN and KirkEllis like this.

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    Re: Diff fluid changes

    Quote Originally Posted by naiku View Post
    I picked up some 3/8" square key stock yesterday, just need to cut a small piece off. I'm hopeful the fill plug is not too tight that I can just get a wrench onto the square with it inserted in the plug.

    Just waiting on all the fluids to be delivered before I make a start. If I remember I may take some pictures to add to the DIY threads.
    Good luck. More pics would be beneficial.

  11. #10
    Lifespeed is offline Cadillac Owners Enthusiast
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    Re: Diff fluid changes

    I can't remember the details from a few months back, but I know I just used regular hand tools and didn't have to make anything.

  12. #11
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    Re: Diff fluid changes

    GM additive, rear diff only. No G80 up front ;-)

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    Re: Diff fluid changes

    I had no idea it was that tight around the fill plug. Glad you got what you needed to do the job.

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    Re: Diff fluid changes

    Was told by an ASE tech (while in the Cadillac service area) to add the limited slip front & rear to help with the judder you are experiencing.

  15. #14
    naiku is online now Cadillac Owners Fanatic
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    Re: Diff fluid changes

    Quote Originally Posted by KirkEllis View Post
    Was told by an ASE tech (while in the Cadillac service area) to add the limited slip front & rear to help with the judder you are experiencing.
    I've read that somewhere else as well, but the majority say to use the additive in the rear and the anti shudder in the transfer case. By this time next week I should know, fluids should be here Monday so I may try to find time Tuesday evening to swap them out.
    KirkEllis likes this.

  16. #15
    redheadedrod is offline Cadillac Owners Connoisseur
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    Re: Diff fluid changes

    For the transfer case I found it easy to just lower the transmission mount to gain access to the fill port. I left the bolts away from the transfer case in just a few threads for alignment when reassembling, the two bolts by the transfer case I totally removed using a floor jack to hold the transmission mount...

    Did not have to remove anything else and was able to EASILY change and refill the transfer case. I also had the serpentine belt removal tool which make it much easier than other methods.

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