"Wub-Wub" sound on tight turns from rear driver side...
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2004-2007 Cadillac CTS-V General Discussion Discussion, "Wub-Wub" sound on tight turns from rear driver side... in Cadillac CTS-V Series Forum - 2004 - 2007; I did some searching on this but nothing came up. I'm getting a "wub-wub" binding/unloading sound from the driver rear ...
  1. #1
    PJGross is offline Cadillac Owners Fanatic
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    "Wub-Wub" sound on tight turns from rear driver side...

    I did some searching on this but nothing came up.
    I'm getting a "wub-wub" binding/unloading sound from the driver rear corner during slow parking lot tight turns. It sounds like rubber or urethane loading/unloading.

    Used to only do it in reverse and full turn. Now sometimes it will occur in forward tight turns.

    Last summer it was doing the same thing. I changed the diff fluid and put in half heavy / half normal redline and added 1 bottle of GM slip additive. Nothing changed with the wub-wub so I'm assuming it was not the diff. It really sounds like it is coming more from the corner, anyway.

    Only mods I have back there are the BMR girdle, crossbrace, and cradle mounts from their anti-wheelhop kit and Hotckiss rear bar. I do get a rattle over minor bumps in the back but I was going to disconnect the sway to see if it was end links before ordering new ones.

    I was thinking maybe the bushings in the toe arm or lower control arm could be loading/unloading as well?

    Thanks for any suggestions,

    PJ

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  3. #2
    rand49er's Avatar
    rand49er is offline Cadillac Owners 10000+ Posts
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    CV joint?
    '05 CTS-V, Maggie, Kooks, Hotchkis, Ground Control, Corsa, B&M, DSS/Hendrix, Full 3M Clear Bra, Autovation, V Headrests, CTS Console, STS-V 55w Fogs, Black Vette FRCs, Specter Werkes, Katech LS9 Clutch, SS Brake Lines, Heavymetals U-Turn Fuel Line Eliminator, Momo Combat Evo Shift Knob, Wldwhl Clear Sidemarkers, Linea Corse LC855 Wheels or OEM wheels w/'06-'07 Center Caps, plus a couple more. 472 RWHP/411 RWTQ (Mustang Dyno).

  4. #3
    mackey is offline Cadillac Owners Fanatic
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    someone playing dubstep next to you? :P

  5. #4
    barrok69's Avatar
    barrok69 is offline Cadillac Owners Fanatic
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    It could be one of the three things listed below:

    1- Wheel Bearing needs replacing
    2- rear half-shaft CV Joint needs replacing
    3- Posi rear end needs Diff fluid replaced (or too much slip additive put in)

    You can feel for slop in the wheel bearings pretty easy. It isn't uncommon to hit a large pothole and damage a wheel bearing.

  6. #5
    odla's Avatar
    odla is offline Cadillac Owners Connoisseur
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    How can you feel for slop in the wheel bearing? Also How can you tell which wheel? Mine sounds the same but i cant tell which rear wheel.
    Thanks

  7. #6
    69stangscj's Avatar
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    Quote Originally Posted by barrok69 View Post
    It could be one of the three things listed below:

    1- Wheel Bearing needs replacing
    2- rear half-shaft CV Joint needs replacing
    3- Posi rear end needs Diff fluid replaced (or too much slip additive put in)

    You can feel for slop in the wheel bearings pretty easy. It isn't uncommon to hit a large pothole and damage a wheel bearing.
    How much slip additive does it call for?

  8. #7
    barrok69's Avatar
    barrok69 is offline Cadillac Owners Fanatic
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    Quote Originally Posted by odla View Post
    How can you feel for slop in the wheel bearing? Also How can you tell which wheel? Mine sounds the same but i cant tell which rear wheel.
    Thanks
    You can check with the vehicle in the air or on jacks by rotating the wheel assembly side to side and up/down fashion. If there is any movement your bearing is shot. It's also same type of check for balljoints.

    Another easy way is with the wheel up in the air, spin the wheel and put a long screwdriver blade on the hub body area and the end of the screw driver to your ear. You'll be able to hear any kind of grainyness and feel roughness in the rotation.

    Identifying which side is usually an exercise inside the vehicle while driving with a passenger listening for differences in intensity from from left side vs right side, and then verifying with the screwdriver test.

    Quote Originally Posted by 69stangscj View Post
    How much slip additive does it call for?
    I believe it calls for a maximum of 4ounces. I put amsoil severe gear in my diff and it doesn't require any additive and I don't have any type of groaning coming from the rear.

  9. #8
    odla's Avatar
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    Thanks for the info.

  10. #9
    Fore V is offline Cadillac Owners Member
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    That was pretty much the sound that my car was making. Plus vibration and groaning. Just replaced my rear with Timken’. This is the second time around. The first time I bought the cheap china ebay stuff .... never again ... they did not last. The first time I had my mechanic do it. I decided to DIY with the Timken HA580082 from Rock Auto (Good deal!) The job wasn't bad to do until the second one .... it would not slip on the axle. There was a manufacturing defect. Do yourself a favor: dry-fit them first before installing it on the knuckle. I had to grind down the bearing grooves inside dia 3/8” from the edge as it was to small (or tapered) ! Anyhow, all done and happy.
    Cheers

  11. #10
    trhs75 is offline Cadillac Owners Fanatic
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    Re: "Wub-Wub" sound on tight turns from rear driver side...

    Are you positive it's from the rear? Mine was making noise turning in one direction, and it turns out there was a loose inner front fender molding or something causing the noise by rubbing on the tire. I felt so silly. Just thought I'd offer it as a possibility!

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