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Suspension, Brakes and Tires Discussion, Shake Shimmy STS in Item Specific Cadillac Discussion; Are you guys removing all 6 cradle bolts? I had to replace my steering rack a couple of weeks ago, ...
  1. #121
    agood1 is offline Cadillac Owners Member
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    Re: Shake Shimmy STS

    Are you guys removing all 6 cradle bolts? I had to replace my steering rack a couple of weeks ago, and I had to remove all 6 cradle bolts. I had the car on a lift and both sides of the cradle supported, but it came down at least 4 inches. That should be enough to get the mounts out......but you will have to remove, or at least loosen all 6 bolts. I tried just the back 4 bolts and it did not move enough for me to get to the rack mounting bolts.

  2. #122
    Dadillac's Avatar
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    Re: Shake Shimmy STS

    I had all three driver side bolts out, and the passenger side bolts loose. I jacked up the car, put a jack stand under the driver side, removed the tire, and the cradle only lowered a little.

    I came up with a solution though. I just ordered the lower mount plates today. I am going to enlarge the hole of one plate, so that the upper mount sleeve will not contact it, and install another plate over it. It should give at least 1/4 - 1/2 inch additional clearance. So the plates will squish the rubber with more force. I do not see why this would not work, so I am going to try it. The worst that can happen, is I am out another $21.00, and a few hours of my time. I will post with the results when it is done.

    Don

  3. #123
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    Re: Shake Shimmy STS

    Quote Originally Posted by Logandiagnostic
    I also have not found the room to remove the upper mount plate.

    I am begining to think the you remove the mount bolts on 1 side....and loosen the mount bolts on the other side. Maybe that will provide enough room...

    I also cannot figure out how the lower rubber comes off the cradle....



    Logan Diagnostic
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    Working in the driveway, the spacer that goes through it has to come out first. Soak the mounts metal collar with penetrating oil where it sticks through the frame. After it sits a bit, place something thick between the mount and the car body and jack the frame up to push the mount out. When I get a real stubborn one, I hack off the part sticking through the frame and pry the rest of it out.

  4. #124
    Logandiagnostic's Avatar
    Logandiagnostic is offline Cadillac Owners Connoisseur
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    Exclamation Re: Shake Shimmy STS

    Thank you...exactly the info I needed.....I knew you would know....

    Not our line of work..



    LoganDiagnostic
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  5. #125
    Logandiagnostic's Avatar
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    Re: Shake Shimmy STS

    Found a image of the 2005 DTS dogbone....huge part....

    It appears it mounts to the front cylinder head then mounts rearward on the frame rail.


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  6. #126
    El Dobro's Avatar
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    Re: Shake Shimmy STS

    It also looks like the rear trans mount was eliminated.

    I was screwing around under the hood of my '98 SLS and I had the parking brake off, with the car in park. I pushed up against the car and then let it roll back. When I saw the engine move, I rocked the car back and forth a few times. It was very interesting to see how much the engine moves around when you do that.
    centaur and centaur like this.

  7. #127
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    Re: Shake Shimmy STS

    Okay, the lower mount plates that I ordered, showed up yesterday. I immediately took them to the basement, and began work. The center hole is approximately 9/16". I bored out 6 plates, to about 1". I used a 3/4 step drill bit, and finished up with a Roto Zip with a grinding wheel. I installed them this evening (removed old plate and bolt, installed new bored plate on top of old plate, so not iw is double plated), and will update you tomorrow. So far, I can tell that the rubber bushings now have more stress on them. I put about 8 miles on the car after the install, but never got over 45 mph. It may be a placebo effect, but the car does feel a little more solid now. Anyway, I will know if this had any effect, good or bad, at about 6:45 am.

    Don

  8. #128
    zanyzeuss is offline Cadillac Owners Member
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    Re: Shake Shimmy STS

    have any of you had your hub assemblies aka "wheel bearings" replaced? I had a shimmy problem on my 94 eldo at 60-80 or so, i had one of them replaced and the problem vanished, same thing on my 97 regal. My 96 just started shimminin at 65-80 before and after new tires and rims off 06 sts. I recently got back to my pothole ridden hometown in wisconsin after being in arizona for a year with the 96 and after hitting a few potholes i believe one of my hub assemblies went again

  9. #129
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    Re: Shake Shimmy STS

    Well, doing my little mod didn't help. The shimmying is still the same. The car does feel tighter though. Seems to wander less also. So it wasn't a complete waste. Next step, looking at the rear of the car. Last April, my car was rear ended. The bumper cover was damaged, and there are three clips that hold the center section up to the body, that had broken off. That caused the bumper cover to hang down a bit, in the center of the car. While driving it home from the accident scene, the car had the same vibration, only it was worse. So that is the next area I am going to look at. I am beginning to think that the rear bumper cover is working almost like a parachute, and causing the vibration. I'll let all know what happens.

    Don

  10. #130
    Tombo47 is offline Cadillac Owners Enthusiast
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    Re: Shake Shimmy STS

    STS the only cars lagued with this? My DTS ahs the shakes at 66-74 but its msot likely unequal pressure or tire wear

  11. #131
    JimD is offline Cadillac Owners Connoisseur
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    Re: Shake Shimmy STS

    Dadillac or Logan or anyone else actively thinking about the original problem on '98+ Sevilles and 2000 - 2005 Devilles...

    Any chance someone could fabricate a strut tower brace as a test????

  12. #132
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    Re: Shake Shimmy STS

    Quote Originally Posted by JimD
    Dadillac or Logan or anyone else actively thinking about the original problem on '98+ Sevilles and 2000 - 2005 Devilles...

    Any chance someone could fabricate a strut tower brace as a test????
    I am actually considering it. But if I do this, it will not be until the summer, at earliest. In the meantime, I started hunting for aerodynamic issues. I am starting in the front of the car, and working backward. So far, to eliminate hood vibration, I adjusted the plastic adjusters upward. No change. Also, I removed the front hood seal (as it is kind of scoop shaped), and no change. I will be reinstalling that. I will continue to search. Although I will not rule out mechanical issues, I am opinionated that the real problem is aero.

    Don

  13. #133
    JimD is offline Cadillac Owners Connoisseur
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    Re: Shake Shimmy STS

    Both my vehicles are shake and shimmy free at all speeds. Otherwise I would test it myself.

  14. #134
    zanyzeuss is offline Cadillac Owners Member
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    Re: Shake Shimmy STS

    Quote Originally Posted by Dadillac
    I am actually considering it. But if I do this, it will not be until the summer, at earliest. In the meantime, I started hunting for aerodynamic issues. I am starting in the front of the car, and working backward. So far, to eliminate hood vibration, I adjusted the plastic adjusters upward. No change. Also, I removed the front hood seal (as it is kind of scoop shaped), and no change. I will be reinstalling that. I will continue to search. Although I will not rule out mechanical issues, I am opinionated that the real problem is aero.

    Don
    your problem could be aero as i believe you said earlier that you had been rear ended, but i believe most everone elses problem has to be mechanical, as the car would have shimmied from the factory assuming nothing major has been done to the aerodynamics of the car
    Also i would like to hear from anyone else that has replaced their hub assemblies "wheel bearings" as it did wonders for the shimmying on my cad and buick

  15. #135
    tstach is offline Cadillac Owners Fanatic
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    Re: Shake Shimmy STS

    There has been a commendable effort here to resolve this problem that has been quite informative and completely logical, which may be the main cause of these vibration issues, but I am going to throw another curve in here.

    Just last Friday, I did my rear brakes. I bought brand new EBC sport rotors and AC Delco Dura Stop pads. (which now match what I have on the front brakes.) I do not feel any of the vibrations I had in the 70-78MPH range anymore.

    It is possible that this vibration could return after my next tire rotation.

    It is also possible that my cradle bushings are not to the point yet to where they are loose enough to cause vibration.

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