2100-2350RPM Vibration fix is eluding me - Page 4
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2004-2007 Cadillac CTS-V General Discussion Discussion, 2100-2350RPM Vibration fix is eluding me in Cadillac CTS-V Series Forum - 2004 - 2007; I'm now chasing a vibration in 5th gear that kicks in about 50 mph and is there part-throttle up to ...
  1. #46
    AG'S-V's Avatar
    AG'S-V is offline Cadillac Owners Enthusiast
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    Re: 2100-2350RPM Vibration fix is eluding me

    I'm now chasing a vibration in 5th gear that kicks in about 50 mph and is there part-throttle up to about 80.

    I think at some point the drive shaft wasn't indexed right...carrier bearing looks/feels fine.

    >.<

  2. #47
    67electro is offline Cadillac Owners Member
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    Re: 2100-2350RPM Vibration fix is eluding me

    if its only in 5th gear, I doubt its the drive shaft... the drive shaft wouldn't care what gear you are in..

    what could care, would be the output shaft of the transmission, or the counter shaft for 5/6

    if there is an issue with the shaft bearings, then it would cause an issue depending on what gear you are in, because the different gears put load on the shaft in a different place.

    a few inches apart does make a different if its a rotational vibration... think of it as being out of balance, if the shaft is allowed to wobble in its bearing races.

    its my opinion that is is more likely transmission related.

    Here is a picture of the fixed 5-6 Gear being removed directly from the tail/main shaft.
    Tranny20Rebuild20using20gear20puller.jpg

    Here is a picture of the counter shaft that selects between the 5th and 6th gears using the shift forks, etc.
    Tranny20Rebuild205th206th20gear20remove.jpg

    these pictures are from this post about rebuilding:
    http://www.ls2.com/forums/showthread.php?t=1877

  3. #48
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    Re: 2100-2350RPM Vibration fix is eluding me

    Yeah, that's what I'm afraid of...what's a tranny rebuild running these days for a T56?

  4. #49
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    Quote Originally Posted by 67electro View Post
    lol, Dougnuts, and Cadzilla, how are things going with this?

    I have my Ls7 kit, I need to order the bleeder still.

    I can only find one place here in phoenix that will balance the assembly, and that's Chuck Speed and Rv center. they want 80 bucks.
    No progress, I parked the car. Looks great sitting still. Some days I just sit in it and pretend it's 2008 and I'm driving with no vibrations......ahhh yes....smooth...

  5. #50
    DougNuts is offline Cadillac Owners Fanatic
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    Re: 2100-2350RPM Vibration fix is eluding me

    No change on my end, yet. After poking around on this site the other day, I decided to buy a new transmission mount from Creative Steel to see if that does anything. It arrived yesterday (quick!) and I may try to put it on tonight if I have a chance.

  6. #51
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    Looking forward to that feedback as I plan to do the same. I'm not expecting it to be resolved but hopefully it will be lessened simply because there'll be less strain on the drivetrain..

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    Re: 2100-2350RPM Vibration fix is eluding me

    I have good news to report! The Creative Steel transmission mount made the car much, much better. The vibration isn't completely gone, but I'd give it a 90% reduction in harshness! Almost as good is how much the shifting has improved with the new trans mount. I need to get some more time behind the wheel to be sure, but so far I'm happy with the car again.

  8. #53
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    Quote Originally Posted by DougNuts View Post
    I have good news to report! The Creative Steel transmission mount made the car much, much better. The vibration isn't completely gone, but I'd give it a 90% reduction in harshness! Almost as good is how much the shifting has improved with the new trans mount. I need to get some more time behind the wheel to be sure, but so far I'm happy with the car again.
    That's music to my ears. The first mod I did with my V was new motor mounts in an effort to get rid of engine vibes around the same rpm as you describe (but in all/any gear). Unfortunately the new mm's didn't do much for the vibes and I've just lived with it for the past year. At the time I got the mm's I also got the trans mount, but most people said it wouldn't help anything so its just been sitting on a shelf collecting dust. This is definitely motivation to install that thing!!

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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by WesH8398 View Post
    That's music to my ears. The first mod I did with my V was new motor mounts in an effort to get rid of engine vibes around the same rpm as you describe (but in all/any gear). Unfortunately the new mm's didn't do much for the vibes and I've just lived with it for the past year. At the time I got the mm's I also got the trans mount, but most people said it wouldn't help anything so its just been sitting on a shelf collecting dust. This is definitely motivation to install that thing!!
    Yes, throw it in there, it only took about 45 minutes to install. After driving the car for a few days, I can say that the vibration is not fixed, but it is reduced with the new transmission mount.

  10. #55
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    Since it sounds like you installed it yourself, can you tell me if it was necessary to remove the exhaust in order to get the mount out/in? Or were you able to do it with the pipes in place?

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    Re: 2100-2350RPM Vibration fix is eluding me

    Quote Originally Posted by WesH8398 View Post
    Since it sounds like you installed it yourself, can you tell me if it was necessary to remove the exhaust in order to get the mount out/in? Or were you able to do it with the pipes in place?
    You need to drop the front of the exhaust (4 bolts), but that's it. Caution: They may be rusted.

  12. #57
    67electro is offline Cadillac Owners Member
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    Re: 2100-2350RPM Vibration fix is eluding me

    yeah, mine were rusted.. and one broke. they were easy to remove with a good wrench and socket, but like I said, one broke. took a trip to ace hardware and got a stainless bolt to replace the broken stud, just threaded it in through the back. and it worked fine.

  13. #58
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    Quote Originally Posted by 67electro View Post
    yeah, mine were rusted.. and one broke. they were easy to remove with a good wrench and socket, but like I said, one broke. took a trip to ace hardware and got a stainless bolt to replace the broken stud, just threaded it in through the back. and it worked fine.
    Lucky it broke where you still had a decent amount of threads left to use!

    I think I'll be soaking the crap out of those suckers with penetrating oil before I go at em. Soak, heat (drive), allow to cool, soak, repeat. lol I wonder if using an impact on them would be better or worse in terms of breaking bolts...

  14. #59
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    Re: 2100-2350RPM Vibration fix is eluding me

    I would not use an impact... if you are worried about breaking it, use a regular 3/8 drive ratchet, that way its harder to break it. and do use the penetrating oil.

    many people see a rusty bolt and they go at it with an impact, or 1/2 drive, or breaker bar.. and that's great and all... but not if you snap the bolt.

  15. #60
    67electro is offline Cadillac Owners Member
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    Re: 2100-2350RPM Vibration fix is eluding me

    no swatting flies with atom bombs

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