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Technical 1961 Cadillac Hydramatic transmission pops out of park very easily.

Discussion in 'The Hokey Ass Message Board' started by nikwho, Sep 15, 2023.

  1. nikwho
    Joined: Mar 20, 2010
    Posts: 63

    nikwho
    Member

    Hey fellas,
    I just picked up a pretty complete and clean 1961 Cadillac Sedan Deville. It runs quite well, and the transmission seems to be pretty happy. However, if you just nudge/bump the shifter down while the transmission is in park, it pops out of park and into drive. I haven't had any issues with it, but curious if this is perhaps as simple as a shifter linkage adjustment? It seems as though it could be. I'm just going through the car, replacing some rubber fuel and brake lines, and doing some service, to make her a good driver.

    Thoughts? Any preventative maintenance (transmission, or otherwise) outside of standard stuff that I should be putting on my list? I'm new to these Cadillacs. It's all stock, 390/Hydramatic.

    20230910_113831.jpg 20230910_095930.jpg
     
    TrialByError likes this.
  2. Black Panther
    Joined: Jan 6, 2010
    Posts: 2,351

    Black Panther
    Member
    from SoCal

    I'm sure it's the linkage....62 years of the body mounts compressing and just use will make things get wacky over time.
     
    nikwho likes this.
  3. 302GMC
    Joined: Dec 15, 2005
    Posts: 8,411

    302GMC
    Member
    from Idaho

    Clean up the shift detents down at the base of the mast jacket & check for broken or oil soaked engine or trans mounts.
     
    nikwho likes this.
  4. jimmy six
    Joined: Mar 21, 2006
    Posts: 16,774

    jimmy six
    ALLIANCE MEMBER

    The previous owners “may” never have pulled the shift lever towards the steering wheel much and moved the lever into reverse or drive rounding off the lever notch under the turn signal switch on the column.

    After removing the steering wheels you can carefully detach the signal apparatus and see the shifter arm notches. I had to file one once to keep A car in park.

    The are also grommets on the linkage rods that may be soft and need changing. Good luck. Nice Cadillac.
     
    Last edited: Sep 16, 2023
    TrialByError, nikwho and MAD MIKE like this.
  5. nikwho
    Joined: Mar 20, 2010
    Posts: 63

    nikwho
    Member

    Very interesting! You definitely don't need to pull the shifter towards the wheel to get it out of park!

    Okay, I've got a pretty solid list of stuff to check:
    - Shifter linkage rod grommets
    - Shifter arm notches (under wheel and turn signals apparatus)
    - Clean up shift detents at the base of the mast jacket
    - Check for broken/oil soaked engine or trans mounts
    - Shifter linkage

    I THOUGHT that I was getting off shift this morning, and intended on trying to get this all squared away today. However, staffing shortages at work and others not wanting to show up on the weekend prevented me from going home! Hopefully someone shows up tomorrow, and I can check this stuff out.
     
    jimmy six and 302GMC like this.
  6. jimmy six
    Joined: Mar 21, 2006
    Posts: 16,774

    jimmy six
    ALLIANCE MEMBER

    What ever you do until you’ve fixed the problem….apply the parking brake EVERYTIME you park the car. Older Ford owners know this for sure..
     

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