hard shifting

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Northstar Engines and System Technical Discussion Discussion, hard shifting in Cadillac Engine Discussion; I have a 2003 deville with the northstar it has 172000 miles on it. Rides good but as its shifting ...
  1. #1
    kcgemini is offline Cadillac Owners Member
    Join Date
    Sep 2012

    hard shifting

    I have a 2003 deville with the northstar it has 172000 miles on it. Rides good but as its shifting from 2nd to 3rd its a hard shift unless u really lay into the gas. Would it b ok to change transmission fluid I've been told that once you have so many miles on a tranny u shouldn't change fluid. Any suggestions

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: hard shifting

    A trans fluid change can't hurt, but probably will not help either.

  4. #3
    rodnok01's Avatar
    rodnok01 is offline Cadillac Owners Master
    Automobile(s): 98 DeVille, 97 DeVille d'Elegance
    Join Date
    Feb 2012

    Re: hard shifting

    Older trans would develop leaks when you waited too long to change the fluid and would act up ocassionally. We had a policy that no more than 100k would a trans get it's first change or we didn't touch it(back in the 80's and 90's). With the newer trans and better fluid I haven't seen any real issues. If the fluid looks and smells good I would change it without a second thought. But as Ranger has said it prob won't help either. Sounds like a sticky valve to me.

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  6. #4
    stoveguyy is offline Cadillac Owners Connoisseur
    Automobile(s): 03 STS
    Join Date
    Aug 2007
    mpls mn

    Re: hard shifting

    The lower valve body where the 2 shifts solenoids are located is very simple. The solenoids are almost identical and the plungers are also similar. I would be more inclined to think the pressure control solenoid is the issue. But that is under side cover and is a bear to change. A worn o-ring or leaky seal in any number of places could cause a rough shift.

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