1991 Dynasty - Various Questions

Discussion in 'General Motoring' started by C. Bailey, Apr 18, 2006.

  1. C. Bailey

    C. Bailey Guest

    I just bought a new vehicle, and now I need to decide if I am going to keep
    the 91' Dynasty as my commute vehicle or if I am going to get rid of it.

    The Dynasty has transmission issues, but beyond that, it runs well. It has
    120,000 miles on it. I am debating spending money to fix the transmission,
    but I am not certain how many trouble free miles I can expect out of the
    Dynasty on a go-forward basis?

    The automatic transmission upshifts and downshifts rough between 1st and
    2nd, and 2nd and 3rd gear. It works fairly well in the morning when it is
    cold, but the shifts get rougher as it warms up. I recently had the
    transmission oil and filter changed - the mechanic indicated there were no
    metal filings to speak of. It shifted almost perfectly for a couple days
    after the oil change, and then it got worse than it ever was. Fortunately,
    it has improved slightly in recent weeks, but there is little doubt there is
    a problem. Based on this vague information, can anyone suggest to me what
    the nature of the problem might be, and the possible range of costs involved
    to fix it?

    Thank you,
    C. Bailey, Apr 18, 2006
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  2. C. Bailey

    hartless Guest

    If it shifted fine, and got worse after the servicing I would suspect that
    there is the wrong tranny fluid in it. I would have them drain and refill
    with the correct fluid, ATF+3.
    hartless, Apr 18, 2006
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  3. C. Bailey

    C. Bailey Guest

    Thank you,

    It was shifting terrible before the fluid change - after reading all the
    newsgroups, I thought it was worth a shot, but in my case, it only solved
    the problem for a couple days. It makes me wonder if there isn't something
    "loose" in the transmission clogging some of the ports, and the fluid change
    was enough to dislodge it temporarily....

    Any thoughts on what it could cost to get them to do a tear down and an

    C. Bailey, Apr 19, 2006
  4. C. Bailey

    Dave Gower Guest

    Sounds like dirt to me. If this is a three-speed, as I recall the valve body
    needs to be removed and cleaned. The fluid change might have stirred things
    Dave Gower, Apr 19, 2006
  5. C. Bailey

    C. Bailey Guest

    Thank you,

    It is a 4 speed. The shift from 3rd to 4th has always been fairly smooth,
    so I didn't mention that earlier.

    C. Bailey, Apr 19, 2006
  6. C. Bailey

    Steve Guest

    Well, if you got 120k out of the first transmission, you'll get about
    that much out of the next (more if the rebuilder upgrades it with newer
    parts). The engine should last over 200k pretty easy.. The plastic
    interior bits and pieces will start to fail on these cars before
    anything major mechanical (other than the trans).
    Steve, Apr 20, 2006
  7. C. Bailey

    Steve Guest

    Not likely- but again you should be SURE that it has the correct fluid
    in it (and I'd recommend ATF+4 over ATF+3) before tearing into it.
    There's nothing to "adjust" in the electronic 4-speeds. All "adjustment"
    is done when the clearances in the clutch packs are set during assembly,
    then the computer takes it from there and compensates as parts wear. A
    "turnkey" rebuild runs in the neighborhood of $1000-$1500. Less if you
    R&R it yourself.
    Steve, Apr 20, 2006
  8. C. Bailey

    Steve Guest

    I also forgot to mention that any transmission shop should hook this
    unit up to their diagnostic scan tool. They can then read the clutch
    volume indices from the computer and get a very accurate estimate of how
    worn the clutch packs are. It won't identify hard failures like broken
    snap-rings, and it won't identify incorrect fluid, but it will give an
    indication of the overall health of the friction materials.
    Steve, Apr 20, 2006
  9. C. Bailey

    C. Bailey Guest

    With regards to transmission work, am I better off going to a dealer, or to
    a transmission shop?

    I had the transmission oil changed at a dealership - would they put anything
    but ATF3 or ATF4 in the car? I did insist to the guy making up the ticket
    that they use ATF3, but I didn't see what they actually put in the car.....

    C. Bailey, Apr 22, 2006
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