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Thread: Is gear position "3" DRIVE on my Deville?

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    VEGASELDO91 is offline Cadillac Owners Fanatic
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    Is gear position "3" DRIVE on my Deville?

    I know the D with the O is overdrive. Is it safe on the transmission to stay in "3" for city commuting, I was told it's just like D. Also I noticed my 91 Eldo seemed to pick up a lot more grunt when I went from D/O to "3", than the Deville seems to. Is this mainly due to the weight difference or does the traction control play a part? The "TRACTION DISABLED" message sometimes displays and other times it seems to work o.k. . If "TRACTION DISABLED" is displayed it means the full power is getting to the wheels; correct?


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    basscatt's Avatar
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    Re: Is gear position "3" DRIVE on my Deville?

    if you drive around in 3 -
    you car will not shift into 4th - or Overdrive -

    same way if you drive around in 2 -
    it will never upshift into 3 or 4th -

    about the only time that might be the least bit helpful -
    assuming we are talking about a 95 Deville - with a 4.9 motor -
    would be towing a somewhat heavy trailer up a long - slight incline -
    at highway speeds - or into a strong headwind - again at highway speeds -

    this would only prevent the trans from constantly shifting
    from 3rd to 4th - then back down to 3rd - then up to 4th -
    as slight changes in road conditions - headwinds - speed - etc might require -

    other than that - I can see NO reason to drive around in 3rd -

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    MoistCabbage's Avatar
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    Quote Originally Posted by VEGASELDO91
    The "TRACTION DISABLED" message sometimes displays and other times it seems to work o.k. . If "TRACTION DISABLED" is displayed it means the full power is getting to the wheels; correct?
    No. Traction control only steps in if wheel spin is detected. When traction control is disabled, the transmission starts off in second gear.

    Have you pulled your codes?

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    Ranger's Avatar
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    Re: Is gear position "3" DRIVE on my Deville?

    Is it safe on the transmission to stay in "3" for city commuting
    Yes. You'll just turn a slightly higher RPM and burn a little more gas.

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    VEGASELDO91 is offline Cadillac Owners Fanatic
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    Re: Is gear position "3" DRIVE on my Deville?

    I did pull them a while back, but will need to pull them again. I will report back...

    ----------

    Okay I pulled the codes. T067 H. Brake light switch fault (TCS equipped vehicles only)
    T072 C. Serial data link fault
    T077 C. There is no listing for this code in the sticky, but a Google search states:T077 means that the PZM computer has lost it's communication link with the PCM computer.

    I also found P055 current:Closed Throttle Angle Out of Range

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    Re: Is gear position "3" DRIVE on my Deville?

    but none of this has anything to do with driving around in 3rd gear -

    why would you want to do this?

    what do you think the advantage would be?

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    VEGASELDO91 is offline Cadillac Owners Fanatic
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    I don't want to necessarily drive around in 3rd gear, I'm mainly trying to understand why I felt an obvious change in my Eldo. but not in the Deville. Also I was unaware that the transmission started in second with the TC disabled. The Eldo. seemed to take off a lot stronger than the Deville in 3rd gear. I posted my code finding because it was asked if I had pulled them.

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    Putting the stick in 3 has absolutely no effect on acceleration. All it does is keep the transmission from shifting into 4th at speed.

    ----------

    I would start by checking/cleaning the EBTCM connector.

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    VEGASELDO91 is offline Cadillac Owners Fanatic
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    Okay I hear you. What I know is when I would take off hard from a dead stop in the Eldo while in 3rd it definitely had a stronger acceleration than when in D. Just like the Nissans I drive everyday, if I turn the O/D button off the vehicle gets up and moves more quickly from a stand still.

    ----------

    Okay I will have to search what/where that is. Is this in relation to my TC codes? It was suggested that one or more of my wheel speed sensors may be bad; is this a possibility with these codes?

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    Placebo effect. The "3" position is simply an overdrive lockout, just like the O/D on/off buttons. Nothing at all to do with power output of the engine, or the shift points of 1-3.

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    VEGASELDO91 is offline Cadillac Owners Fanatic
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    Thanks I understand; like staying in 3 in a manual transmission vehicle. You still have to shift 1 2 3 but you can control when you shift. The Deville will shift up to 3rd gear but will not shift into 4 (O/D) due to the shifter being in the "3" position. The A/T downshifts for me!

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    Re: Is gear position "3" DRIVE on my Deville?

    Quote Originally Posted by VEGASELDO91 View Post
    Thanks I understand; like staying in 3 in a manual transmission vehicle. You still have to shift 1 2 3 but you can control when you shift. The Deville will shift up to 3rd gear but will not shift into 4 (O/D) due to the shifter being in the "3" position. The A/T downshifts for me!
    -----------------------------------
    The Deville will shift up to 3rd gear but will not shift into 4 (O/D)
    due to the shifter being in the "3" position

    EXACTLY -
    and sorry to disappoint you -
    the same holds true with the Nissans -
    the OD button simply prevents the trans from shifting up into OD -
    has nothing to do with starting in 1st gear -

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    Slipgate is offline Cadillac Owners Enthusiast
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    Re: Is gear position "3" DRIVE on my Deville?

    The reason they separate out overdrive and/or have a button is that your torque converter needs to electrically lock instead of slipping like it normally does in non-over-driven gears. When in overdrive, your transmission spins faster then your engine so the connection between the engine and the trans must be constant. It won't hurt your trans or engine to run in 3rd all the time but you gas mileage will suffer.

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    Re: Is gear position "3" DRIVE on my Deville?

    Overdrive & lockup are 2 different things. The trans is capable of lockup in 3rd gear when the PCM calls for it.
    When the traction is disabled, you may have 2nd gear starts.
    Put the car in OD and let the PCM do its job.


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