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Thread: Transmission Oil Change? Yes or No

  1. #1
    Member Shayenne's Avatar
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    Default Transmission Oil Change? Yes or No

    So my newest member of my panther collection has some slipping transmission issues....
    The day I brought the car home, the transmission line broke. I noticed right away and pulled over, we fixed it then and there (it was fixed before and that fix broke), filled up the fluid and continued.
    I emailed the previous owner regarding this and he told me, it broke on him as well and he also noticed right away and fixed it. The car was not driven without transmission fluid. However the fluid that came out that day was brown. I am hearing different opinions on changing the filter and transmission fluid. Some say, DON'T do it you will f.... up your transmission! Apparently whatever is in the old fluid is needed in there and others say Go for it. The car only has 114000 km on it, original engine and transmission.

    What is your opinion on changing transmission fluids?
    1995 Lincoln Town Car Executive Series: "Albert" my daily driver
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  2. #2
    Lost and driftin' Arquemann's Avatar
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    Just change the trans fluid.
    New fluid will always be better than whatever old crap is in there, as long as it's the correct fluid for the application.

    Lifetime trans fluids are bullshit and so is someone telling to not change your trans fluid.
    1985 Mercury Grand Marquis LS, "Maisa"
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  3. #3
    GMN Regular DerekTheGreat's Avatar
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    Change it and the filter. If it breaks, it was going to anyway.
    1985 LTD Crown Victoria - SOLD
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  4. #4
    I'm an air-conditioned gypsy gadget73's Avatar
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    ^^ thats my theory on it. Never subscribed to the idea of running bad fluid to keep a transmission alive. I've changed several that were obviously way past due and had no issues with it. I think that "I changed the fluid and it died" thing comes from people who have a transmission thats got some major problem going on, they changed the fluid expecting a miracle, then it went ahead and failed like it was going to do anyway.

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    Quote Originally Posted by phayzer5 View Post
    I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

  5. #5
    Road Warrior Kodachrome Wolf's Avatar
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    I've done fluid and filter on a handful of these cars, several of which were definitely a little "past due". Last one was a '99 CV that had a torque converter shudder and what I got out was nasty brown ATF. Car had roughly 200K on it. Gave it fresh Mercon V and it delivered appropriately firm shifts and no more shudder.

    As everyone else has said before, if you change it and it dies, it was already very much dead.

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  6. #6
    Beater gonna beat sly's Avatar
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    The clutches are probably worn out. The torque converter as well (if AODE/4R7x). New fluid may help, but yeah... if it craps itself shortly, it was because the clutches were worn out. If this is an AOD, tighten up the TV cable just a little and might need to look into a shift kit. If it's an AODE/4R7x, look into a j-mod.

    I know this is in the box section, but the actual car wasn't mentioned. Signature lists an aero and a box, so I'm covering all bases.

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  7. #7
    Member tbear853's Avatar
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    change it
    No ... I'm not arguing with you ... I'm just explaining why I'm right ...

    Now go ... and whatever you do ... have a safe trip!

  8. #8
    GMN Regular DerekTheGreat's Avatar
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    Quote Originally Posted by Kodachrome Wolf View Post
    I've done fluid and filter on a handful of these cars, several of which were definitely a little "past due". Last one was a '99 CV that had a torque converter shudder and what I got out was nasty brown ATF. Car had roughly 200K on it. Gave it fresh Mercon V and it delivered appropriately firm shifts and no more shudder.

    As everyone else has said before, if you change it and it dies, it was already very much dead.
    Yah, every car I've ever changed it only resulted in improvements. There was one outlier- a 1991 Mark VII. Trans shifted like ass going from 3rd to 4th anyway and unfortunately I never adjusted the TV linkage. Fluid & filter were changed- that car lost OD some three or four months later. I do not blame the fluid change- I instead point to the hard shifting. That was also an experiment- everyone says you should have more TV pressure than less and that you want a firmer shift.. but I don't subscribe to that. If the internals are stock- set it up to shift stock, least with an AOD. I've put well over 40k on the on in my '88 with zero issues.
    1985 LTD Crown Victoria - SOLD
    1988 Town Car Signature - Current Party Barge

  9. #9
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    You said its already slipping. So what will it hurt to change it? Sounds like its already cooked.
    1987 CV LX 5.0

  10. #10
    fomoco panthers !
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    Change the fluid and filter now and start saving for a rebuild now. Maybe you can save enough before the trans quits.
    Just don't go to one of those transmission fluid FLUSH places.

  11. #11
    351W & F.A.S.T equipped
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    A lot of the ďdonít change itĒ myth is based around the notion of the fresh detergents in the new fluid washing sediment and debris from one part of the valve body to another, where it may collect and cause other issues. Thatís about as true as having bad luck from breaking a mirror.

    Iíve pulled valve bodies that have had multiple fluid changes/flushes that still had build-up in the valve body. Years ago, I bought a fox-t-bird that had 178k miles of hateful neglect at the hands of a Chevy lover. The trans fluid was BLACK and right before swapping to a T5, I decided to do a 20qt flush with a machine at work. I didnít realize how bad the trans shifted and generally behaved until I flushed it. It was like new afterward and I was even able to get a few bucks for it!

  12. #12
    I post a lot...
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    I really find it refreshing that we have a bunch of people here that think logically. At least some of the time
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  13. #13
    Donating Member massacre's Avatar
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    I have heard of this over the years, but never practiced it myself.
    This story is right up there with "pack the pan full of sawdust".
    Which does work but that's a last ditch effort
    ..

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