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Thread: Transmission fluid change or flush?

  1. #1
    mhswres1 is offline Cadillac Owners Fanatic
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    Transmission fluid change or flush?

    As most of you know from me posting here the past few months that i bought a 99 cadillac deville that has been quite the problem child... proud to say that i am almost finally caught up with fixs and preventives that have never been done....


    Today in an hour or so im going to go get my transmission fluid changed.. my question is this. The fluids never had a change before.. so should i grt the flush treatment or just go for the pan drop drain and refill?

    I have read that flushes can ruin your car if they have not been kept up with... so im thinking ill go with the just normal pan drop ect. And advice on this would be appreciated.. thank u


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  3. #2
    kc8zmp is offline Cadillac Owners Member
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    Re: Transmission fluid change or flush?

    i have been wanting to do this on my 2000 deville fluid/filter change let everyone know any differences it makes

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Transmission fluid change or flush?

    In a healthy transmission a fluid change should make NO difference in anything. Transmission fluid has an incredibly long life (What does your transmission OLM indicate ?) so unless the fluid is burnt (heavy trailer towing, heavy mountain driving, racing), smells rancid or has been overheated (DIC message) there is no need to do a 'flush".

    The transmission is a dry sump unit so there should be NO FLUID on the stick with the engine off. Check level onkly with the drivetrain hot (> 10 mile drive), idling in P on a level surface.

    A dry transmission (complete overhaul) takes about 15 quarts of fluid, a full pan drop with side tank drain takes about 10 - 11 quarts and a simple pan drop takes about 5-6.

    GM changed to DEXRON-VI in 2006, a full synthetic fluid, and it is used for all transmission work and is fully compatible with the obsolete DEXRON-III.

    Most Oil Doodles simply drop the pan a little, drain off some fluid, and button it back up. Not the proper method at all.

  5. #4
    kc8zmp is offline Cadillac Owners Member
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    Re: Transmission fluid change or flush?

    Submariner409 how would u get all 15 quarts to drain so u could have all fresh fluid?

  6. #5
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Transmission fluid change or flush?

    A LOT of fluid remains in the torque converter and transmission pump/passages.

    Either make up a hose attachment for the top fluid cooler transmission line and use the idling engine to pump the transmission dry into a 5-gallon bucket or have a GM dealer do a complete fluid exchange using their pressure/vacuum machines..... This method (dealer) changes ALL the fluid and you have a GM service invoice in hand - about $140. Considering the cost of -VI it's a deal.

    Google "cadillac forums 4T80E transmission fluid change".

  7. #6
    mhswres1 is offline Cadillac Owners Fanatic
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    My fluid was brownish and smelled burnt.. got 7 qaurts out. My tranny fliud hadnt been done in 14 years and 160000 miles... it was time.. already noticed the shifting is a little better on the way home. Im going to do 3 drain and refills over my next oil changes... 2 simple drain/refill and the last a pan drop cleaning and new filter as this is safer then a transmission flush.

  8. #7
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Transmission fluid change or flush?

    No filter accessible with simple pan drop - filter gets changed at complete overhaul - side cover needs to come off. Screens in pan get cleaned.

    There was a diagram of the filter location in one of these forums three weeks ago .............

  9. #8
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Transmission fluid change or flush?

    Quote Originally Posted by mhswres1 View Post
    The fluids never had a change before.. so should i grt the flush treatment or just go for the pan drop drain and refill?

    I have read that flushes can ruin your car if they have not been kept up with... so im thinking ill go with the just normal pan drop ect. And advice on this would be appreciated.. thank u
    Go up to the Technical Archives at the upper left of the forum page (in the black bar) and read up on transmission flushing.

  10. #9
    mhswres1 is offline Cadillac Owners Fanatic
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    Ranger thank you my friend for that point out... quite an interesting and entertaining read


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