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Complete Trans Fluid Change

Discussion in 'Tech Info' started by Jason in DLH, Oct 19, 2020.

Car Parts
  1. Jason in DLH

    Jason in DLH Cheese Burger and Fries

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    This has probably been a topic of discussion time after time, but here is a good article from Popular Mechanics on how to do an ATF fluid replacement and how to remove ATF from “torque converter, clutch drums, valve body, and elsewhere” when you are replacing the ATF fluid.

    https://www.popularmechanics.com/cars/how-to/a105/1272521/
     
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  2. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    This is how many of us on the forum have done the transmission service on our trucks, myself included.

    The top line is the one you want to pull and hook a hose to and stick the other end in a bucket.

    I used clear hose so I could see when the color of the fluid changed so that I knew all the old fluid had been removed.

    I refilled with Wolf's head full synthetic Dexron VI.
     
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  3. Jason in DLH

    Jason in DLH Cheese Burger and Fries

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    What size I.D. clear hose do you use as that is a great idea!
     
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  4. kbuskill

    kbuskill ***CAUTION*** I do my own stunts!

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    I can't remember off the top of my head as it has been a while ago that I did it. I want to say 3/8".

    Maybe James @swathdiver will chime in.
     
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  5. swathdiver

    swathdiver Full Access Member

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  6. Jason in DLH

    Jason in DLH Cheese Burger and Fries

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    Great, thanks guys!
     
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  7. Bob2C

    Bob2C Full Access Member

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    What I found worked after I made a mess from the tubing coming out and pumping oil everywhere was get the adapter piece and hose. It snaps in just like the oil cooler line.

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    Sent from my iPhone using Tapatalk
     
    Last edited: Oct 20, 2020
  8. Woodblocker55

    Woodblocker55 Full Access Member

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    So how are you changing tranny fluid ? I was thinking suck fluid out before changing filter ?? I just changed lines I have 4 pipes from the ends .

    Sent from my LGL722DL using Tapatalk
     
  9. Bob2C

    Bob2C Full Access Member

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    So. I originally got the oil out of the pan by using the method of tapping the lower trans line (its the one that oil will be pumped out of) on the driver side for my 18 Tahoe. Start vehicle and let trans pump bring out oil until you see air bubbles. I then dropped the pan partially, changed the filter, magnet and wiped out pan. Then put about 8 quarts back in and begin to pump again until fluid was cherry red. I suspect I got about 10 or so of the 12 qts out that way. Then just topped off to bring up to fill mark. I did some towing over the summer and just wanted to do a quick fluid exchange without going through the hassle of disconnecting the line so I picked up a pump. It worked great. It got out about 5.25 qts. The only thing is that the suction line is not long enough so I picked up clear tubing at Lowe’s. 3/8 OD. Fit over pump tubing snug. Just make sure that the bought tubing is long enough to make your connection outside of the dipstick. I did the fluid exchange on a stone cold vehicle. I put back exactly what I took out. Easy transfer.

    One thing to note. The pump will need to be primed with oil before it will extract.
    Suck on line until trans oil reaches past pump. Lol.


    Hope this helps

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  10. Woodblocker55

    Woodblocker55 Full Access Member

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    Great idea .. even cold change of 5 + quarts and do more often. And like do that 3-4 times in between filter changes . Bet that make the tranny last longer ..

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