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08-29-2018, 02:22 AM | #1 |
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DIY: Automatic Transmission Fluid Change
Howdy,
As part of the process of installing an ATF cooler this week, I had to do an automatic transmission fluid change, and I noticed there wasn't any DIY guides on the forums for this yet, so figured I'd write one up. Disclaimer: While I didn't think the process itself was all that bad after I'd done it once, it is one of those things where if you mess up the fluid leveling procedure it could cause serious damage to your transmission. So be aware, pay attention, and if in doubt take your car to a professional. Tools Needed:
Reference Documentation: Steps:
That's it, you're done. In simplified form, you do 3 drain/refills, then do a fluid leveling procedure. The reason you do this is because most of the fluid in the transmission is not in the transmission pan but is actually held in the torque converter and the valve body. By shifting after each fill procedure you're forcing the fluid to move around in the transmission and exchange. I hope this helps someone! Last edited by Tristor; 02-07-2021 at 12:26 AM. Reason: Updating part numbers |
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08-29-2018, 02:26 AM | #2 | |
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A little suggestion it might help to lower the size of the photos and put them below or with the step they correspond to. Also nice job using imgur to host the images, I don't see alot of people do that on the forum for some reason people use photobucket or others. Also I wouldn't suggest an exact amount for every fill and run cycle, I filled it till it dripped out the refill plug.
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08-29-2018, 02:31 AM | #3 | |
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Thanks! I resized the images and ran them through ImageOptim and re-uploaded, so maybe they'll load much faster and be more manageable when zoomed in now. For the refills, I actually "cheated" and did 2 US quarts on the first one, 2 on the second, and 3 on the third go around + the dregs, then leveled it. I had bought 7 quarts, I used 7 quarts I never had anything drip out of the refill plug. |
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02-04-2019, 04:42 PM | #4 | |
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02-07-2019, 10:11 PM | #5 |
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With the engine running, if it trickles out at the right temp your good if nothing comes out its low if too much comes out its over fill,
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02-11-2019, 03:02 PM | #6 | |
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Everything is done with the engine running in these steps. You need the engine running to go up to temp and it requires the engine running to shift the transmission during the steps to circulate fluids as well. |
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06-28-2019, 06:57 AM | #7 |
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wow I can't believe we didn't have a proper DIY thread until 2018 !
thank you very much for your post, it makes things a lot easier. the below resume helps understand the whole process: drain/overfill, engine on, Park to M & back drain/overfill, engine on, Park to M & back drain/overfill, bring oil to "proper" temp, & drain through overflow until it's thin as a thread. tighten everything to spec. |
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09-14-2019, 01:47 PM | #8 |
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So could you just change out the fluid once.
Let it run until the next oil change and change it out again with the next oil change or two. |
02-08-2020, 03:16 AM | #9 |
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So I went to a local subaru specialized shop to get my automatic transmission oil changed.
They drained the ATF, put new ATF, shifted it and made sure fluids was the correct level. They also changed the o rings and ended up only using 3 quarts. They told me they never done it any other way, not even putting a jumper wire to make sure the fluid was the right temperature. Should I be worried and do it within like 5k miles or 30k miles or should I just wait until the next internal, which is 60k miles, to change it again? |
03-07-2020, 04:17 AM | #10 |
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Can you do a video please?
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03-07-2020, 09:35 AM | #11 |
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It’s as simple as @86Kenshins post a few posts up. Only missing step is trans temp. You’ll either need to do the extra steps to get the temp lights. Or just go buy a scangauge and you can always see trans temp. I got AFR, oil, coolant, trans temp always on mine it’s great. And makes the trans fluid change procedure a breeze.
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03-08-2020, 07:50 AM | #12 |
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Does a OBDLink read trans temp?
So on the third drain/fill from the plug WS from above pic...get the oil to temp then undo the overflow bung till nothing comes out? How many L do you use? Last edited by Halo_2; 03-08-2020 at 08:43 AM. |
03-08-2020, 03:23 PM | #13 | |
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Approximately 2L or 2.1quarts each drain/fill, i would just get 7L/Q to be safe. 3 drain/fill. After each fill need to turn car on idle for a sec and slowly move from P to D and back stopping for at least 10seconds at each point, do this twice per each drain/fill so 6 times total. keep foot on brake entire time if still on stands. This helps circulate the new fluid. On the final drain/fill overfill it, (id just use whatever you have remaining maybe save .2L to be safe assuming you got 7L to start). Do the P-M idle procedure above. Then let the car sit to cool down assuming its over 108F by now. Then with the car running in idle as soon as it hits 108F pull the overflow plug and cap it when the stream is a very thin thread but not completely stopped. (had wife sit in car to tell me the second it hit 108f as you can’t go over 117F so need to be quick especially if its way overfilled, might need to cap plug cooldown and try again before its done draining to “spec”). The final leveling should be done on as level of ground as possible most garages should be fine assuming you jack both ends up evenly. Summary Engine off - Drain/fill 2L - idle P-M and back twice stop 10 seconds each point Engine off - Drain/fill 2L - idle P-M and back twice stop 10 seconds each point Engine off - Drain/fill 2.5L - idle P-M and back twice stop 10 seconds each point Engine off - cool down trans temp to below 108F. Idle warming up trans temp to above 108F but below 117F - pull overflow plug and replug when stream is a very thin thread but not completely stopped. |
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03-14-2020, 01:22 AM | #14 |
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Anyone know of a scan tool that can read transmission temps.
Got a OBDLink MX+, it works in default mode but cant read transmission temp. I tell it its a scion frs and download the enhanced add-on, it seems to works and finds a shitload of modules but then won't show them. Chose Network A There is no such thing a toyota 86 listed in enhanced add on. |
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