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I just uploaded a series of how to videos on YouTube on how to change the transmission fluid. While I was researching our 6T35 transmission, I discovered that the filter is buried deep in the transmission and the only way to change it is to remove the transmission. Since this is so difficult, it makes sense to change the fluid more often than the recommended 50,000 miles. There is a series of 6 solenoids whose screens would clog if you wait too long and the result is codes and transmission problems.
The procedure is actually very easy and requires simple tools to accomplish. The fluid is Dexron 6 and is readily available at Walmart or any parts store.
The entire process was only about 45 minutes. Mostly due to set up. Next time will probably be about 20 minutes. I plan on doing this every 15k miles. Probably overkill but at $17/gall on, its cheap insurance.

Search YouTube under the title of this post. It’s in 4 parts only because I didn’t want to take the time to string them into 1 video.
 

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Thanks for researching the 6T35. I haven't done any drain and fills yet but this spring I plan to start on my '17 for the exact reasons you've stated.
Before I do stuff like this for the first time I try and find out as much as possible what I'm dealing with so this will help a lot.
 

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Great video I used it. I have done 2 flushes in a row I may do a 3rd one today not sure. I would say I am good for another 20k. Like you said once every 15k should be great. I may do one every 10k $17 plus the cost of 1 extra quart is a no brainier compared to a transmission replacement.
 

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Wouldn't this method overfill the transmission with fluid because the transmission fluid needs to be at a specific temperature and the vehicle needs to be level to properly use the fill hole? If you fill it under a certain temperature you will need more fluid as it expands when hot.
 

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If the transmission fluid is at the proper level when you start it will be at proper level when you are done doing a simple drain and fill, AS LONG AS....the fluid in the trans, and the fluid you fill it back up with are the SAME TEMP.

If you do this with the trans hot you'll end up over filling the transmission.
 

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So I followed the instructions by @MannyAPlus to do the transmission fluid change and 2 things I've never seen in the history of trans fluid changes happened.

First off, when I opened the fill plug I had transmission fluid shoot out the side! I'm guessing overfilled at the dealer? I have a lift so the car was level and the car was cold (it was 30 degrees out).

Secondly, I could only get 4 quarts in of the new stuff before fill hole started to show full.

Test drive went okay. Trans shifted MUCH smoother at 40K miles.
 

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If you open the "fill plug" as you call it (it's actually the level check plug) on the side of the trans with the engine off, fluid is supposed to come out.

You say you put 4qts back in. But is that how much cold fluid you took out?
 

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If you open the "fill plug" as you call it (it's actually the level check plug) on the side of the trans with the engine off, fluid is supposed to come out.

You say you put 4qts back in. But is that how much cold fluid you took out?
Sorry, butchered that. You are correct- the fluid shot out the "level" plug.

I have no idea how much came out- at the garage we have these Rolling Oil Drain Pans we used.

The other observation is that after 4 years the screws you put in the drain and level plugs were fairly rusted.
 
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