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Old 12-05-2019, 03:18 PM
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Flush transmission or not? Scotty says not.

I watched the video below last night and I have to say, I am surprised at his recommendation. It seems to make since for a transmission that hasn't been regularly serviced. But I have owned my jeep since new (21k miles so far) and plan to get the service done around 50k or 60k miles. I had gotten my 96 Cherokee trans done several times before giving it to my brother at 165k and he finally got rid of it at 220k miles with no issues.

Have any of you ever had a transmission fail not long after being flushed and you felt that the service may have finished it off?

So what is your opinion?




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Old 12-05-2019, 03:56 PM   #2
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Always prefer to drop the pan vs flush.. as flush can move the crap around vs draining it out..

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Old 12-05-2019, 04:03 PM   #3
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I do drain, filter and refill. I'm due again in about 20K miles and will do exactly what I did before. Drop the pan, replace the filter and pan gasket, put it all back together and refill.
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Old 12-05-2019, 04:58 PM   #4
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Flushing transmissions hasn't been recommended for years.
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Old 12-05-2019, 05:34 PM   #5
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Rarely have I heard of someone having their transmission flushed and not having problems with it. If you're going to do anything at all, drop the pan, replace filter and refill. Many autos out there really require no servicing at all anymore unless you get water in them.
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Old 12-05-2019, 07:01 PM   #6
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Do a spill and fill.
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Old 12-06-2019, 05:41 AM   #7
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I have done a flush once on an aged trans and it still worked fine, but I never did it again. A good shop will ask you questions before doing a flush, and will tell you any issues are on you if it has not been serviced for a while. Unfortunately most places just want to take your money.
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Old 12-06-2019, 05:55 AM   #8
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I do a pan drop/filter change and a line off fluid exchange, or a pan drop/filter change, and extract fluid via the dipstick tube. IMO the key is not to ever let the fluid get bad enough that a transmission service might kill it. I service my transmissions in a new vehicle after the first 10K miles, then every 35K miles after that.
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Old 12-06-2019, 06:08 AM   #9
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Scotty's a hoot. His videos are awesome. He rags on Jeep quality but that's something we all know and still bought one anyway.
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Old 12-06-2019, 07:22 AM   #10
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I have always flush my autos every 60K. For me it is a piece of mind. Especially when you start getting around the 250 to 300K on the clock. Inspecting the magnet is a good indication of the health of the trans. Did my F250 last summer, ~250K, and the magnet hardly had any “Fuzz” on it since the last time I changed it. I like to flush as this also changes out the fluid in the converter / cooler. There can be more fluid in the converter than the pan.
I think this urban legend of “I changed my transmission fluid and then it blew up” comes from people using the wrong fluid. Either they did it them self’s, or the dealer messed up and put in the wrong fluid.
This is one, of many, things I would not trust anyone to do other than myself.
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Old 12-06-2019, 11:31 AM   #11
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Originally Posted by brian6674 View Post
I think this urban legend of “I changed my transmission fluid and then it blew up” comes from people using the wrong fluid. Either they did it them self’s, or the dealer messed up and put in the wrong fluid.
This is one, of many, things I would not trust anyone to do other than myself.
Not a myth, it will speed up the failure of a transmission that has not been serviced regularly or is already showing signs of issues. It won't break apart when you pull out of the shop, but it will take miles off what life it had left.

Those little particles you get out with scheduled maint. will find a spot and sit there if not serviced on a regular basis. A flush will dislodge those particles. An exchange on the other hand uses the trans. pump to move the fluid, no additional pressure or change in fluid direction.
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Old 12-06-2019, 02:07 PM   #12
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I spent 5yrs doing routine maintenance on Toyota's. We would usually go with a pan drop along with a filter and magnet clean. If it was pretty dark we would use the flush machine. I never saw one come back with issues but then again the 90s Toyota autos were very well built. I would do either assuming its been serviced regularly. But I still prefer to drop the pan to see the magnets and reseal the pan.
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Old 12-07-2019, 02:28 PM   #13
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Always prefer to drop the pan vs flush.. as flush can move the crap around vs draining it out..
Which exactly what Scotty recommended. Not the flush.
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Old 12-07-2019, 04:10 PM   #14
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Which exactly what Scotty recommended. Not the flush.
Yes he usually agrees with my advice.
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Old 12-07-2019, 04:16 PM   #15
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I always drop the pan, change the filter, and refill with new synthetic fluid. Never a transmission fluid flush.
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Old 12-07-2019, 05:45 PM   #16
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Quote:
Originally Posted by jp4me View Post
I watched the video below last night and I have to say, I am surprised at his recommendation. It seems to make since for a transmission that hasn't been regularly serviced. But I have owned my jeep since new (21k miles so far) and plan to get the service done around 50k or 60k miles. I had gotten my 96 Cherokee trans done several times before giving it to my brother at 165k and he finally got rid of it at 220k miles with no issues.

Have any of you ever had a transmission fail not long after being flushed and you felt that the service may have finished it off?

So what is your opinion?

Scotty is alright but Eric the Car Guy and ChrisFix are my faves.

In the video below, ChrisFix does a great job on explaining this entire debate and goes into the reasons people who had problems after a flush have experienced them. Basically, they never did any fluid changes, started experiencing problems at high mileage and then did a flush. Essentially what happens at that point is that the trans was already starting to go, and the gunk between the gears was helping it hold everything together.

Watch this..........
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Old 12-07-2019, 08:18 PM   #17
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We let the dealer handle the trans fluid replacement. Whether it's a flush or fluid exchange, I don't know. I do know that simply dropping the pan and replacing what comes out leaves nearly half of the old, dirty fluid in the system. We haven't had any problem with the dealer doing the work.
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Old 12-07-2019, 09:04 PM   #18
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Had the dealer perform a complete trans fluid flush today on an '97 Toyota. Fluid was dark red and not pink. Didn't expect a significant change in how the car performs. Quicker off the line and shifts are smooth and quick. Fingers crossed....

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