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Old 01-24-2023, 06:07 AM   #1
30-30
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Default Transmission fluid change interval

Everyone seems to have a strong opinion on this one. When to change, and flush or pan drop?

My wifeís Ď19 Dodge Grand Caravan rolled 65,000 miles. Mostly around town, not highway. Manual says change at 60k for heavy service and 120k for normal use.

Would you treat a truck differently?
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Old 01-24-2023, 06:11 AM   #2
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I would follow the manufacturer’s instructions. If chit hits the fan, you can demonstrate you followed their recommendations.
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Old 01-24-2023, 07:03 AM   #3
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Iíve owed several cars and trucks and never once changed the transmission fluid.


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Old 01-24-2023, 07:23 AM   #4
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Id keep driving to the 120k mark unless the oil starts to turn off color or smells funny.
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Old 01-24-2023, 07:24 AM   #5
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Never ever change the transmission fluidÖunless itís empty or your wanting to get it rebuilt


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Old 01-24-2023, 07:30 AM   #6
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I change fluid and filter per the manual. I never flush it. That is asking for trouble, especially past 150k.
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Old 01-24-2023, 07:37 AM   #7
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Change it per the manual, I can’t understand why some people don’t believe it maintaining their transmission yet they change their oil every 3,000 miles. Engines would run for 100,000 miles on the same oil as well but they do seem to do it.
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Old 01-24-2023, 07:40 AM   #8
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Ball Park....100K
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Old 01-24-2023, 07:41 AM   #9
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Drove my last chevy truck to 304, 000 miles and never changed the tranny fluid. Never had an issue.
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Old 01-24-2023, 07:42 AM   #10
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With these newer trannys it definitely needs to be changed per manufacturers guidelines , if not 5k before! Especially GM products!
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Old 01-24-2023, 07:59 AM   #11
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New vehicles say never change it and only stealerships can get it out and back in. No drain plug.
I would go for the 100K change...
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Old 01-24-2023, 08:03 AM   #12
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Quote:
Originally Posted by Johnny Dangerr View Post
New vehicles say never change it and only stealerships can get it out and back in. No drain plug.
I would go for the 100K change...
I donít know which New vehicle you own but mine definitely say to change it! 2016 & 2021 General Motors trucks!
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Old 01-24-2023, 08:20 AM   #13
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200K on my last chevy truck and never touched it.
One thing you NEVER want to do is have one of these oil change places talk you into back flushing and changing the fluid. That will result in almost instant failure. There is only one way to change tranny fluid and that requires some disassembly. IF YOU MUST, have a dealer or transmission repair shop do it.
It might also be a good time to replace the tail shaft bearing and seal.
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Old 01-24-2023, 08:25 AM   #14
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Quote:
Originally Posted by muzzlebrake View Post
200K on my last chevy truck and never touched it.
One thing you NEVER want to do is have one of these oil change places talk you into back flushing and changing the fluid. That will result in almost instant failure. There is only one way to change tranny fluid and that requires some disassembly. IF YOU MUST, have a dealer or transmission repair shop do it.
It might also be a good time to replace the tail shaft bearing and seal.
What year model was that truck and which tranny did it have in it?
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Old 01-24-2023, 08:26 AM   #15
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Pan drop and filter change around 100k. My last truck has 240k and still going. The one before it had 265k when I sold it. I pull a loaded down dual tandem gooseneck 2-3 days a week with all of them. The 265k was a hotshot truck with a 40ft gooseneck from day 1.
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Old 01-24-2023, 09:06 AM   #16
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Need to look into it on my 2019 f150. I’m at 64k. Don’t know what the manual suggests.

My wife’s 2015 Grand Cherokee is a sealed transmission. No idea what the service interval is on it either, if there is one. But dealer will have to do it.

I’m not one to mess with transmissions, so both would be a dealer job. Gah I don’t want to pay for that if it’s something the manual suggests.
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Old 01-24-2023, 09:09 AM   #17
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FordPass app gives me an interval. All the way until 100k itís just a check the transmission fluid.
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Old 01-24-2023, 09:12 AM   #18
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Never, unless the tranny goes out. My 2013 Ram had 325,000 miles on it when I sold it to a friend. She is still driving it with no trouble.
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Old 01-24-2023, 09:14 AM   #19
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2017 Expedition manual says 100k. Can’t even check the level, no dipstick. Flushing is bad, last Expedition I had flushed, tranny went out 2 weeks later.
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Old 01-24-2023, 09:17 AM   #20
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Never change it! We’ve changed if on 2 trucks and within 3 months both Transmissions went out. I spoke to a good friend who’s used to work in a used car dealership and he warned against this. He said it never failed every time they changed it within months they brought them back with transmission problems. I wouldn’t do it.
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Old 01-24-2023, 09:19 AM   #21
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Quote:
Originally Posted by Mayhem View Post
Iíve owed several cars and trucks and never once changed the transmission fluid.


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350K on My 7.3L, never changed it. I'm knocking on wood as I type this.
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Old 01-24-2023, 09:20 AM   #22
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Originally Posted by Hoggslayer View Post
350K on My 7.3L, never changed it. I'm knocking on wood as I type this.
HmmmÖ. What does knocking on wood do?
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Old 01-24-2023, 09:20 AM   #23
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Never touch it
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Old 01-24-2023, 09:28 AM   #24
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My 06 Silverado, I dropped the pan and changed the filter and and filled it back up at 200k. Iím knocking on the door of 400k and thinking oh doing it again.
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Old 01-24-2023, 09:31 AM   #25
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Quote:
Originally Posted by Bucknaked View Post
HmmmÖ. What does knocking on wood do?
Just a old superstition. Knock on wood for good luck.
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Old 01-24-2023, 09:47 AM   #26
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I’ve always changed at 30k on my Superduty trucks, but the current 2019 has no drain plug. I’m up to 65k now. I like to drain, drop pan, change filter, and refill with 9 qts.
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Old 01-24-2023, 10:04 AM   #27
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Originally Posted by Hoggslayer View Post
Just a old superstition. Knock on wood for good luck.
What is Luck?
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Old 01-24-2023, 10:27 AM   #28
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What is Luck?
Its where preparation meets opportunity.
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Old 01-24-2023, 10:32 AM   #29
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Quote:
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What is Luck?
what happens when you knock on wood.
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Old 01-24-2023, 10:46 AM   #30
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Quote:
Originally Posted by bucknaked View Post
what year model was that truck and which tranny did it have in it?
2005 4l60e
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Old 01-24-2023, 10:50 AM   #31
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Originally Posted by muzzlebrake View Post
2005 4l60e
I figured so! You definitely can not do that with these newer 1/2 ton trannys!
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Old 01-24-2023, 10:51 AM   #32
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My 2019 High Country has the 10 speed and no dip stick. Since it was jointly developed by Ford and GM I hold my breath every time I put it in gear since it has Ford fingerprints all over it.
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Old 01-24-2023, 10:54 AM   #33
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Quote:
Originally Posted by muzzlebrake View Post
My 2019 High Country has the 10 speed and no dip stick. Since it was jointly developed by Ford and GM I hold my breath every time I put it in gear since it has Ford fingerprints all over it.
I hold my nose erry time I get on the road in my 2 gm vehicles- Seriously! Itís a crying shame that Gm had to get Ford help them build a quality transmission!

Now back to normal maintenance intervals
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Old 01-24-2023, 11:01 AM   #34
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Quote:
Originally Posted by Bucknaked View Post
What is Luck?
Itís what you need a lot of if you have no brains.
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Old 01-24-2023, 11:10 AM   #35
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Never flush it. If you want to let it go without changing it, at least put Amsoil in it. Same with your diff.
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Old 01-24-2023, 11:50 AM   #36
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I would never flush. Maybe fresh fluid and filter. My ford f150 simply says to check level even up to 200k mile service.

My sequioa made well past 200k and never changed.
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Old 01-24-2023, 12:27 PM   #37
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What causes trans to fail after a flush?
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Old 01-24-2023, 12:35 PM   #38
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My truck just rolled over 90k and I changed it. I will do it again in another 100k miles. I believe in fluid change and filter change. NOT flush. The older fluid in the torque converter with the newer percentage of fluid maintains a healthy balance in my opinion. Those that do nothing till its black and the unit is failing, go right ahead. I have had several vehicles make it till 300k miles on the original trans with never a problem.
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Old 01-24-2023, 02:05 PM   #39
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Quote:
Originally Posted by Bucknaked View Post
HmmmÖ. What does knocking on wood do?
Knocking on wood is a Pagan ritual, something about forest spirits.
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Old 01-24-2023, 02:16 PM   #40
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Quote:
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What causes trans to fail after a flush?
From what Iíve been told, there is buildup on the clutches and other internal workings of the transmission when it has high mileage. When you do a flush it breaks up some of that crud, plus the detergents in the new fluid further break it all down. Next thing you know you have slipping clutches and a bad transmission.


Something along those lines.
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Old 01-24-2023, 02:19 PM   #41
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Change it when its scheduled by Manufacturer.
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Old 01-24-2023, 02:36 PM   #42
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I have 165,000 on my 15 F250 and asked my mechanic and he said at this point definitely don't touch it, he was local Ford service manager at one time. As far as earlier mileage no idea....
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Old 01-24-2023, 02:45 PM   #43
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Quote:
Originally Posted by justletmein View Post
Knocking on wood is a Pagan ritual, something about forest spirits.
Nailed It! Superstition
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Old 01-24-2023, 03:03 PM   #44
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Quote:
Originally Posted by muzzlebrake View Post
My 2019 High Country has the 10 speed and no dip stick. Since it was jointly developed by Ford and GM I hold my breath every time I put it in gear since it has Ford fingerprints all over it.
Are you implying ford could design a worse trans than GM!!??
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Old 01-24-2023, 03:11 PM   #45
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Quote:
Originally Posted by muzzlebrake View Post
My 2019 High Country has the 10 speed and no dip stick. Since it was jointly developed by Ford and GM I hold my breath every time I put it in gear since it has Ford fingerprints all over it.
If it is like the Ford tranny, the dipstick is down under, next to the transmission pan.
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Old 01-24-2023, 08:06 PM   #46
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Once every torque converter.
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Old 01-24-2023, 08:18 PM   #47
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Quote:
Originally Posted by Bucknaked View Post
I hold my nose erry time I get on the road in my 2 gm vehicles- Seriously! Itís a crying shame that Gm had to get Ford help them build a quality transmission!

Now back to normal maintenance intervals

my wife and I have driven nothing but ford for 25 years and we run them high miles (my truck has 179k, wifeís Explorer 175k, daughters f150 185k ) never have I had a transmission issue on one ford

Now my buddy owns a fleet biz, over 250 fleet trucks and he said he canít keep a transmission in a Chevy

I hear they are still having issues even with the collaborative transmission which tells me Chevy has other engineering issues


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Old 01-24-2023, 09:21 PM   #48
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Quote:
Originally Posted by OldRiverRat View Post
my wife and I have driven nothing but ford for 25 years and we run them high miles (my truck has 179k, wifeís Explorer 175k, daughters f150 185k ) never have I had a transmission issue on one ford

Now my buddy owns a fleet biz, over 250 fleet trucks and he said he canít keep a transmission in a Chevy

I hear they are still having issues even with the collaborative transmission which tells me Chevy has other engineering issues


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I have been seeing talk about the 10 speed also! My truck is a 21 at4 1500 and I have 18k with no issues ĎYetí ! I have said it many times but I donít trust my truck and every time I get into it Iím just knowing something is going to happen with either the motor or tranny. I did good on my purchase as far as paying under invoice but Iím going to watch the market this year and try to get into another diesel 3/4 ton truck. Iíll take a hit but I can not stay in this vehicle! I donít know how all of these General Motors loving nuts still support them. Sorry nuts
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Old 01-24-2023, 10:21 PM   #49
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Quote:
Originally Posted by Bucknaked View Post
I have been seeing talk about the 10 speed also! My truck is a 21 at4 1500 and I have 18k with no issues ĎYetí ! I have said it many times but I donít trust my truck and every time I get into it Iím just knowing something is going to happen with either the motor or tranny. I did good on my purchase as far as paying under invoice but Iím going to watch the market this year and try to get into another diesel 3/4 ton truck. Iíll take a hit but I can not stay in this vehicle! I donít know how all of these General Motors loving nuts still support them. Sorry nuts
Tried the half ton thing for 23k miles. Wasnít for me. Thought about a tundra, but they went v6 turbo and I was out again.
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Old 01-24-2023, 11:41 PM   #50
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Quote:
Originally Posted by jjaimes View Post
Never change it! We’ve changed if on 2 trucks and within 3 months both Transmissions went out. I spoke to a good friend who’s used to work in a used car dealership and he warned against this. He said it never failed every time they changed it within months they brought them back with transmission problems. I wouldn’t do it.
Then they didn't do it right, there are some special procedures you need to take to get it to pick all the new fluid up, especially with these new 8 speed and up transmissions. The ones that fail shortly after change are almost always short filled. Have always changed fluid 5K before recommened interval and any of these new transmission that say they will last lifetime of the vehicle I change those at 100K.
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