10-Speed Downshift Harsh
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Cargo Master
Joined: Feb 2004
Posts: 2,101
Likes: 60
From: N. Illinois
10-Speed Downshift Harsh
Lately, after cruising along at highway speeds, when I let off the accelerator and coast, the transmission bangs into 7th or 6th (not sure which) as the truck downshifts on its own. I reported here a few months ago how my truck won’t move when cold for the first few seconds. Dealer finds no issue. Could this be related? The downshift issue is more prevalent now, but I’m betting taking it in, they’ll say “issue not replicated “. I haven’t seen many 10-speed issues lately. Thoughts?
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Cargo Master
Joined: Feb 2004
Posts: 2,101
Likes: 60
From: N. Illinois
it becomes too troublesome or is obvious. If not by warranty, I’ll make a decision then.
Senior User
Joined: Jun 2020
Posts: 133
Likes: 3
I assume this is NOT in sport mode? That is just about the only time I have that issue, every now and then at very low speeds like under 20 I'll have some harsh downshifts in "normal" mode as well. I've made it to 90K, did have the tranny flushed around 50K. Didn't make a difference either way. Never had any non moving issue when cold though either.
Senior User
Joined: Nov 2008
Posts: 411
Likes: 5
From: Cle Elum WA
My story, worked for me....I am not recomending this...this is what worked for me.
The first 2500mi on my truck I drove it back and forth to work over a mountain pass.
i got some hard decelereation down shifts with a bang.
Most concerning were full throttle downshifts one downshift, ok you could here it lugging, and the bam another downshift with a bang.
I figured well this is not right its under warranty, So I figured if it was going to break so be it.
I got on it in consecutive days days a few times going up the pass got a couple more very hard downshifts under full power.
It has never done it again up or down, best working tranmission I have ever had..its a learning transmision..I taught it a lesson, worked for me.
The first 2500mi on my truck I drove it back and forth to work over a mountain pass.
i got some hard decelereation down shifts with a bang.
Most concerning were full throttle downshifts one downshift, ok you could here it lugging, and the bam another downshift with a bang.
I figured well this is not right its under warranty, So I figured if it was going to break so be it.
I got on it in consecutive days days a few times going up the pass got a couple more very hard downshifts under full power.
It has never done it again up or down, best working tranmission I have ever had..its a learning transmision..I taught it a lesson, worked for me.
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New User
Joined: Nov 2020
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Theres a ton of issues with the valve bodies on these. You most likely have a valve sticking. However, some of these have a PCM reflash at the dealer which is supposed to help.
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Senior User
Joined: Nov 2008
Posts: 411
Likes: 5
From: Cle Elum WA
Oh, what year is your truck?
Lead Driver
Joined: Sep 2006
Posts: 7,907
Likes: 143
All the shift modes available work differently.
No one ever says what mode they are using.
Only shift perceptions they feel are not normal.
Not saying there is no trouble but it's important. to know.
For example the ECO mode and wet/snow modes are very different.
I use them for better fuel mirage because they skip gears I don't need and up shift at lower speed I don't need in normal driving. It saves gas.
I see 22mpg with driving while watching the Mpg display to keep the green waterfall as high as possible.
When I refill at the same station all the time, it shows using 91 grade.
2018 5L.
No one ever says what mode they are using.
Only shift perceptions they feel are not normal.
Not saying there is no trouble but it's important. to know.
For example the ECO mode and wet/snow modes are very different.
I use them for better fuel mirage because they skip gears I don't need and up shift at lower speed I don't need in normal driving. It saves gas.
I see 22mpg with driving while watching the Mpg display to keep the green waterfall as high as possible.
When I refill at the same station all the time, it shows using 91 grade.
2018 5L.
Thread Starter
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Cargo Master
Joined: Feb 2004
Posts: 2,101
Likes: 60
From: N. Illinois
Sorry I have been out. Thanks for the comment. I will be taking it in next week. It has only gotten worse. Now, if I shift to neutral and then to park, it banks. Weird. Dealer said he’d check for a program update.
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