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Discussion Starter #1
So I recently traded in my 2.5 Outback for a 2017 3.6 Outback.

I've noticed a mild vibration during acceleration... It happens only from about 15 to 20 mph. It's a shuddering feeling that's in the accelerator pedal more over the steering wheel. Not too violent or disruptive but definitely there. Has brand new tires from dealer and they are balanced.

Anyone else have experience with this? I realize it's a question with many possible answers. Just wondering if anyone has had this same experience

To add, it is a CVT

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2018 3.6R, CVT (only option that year), nothing like what you’re describing. Find a specialist in your area, or the dealer if still under warranty, get it dealt with.
 

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Trans mount may be failing? Many people swear by the trans mount insert for this issue as well! I've been trying to figure out how to get one
 

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Can't say I've noticed anything like this. Most similar complaints I've seen are when decelerating in that speed range, when the TC disengages (below 20MPH at around 1200RPM), but it seems there have been some threads on the topic, e.g.:

 

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2019 Subaru Outback Limited 2.5i WGM
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It happens only from about 15 to 20 mph. It's a shuddering feeling that's in the accelerator pedal more over the steering wheel.
Does it seem worse when the car is cold? I've noticed that our 2019 2.5i "grumbles" when cold, at the same speed range, when accelerating gradually. It feels like a coarseness in the drive train, but I'm sure it is just a characteristic of the CVT chain. It does get better when the car is warmed up, and accelerating quickly (in a 4 cyl Outback?) is smooth whether cold or hot. Maybe the car just doesn't like getting up in the morning.
 

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Discussion Starter #8
Does it seem worse when the car is cold? I've noticed that our 2019 2.5i "grumbles" when cold, at the same speed range, when accelerating gradually. It feels like a coarseness in the drive train, but I'm sure it is just a characteristic of the CVT chain. It does get better when the car is warmed up, and accelerating quickly (in a 4 cyl Outback?) is smooth whether cold or hot. Maybe the car just doesn't like getting up in the morning.
It seems less significant actually when it's very cold. More prominent vibration when it's warm weather.

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Discussion Starter #9
I've made an appointment for Monday 2/23.

Hoping it will be a more significant vibration type day. Just don't want to be told it can't be replicated... Or that "it's just the way it is". I seem to see that frequently across the board when it comes to some subaru dealer repairs. Fingers crossed.

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...Just don't want to be told it can't be replicated... Or that "it's just the way it is". I seem to see that frequently across the board when it comes to some subaru dealer repairs. Fingers crossed.
Well, based on everything I've read on the topic, you'd better be prepared to be told that. Did you read through that thread I linked to above? LOTS of similar observations, curiously most from 3.6R owners, so that might explain why the behavior is new to you coming from a 4 cylinder (the CVTs are different).

Interestingly, even I commented in that thread that it was something I had noticed - completely forgot about it. Guess I either got used to it or it's no longer noticeable now that I have 90k on the odometer. Anyway, a shudder in this speed range is VERY commonly discussed for ALL Subaru models (google turns up tons of hits on various forums). The fact that TC lockup occurs in this range makes that the likely cause.

After a little more searching, it seems there's an off chance it might be the axles, but good luck getting them replaced under warranty (if you even have any left). I'm betting you'll either have to get used to it or yield to your obsession. ;) Anyway, here's a thread where the complaint was resolved with 2 new front axles:
 

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Discussion Starter #11
Well, based on everything I've read on the topic, you'd better be prepared to be told that. Did you read through that thread I linked to above? LOTS of similar observations, curiously most from 3.6R owners, so that might explain why the behavior is new to you coming from a 4 cylinder (the CVTs are different).

Interestingly, even I commented in that thread that it was something I had noticed - completely forgot about it. Guess I either got used to it or it's no longer noticeable now that I have 90k on the odometer. Anyway, a shudder in this speed range is VERY commonly discussed for ALL Subaru models (google turns up tons of hits on various forums). The fact that TC lockup occurs in this range makes that the likely cause.

After a little more searching, it seems there's an off chance it might be the axles, but good luck getting them replaced under warranty (if you even have any left). I'm betting you'll either have to get used to it or yield to your obsession. ;) Anyway, here's a thread where the complaint was resolved with 2 new front axles:
I'm at 25k miles so I **** well still better have the warranty lol

Yes I've read axles too. And I did read the article you linked.

I won't get used to this, that's for sure. So that will be quite unfortunate to already be trading vehicles. If it's the case, so be it.

I'll update with any findings.

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Trans mount may be failing? Many people swear by the trans mount insert for this issue as well! I've been trying to figure out how to get one
@traildogck hand crafts them right in Colorado, and sells them through ADF under the CKE SSP label.
 

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My car has the same thing. Only under very light acceleration around 15-25mph. Happens more after letting the steering wheel return to center during the same time frame (like after a sweeping right-hander). Feels like slack in the transmission to me, doesn't feel like cv joint issues, feels more like the front and rear wheels are out of gearing slightly. Never had it on a manual. But did experience something similar on a 4runner a few times from 20-35mph (think that was a failing torque converter).
It makes me want to change the trans fluid in the Subaru.
Curious if you measure your tires what you find. My fronts are 1/32 larger than my rears on both.
Also at 25,500miles.
edit: after reading that link, that's funny that it also happened to him with right-hand turns. Wow. I guess I'll have to look at the driver's side cv joint. Maybe I was wrong and it is a cv joint issue.
 
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