[Cyrus]

Originally Posted by cjperformance

Dealer isn't guaranteed to do it right anyway. Had dealer do mine under warranty. They flushed it once, not 3 times... fixed it for just long enough to get out of warranty, then it came back. Plus found out later, they left it 4-5 quarts low when I had my TC replaced with a stall converter at a performance shop. They expected it to take 1-2 quarts w/ the TC swap... it took 6 qts....

In hindsight, I would have flushed it myself or taken to a reputable shop to get the flush done, then do the tuning change. The setting is in the TCM, so you would need to pull the TCM and send to HPTuners for an unlock. Then pay the license fees for at least the TCM. Not sure if you need ECM too. Anyway, the setting to update is super easy.

I can vouch that the tuning change works, at least for the short term. If you plan on doing other mods, go the tune change route because you'll need everything unlocked anyway. If you don't plan on doing any other tune changes, just do the flush, wait for it to come back, then put a replacement converter in it.

It's a tough choice and it sucks on an otherwise stellar car. I have a 50th also

Hopefully my dealer knows how to do the flush properly. They said they've done serveral trucks already and it seemed to fix the issue. Long term who knows. I also read that letting the car sit for long periods of time makes things worse. Which might explain why I noticed the shudder for the first time on my first drive out of winter storage. Car hadn't moved in 7 months.

As for tuning, what is the recommended tune for these cars ? On my previous 5th gen Camaro I had a "Trifecta" tune installed. Didn't notice a huge difference however it was a manual. I think the tunes work better on the autos. I paid about $600 for mine installed but that was about 4-5 years ago.

[ctrlz]

Originally Posted by Cyrus

Didn't think any garage would want to follow the bulletin's instructions. Also, what if that doesn't fix it, at least at a dealership they would be responsible.

I think your best bet is to let the dealership do the fluid exchange and hope it solves the problem.
Unfortunately, if the fix is not permanent, I think the dealer is just going to say you were too far gone and you need a new torque converter.

If you are planning to keep the car a long time, you could also just ask for the price up front to replace both the fluid and the torque converter.

[Cyrus]

Tranny flush is done. No more shudder. Hopefully it lasts I feel like it should I barely put any miles on the car since the issue started. I'll try driving it more than usual the next month to be sure. Only 5-6 weeks away from winter storage.

As per my dash cam, this procedure only took them 1hr 45mins to complete.

Still wondering about a tune. I have the GM CAI which came with its own tune not sure how that effects things.

[ctrlz]

Originally Posted by Cyrus

Still wondering about a tune. I have the GM CAI which came with its own tune not sure how that affects things.

Does this mean you have the GM CAI with the tune already installed, or you are wondering if you need the tune (which dealers will no longer install)?

Either way I think this has nothing to do with transmission/TC issues.

[Cyrus]

Originally Posted by ctrlz

Does this mean you have the GM CAI with the tune already installed, or you are wondering if you need the tune (which dealers will no longer install)?

Either way I think this has nothing to do with transmission/TC issues.

Yes I already have the GM CAI installed and tuned. My question was, can I get an after market tune now or will that mess up the computer due to the GM tune.

And yes this has nothing to do with my shudder issue but many have suggested I get a tune now to avoid having the shudder problem return in the future.

[arpad_m]

Originally Posted by Cyrus

Yes I already have the GM CAI installed and tuned. My question was, can I get an after market tune now or will that mess up the computer due to the GM tune.

And yes this has nothing to do with my shudder issue but many have suggested I get a tune now to avoid having the shudder problem return in the future.

A proper tune is custom made for your vehicle, considering whatever modifications you may already have.

Certain generic ("canned" or "boxed") tunes do exist, but I'd steer clear of them as they are almost always suboptimal, catering to the lowest common and safe denominator. I suggest that you work with an actual, experienced tuner on a calibration specific to your car.

In fact, that's exactly what I did.

[Cyrus]

Originally Posted by arpad_m

A proper tune is custom made for your vehicle, considering whatever modifications you may already have.

Certain generic ("canned" or "boxed") tunes do exist, but I'd steer clear of them as they are almost always suboptimal, catering to the lowest common and safe denominator. I suggest that you work with an actual, experienced tuner on a calibration specific to your car.

In fact, that's exactly what I did.

Was thinking this:
https://www.trifectaperformance.com/...#elProductInfo

I worked with one of their reps with my 2010 SS years ago and it was a good expierence.

Gains on a 2017 Camaro V8 are +35 ft-lbs and +40 WHP at the wheels on 91 Octane. Also, the Automatic Transmission gets a Tune to work in unison with the engine’s Tune to optimized performance. Shifting logic is improved and shifts have a more sportier character than Stock.

Will this do anything to help prevent the shudder from returning in the future ?

[arpad_m]

Originally Posted by Cyrus

Was thinking this:
https://www.trifectaperformance.com/...#elProductInfo

I worked with one of their reps with my 2010 SS years ago and it was a good expierence.

Gains on a 2017 Camaro V8 are +35 ft-lbs and +40 WHP at the wheels on 91 Octane. Also, the Automatic Transmission gets a Tune to work in unison with the engine’s Tune to optimized performance. Shifting logic is improved and shifts have a more sportier character than Stock.

Will this do anything to help prevent the shudder from returning in the future ?

If it properly adjusts the slip tables and/or make pressure adjustments, then probably yes. No idea if they will let you know whether or not this is the case. I haven't purchased anything from Trifecta, but there are others in the forum who did, perhaps they can chime in with their experiences.

For the record, I did try to consult with this company when I had a V6 and they were very "customer unfriendly" to me, but that's just one data point, plus as I said, I strongly prefer an actual professional tuner looking at my actual car and specifically tuning it.

I do know tuners also have templates and base tunes, obviously nobody would want to start from scratch with each customer, but they will also do fine adjustments and make sure everything is optimal. For example, on one occasion Ted Jannetty did a street tuning session with me and adjusted throttle response on the fly based on my actual impressions and requests, you will not get anything like this from a canned Trifecta (or other) tune.

[arpad_m]

...how I ended up being the resident "level 1 A8 support contact" here, I have no clue

[BWoods]

Originally Posted by RockerC

did the flush routine @ 15k with no result. TC replaced to no effect. entire transmission replaced under warranty at 20k. GM did not want to pay and claimed that a dyne tune invalidated the warranty. Dealer went to bat for me and trans got replaced but my entire powertrain warranty is now invalid.

Worked fine until two weeks ago at 41k when shudder suddenly started again: unmistakable symptoms once you've had it. Will make appointment with dealer next week.

@RockerC I have the same problem. I had the triple flush and that did nothing, they replaced the TC and shudder was gone for about 3k miles and now it is back. What did your dealer say when you took it in?

[animefan0611]

2017 Camaro 2LT 4-cyl with 24k miles here. One month after factory warranty expired, mine developed the transmission shudder. They did the flush per tsb 18-NA-355 and so far seems ok when I drove it home today.

[Giri]

Mine was fixed under warranty twice and then it ended up shuddering again once the warranty expired. I ended up taking it to a transmission shop that drained and refilled it for an astronomical price

[Bumbleboy92]

Originally Posted by Giri

Mine was fixed under warranty twice and then it ended up shuddering again once the warranty expired. I ended up taking it to a transmission shop that drained and refilled it for an astronomical price

Sounds like a classic case of the torque converter being damaged from the incorrect fluid from factory. The flushes would have fixed it if caught early on but since it kept coming back then they would have had to replace the torque converter. I remember reading they stopped doing that a while back though