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Old 04-19-2021, 07:24 AM   #1
silverscreamo
 
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Possible Shudder Solution for 8L45 - Lubeguard?

Came across this: https://www.lubegard.com/wp-content/...ll_sizes_2.pdf

I know transmission shudder is a big issue for the 8L45. I, thankfully, have not experienced any shudders, even under WOT. That said, thinking of adding this as a precautionary measure.

That said, curious to hear if anyone has tried this already and what their experience was.
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Old 04-19-2021, 07:30 AM   #2
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I read about that too, but I have my doubts on it. Mine has the 8L45, and I had the latest fluid and flush procedure done about 30,000 miles ago, and it's still doing great
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Old 04-19-2021, 07:33 PM   #3
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IMO the best precautionary measure is having a dealership properly perform TSB 18-NA-355 on the car that is known to fix it in every case I've heard about and thus certainly as effective in preventing it as possible (see related poll here). You don't even have to prove any shudder condition anymore.

Picture dumping Lubeguard in, getting the shudder nevertheless and then the dealership charging you for the flush despite the car being under powertrain warranty, simply because of the use of this aftermarket additive they may be able to detect.
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Old 04-20-2021, 06:53 AM   #4
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Quote:
Originally Posted by arpad_m View Post
IMO the best precautionary measure is having a dealership properly perform TSB 18-NA-355 on the car that is known to fix it in every case I've heard about and thus certainly as effective in preventing it as possible (see related poll here). You don't even have to prove any shudder condition anymore.

Picture dumping Lubeguard in, getting the shudder nevertheless and then the dealership charging you for the flush despite the car being under powertrain warranty, simply because of the use of this aftermarket additive they may be able to detect.

Thanks, you make a good point. I'll talk to the dealership about getting it done this weekend then. As it turns out, I had the car in for servicing this past weekend and they ended up scratching the passenger door AND leaving a mist of white paint... so they are already giving me a loaner while they fix that anyway.
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Old 04-20-2021, 02:57 PM   #5
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First, the shudder happens more with low engine load. Not under WOT.

Think, cruising with very little throttle (but still some). That's when you'll experience shudder.

If your automatic transmission has fluid from before the 1st quarter of 2019, it's not a question of IF you'll get shudder. Just when. It's not a question of IF you should get new fluid put in, but how much do you want to procrastinate biting the bullet?

There are additives that will help mitigate the problem that the old fluid has with attracting water due to the low temp the trans fluid generally stays at and it's natural hydrophilic properties. These are not real fixes though and will only buy you some time.

A full fluid flush with new blue label fluid is the only way to fix the issue. If you wait until the shudder is very noticeable, you run the risk of causing perm damage to your torque converter due to the varnishing effects of the slipping and cavitation of water boiling in the fluid. You should do the new fluid before you feel the shudder if you are fairly sure you're currently using fluid from before Q1 2019.

if your car was made after q1 2019, then you already have the new fluid and should not experience shudder ever unless you have an unrelated issue.
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Old 04-22-2021, 03:26 PM   #6
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Quote:
Originally Posted by silverscreamo View Post
Thanks, you make a good point. I'll talk to the dealership about getting it done this weekend then. As it turns out, I had the car in for servicing this past weekend and they ended up scratching the passenger door AND leaving a mist of white paint... so they are already giving me a loaner while they fix that anyway.
I would get the car back as fast as possible and never return.

If they can't do simple service without ****ing something up, I wouldn't trust them at all with something complex like the fluid flush.

And remember that fluid flush doesn't include a filter change. And as I understand it, the shudder is from debris in the transmission fluid.
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Old 04-26-2021, 10:43 AM   #7
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Quote:
Originally Posted by Spaceme1117 View Post
I would get the car back as fast as possible and never return.

If they can't do simple service without ****ing something up, I wouldn't trust them at all with something complex like the fluid flush.

And remember that fluid flush doesn't include a filter change. And as I understand it, the shudder is from debris in the transmission fluid.
Before this, they also dented my wife's Cruze literally just the week before. They had to fix that too. Back-to-back issues like this have certainly resulted in my looking for another dealer to work with in the future. Prob is, they own most Chevy dealerships in my area and the few they don't own get terrible reviews.

To their credit, this is the first time I've had any serious issues with them. In the past, their work has always been stellar, so I'm leaning towards chalking this up to whatever bonehead they had working on those two weekends as opposed to the whole dealership.

I'm going in today and I'll be speaking to them about the transmission flush. I'm still under the powertrain warranty so I believe it is covered, but if they give me the run around on that, I'll just take it to the family mechanic. I'd rather try with them first though because at least I'm getting a loaner and not paying for a rental out of pocket.
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