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Old 08-18-2018, 08:23 AM
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yellow2007
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I started a thread a while back regarding an oscillating "shudder" at highway speeds. It didn't match the speed and stayed constant regardless if I accelerated or not. Well I had my transmission fluid,filter and gasket changed at the dealership 4 weeks ago and I noticed it was less pronounced. Still did it but not nearly as bad. I had the transmission flushed last weekend and it is completely gone. My mechanic said the fluid was dark and that's after having new fluid put just the transmission. I am tossing this out there for anybody else that may be experiencing or run into it later. I am being told it was the fluid in the torque converter.

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Old 08-18-2018, 11:59 AM
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enventr
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Thanks for the tip. How many miles on your 07?
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Landru (08-18-2018)
Old 08-18-2018, 12:27 PM
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Flushed? As asked, how many miles?
IIRC book says every 50K, though I'd guess many go well beyond.

Thing is, if say at 90-100K a flush could likely cause embedded debris to break loose.
Trans fluid's a powerful cleaner, unfortunately not all crap gets flushed completely out.
Chunks of crap only loosened break away winding up clogging many tiny passages/valves, necessitating a rebuild.

Not a Vette, but my Cady had 100K before tranny began to slip, very uncharacteristic reminding me fluid had never been changed.
Wanted a ;flush', wrench advised against it for above stated reason.
Said he'd drain ever drop he could & refill whatever it needed w/ fresh, leaving embedded crap alone..
Of 10 qt capacity it needed 7, all but 3 remained.
Tranny is like new, no slippage whatsoever & little concern it may crap-out completely.

Glad you're golden now and hopefully for many more happy miles.
Just don't be surprised if things go sideways down the line w/ tranny either.
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Old 08-19-2018, 11:38 AM
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Originally Posted by enventr View Post
thanks for the tip. How many miles on your 07?
136k.......
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Old 08-19-2018, 11:42 AM
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Originally Posted by Landru View Post
Flushed? As asked, how many miles?
IIRC book says every 50K, though I'd guess many go well beyond.

Thing is, if say at 90-100K a flush could likely cause embedded debris to break loose.
Trans fluid's a powerful cleaner, unfortunately not all crap gets flushed completely out.
Chunks of crap only loosened break away winding up clogging many tiny passages/valves, necessitating a rebuild.

Not a Vette, but my Cady had 100K before tranny began to slip, very uncharacteristic reminding me fluid had never been changed.
Wanted a ;flush', wrench advised against it for above stated reason.
Said he'd drain ever drop he could & refill whatever it needed w/ fresh, leaving embedded crap alone..
Of 10 qt capacity it needed 7, all but 3 remained.
Tranny is like new, no slippage whatsoever & little concern it may crap-out completely.

Glad you're golden now and hopefully for many more happy miles.
Just don't be surprised if things go sideways down the line w/ tranny either.
I weighed all the pros and cons and decided since things like embedded debris etc are theoretical but replacing 1/3 of the fluid is not, it only made sense and the fact that even after a recent transmission service the fluid was dark sealed the deal. I will still keep my fingers crossed that the later doesn't come true.
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Old 08-19-2018, 03:09 PM
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Originally Posted by yellow2007 View Post
I weighed all the pros and cons and decided since things like embedded debris etc are theoretical but replacing 1/3 of the fluid is not, it only made sense and the fact that even after a recent transmission service the fluid was dark sealed the deal. I will still keep my fingers crossed that the later doesn't come true.
The system holds 13.24 quarts and a drain, with pan removal and new filter requires about 6.5 quarts. If you only had about 1/3 of the fluid (about 4 quarts) replaced on your "recent transmission service", it's likely that they only drained the pan by removing the check plug and didn't remove the pan which still held about 2 - 2.5 quarts.

Although glad that everything is working well now, in the future you may want to change fluid more often and assure who is doing it, is doing it correctly.
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Old 08-19-2018, 03:50 PM
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Yep, problem with just pulling the pan, is your are only replacing the fluid in the bottom of the pan, and not the fluid that is still in the trans passages, in the torque converter, nor all the fluid that is in the cooler and lines.

So flush system using the cooler lines will push most of the old fluid out, and replace it with new fluid.

As for why GM does not put a drain plug in the torque converter is still a semi mystery, but the fact that the trans fluid should be power flushed ever 50K via the flush system before the fluid has become burnt or really contaminated, means that you really don't need a manual drain port on the torque converter to get the fluid out that way instead.
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Old 08-20-2018, 06:59 PM
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Several years ago I watched a a service guy at a Valvoline (I think) quick-change oil station use a machine to completely replace all the fluid in an auto. trans. car by connecting to the cooling lines and running the car at idle until all fluid had been exchanged; took a minute or less. The reservoir with the new fluid in it had a sight window so he could monitor the exchange. I liked this approach. The only downside is the filter doesn't get changed, but if the old fluid looks clear may be able to get by without changing the filter. Each of these approaches has it's pros and cons
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Old 08-21-2018, 06:51 AM
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Originally Posted by RobJoy View Post
Several years ago I watched a a service guy at a Valvoline (I think) quick-change oil station use a machine to completely replace all the fluid in an auto. trans. car by connecting to the cooling lines and running the car at idle until all fluid had been exchanged; took a minute or less. The reservoir with the new fluid in it had a sight window so he could monitor the exchange. I liked this approach. The only downside is the filter doesn't get changed, but if the old fluid looks clear may be able to get by without changing the filter. Each of these approaches has it's pros and cons
Every 50K, the trans filter should be replaced, the system power flushed, and fluid level checked in the ends.
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Old 08-22-2018, 01:20 AM
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Originally Posted by RobJoy View Post
Several years ago I watched a a service guy at a Valvoline (I think) quick-change oil station use a machine to completely replace all the fluid in an auto. trans. car by connecting to the cooling lines and running the car at idle until all fluid had been exchanged; took a minute or less. The reservoir with the new fluid in it had a sight window so he could monitor the exchange. I liked this approach. The only downside is the filter doesn't get changed, but if the old fluid looks clear may be able to get by without changing the filter. Each of these approaches has it's pros and cons
Be aware that the A6 is not a positive full flow to the cooler. That means not all the fluid is processed in the same manner as your engine coolant or your engine oil.
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