A-8 Question
Thread Starter
Instructor
Joined: Mar 2022
Posts: 145
Likes: 80
From: Western Arizona
A-8 Question
So I am finishing up the A-8 flush job. Pretty straightforward with a couple of store bought tools. I think I remember reading (somewhere) that I should have the trans software updated by the Dealer? A clutch alignment process? Any help from the Pro's would be appreciated! dr.k.
Roadster Madness. 😠
Joined: Sep 2009
Posts: 6,289
Likes: 2,356
From: Ventura Co Ca
SoCal Regional Events Coordinator
St. Jude Donor '13, '20-'21
I am not sure what the Dealer did when they did the upgrade, except fluid replacement, I just know it worked great after they did it! 
Pro
Joined: Jul 2021
Posts: 615
Likes: 310
From: CA
So I am finishing up the A-8 flush job. Pretty straightforward with a couple of store bought tools. I think I remember reading (somewhere) that I should have the trans software updated by the Dealer? A clutch alignment process? Any help from the Pro's would be appreciated! dr.k.
Melting Slicks
Joined: Aug 2017
Posts: 2,193
Likes: 2,203
From: Massachusetts
I used a cheap pump off Ebay to suck out the fluid from the passenger side plug. And pumped in new fluid.
I drove about 400 miles and did it a second time. I never had the shudder before or after. Now around 19k miles.
I will probably do it again next year just for insurance sakes.
I know I wasn't able to get it all out, cooling lines and torque converter.
I drove about 400 miles and did it a second time. I never had the shudder before or after. Now around 19k miles.
I will probably do it again next year just for insurance sakes.
I know I wasn't able to get it all out, cooling lines and torque converter.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
Yep, personally I'd leave the triple-flush to a trusted Chevy dealer considering the severity of the shudder issues and the vast success experienced by so many with dealers preforming the process. Plus, it's covered under warranty in most cases.
Thread Starter
Instructor
Joined: Mar 2022
Posts: 145
Likes: 80
From: Western Arizona
I used a Kent-Moore tool that bolts on in place of the trans cooler lines.This allows the removal of all of the internal oil.
I used a low pressure air hose to blow out the cooler and lines, almost 2qts.
I removed the pan and welded on a bung that allows me to drain the system without removing it.
I used the Chevy procedures as for as adding fluid, starting the engine to remove to old oil and then adding fresh ATF.
16qts flushed through the system. Then I dropped the pan for the last time and replaced the filter, adding around 8 - 10 qts. to get it full hot.
I was lucky, my car didn't ever shudder, but I was taking no chances. Being the 3rd. owner all of the fluids have been replaced.
I used a low pressure air hose to blow out the cooler and lines, almost 2qts.
I removed the pan and welded on a bung that allows me to drain the system without removing it.
I used the Chevy procedures as for as adding fluid, starting the engine to remove to old oil and then adding fresh ATF.
16qts flushed through the system. Then I dropped the pan for the last time and replaced the filter, adding around 8 - 10 qts. to get it full hot.
I was lucky, my car didn't ever shudder, but I was taking no chances. Being the 3rd. owner all of the fluids have been replaced.
Melting Slicks
Joined: Aug 2017
Posts: 2,193
Likes: 2,203
From: Massachusetts
Dr.K.1, well done. I wish you lived in driving distance!
Is this the adapters you used?
Kent-Moore Line Flush Adapters
Is this the adapters you used?
Kent-Moore Line Flush Adapters
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Instructor
Joined: Jul 2019
Posts: 190
Likes: 84
From: Tucson AZ
I had mine done at a Chevy dealer and they did not do a complete job as the TSB suggested. I still had a slight shutter and I removed the pan myself and the fluid was not completely changed nor was the pan cleaned. After I did the triple flush all is well. I suspect they only removed 5-6 quarts. How ever they did it, they did an incomplete job. Make sure they drop the pan 3 times as required by the TSB do the complete service.
Race Director
Joined: Apr 2017
Posts: 13,602
Likes: 12,864
From: Virginia
I had mine done at a Chevy dealer and they did not do a complete job as the TSB suggested. I still had a slight shutter and I removed the pan myself and the fluid was not completely changed nor was the pan cleaned. After I did the triple flush all is well. I suspect they only removed 5-6 quarts. How ever they did it, they did an incomplete job. Make sure they drop the pan 3 times as required by the TSB do the complete service.
Any quality and fairly busy Chevy service department have most likely done a couple hundred of these by now as it pertains to most all A8s, not just Corvettes.
Le Mans Master
Joined: Dec 2000
Posts: 5,348
Likes: 3,319
Not only have they performed dozens of the flushes, they also can test drive the car and tell you if your car is exhibiting systems as they know the problem well (yes, one is entitled to the flush on only your complaint, but it is great to know for sure what is going on).
Thread Starter
Instructor
Joined: Mar 2022
Posts: 145
Likes: 80
From: Western Arizona
Not that set. This is a block that bolts to the drivers side of the trans taking the place of the cooling lines. The forward / output port has a hose on it to drain into a graduated bucket so you know how much fluid is being removed to shut the car off. Really, really tight spot to make this stuff work. I'm sure that is why Chevrolet changed the procedure to the pan draining. I just wanted all of the old oil out to I put up with the hassle. I will look for the thread where a purchased to tool if you want.
Thread Starter
Instructor
Joined: Mar 2022
Posts: 145
Likes: 80
From: Western Arizona
Le Mans Master
Joined: Oct 2014
Posts: 8,672
Likes: 2,726
From: Atlanta GA
I used a Kent-Moore tool that bolts on in place of the trans cooler lines.This allows the removal of all of the internal oil.
I used a low pressure air hose to blow out the cooler and lines, almost 2qts.
I removed the pan and welded on a bung that allows me to drain the system without removing it.
I used the Chevy procedures as for as adding fluid, starting the engine to remove to old oil and then adding fresh ATF.
16qts flushed through the system. Then I dropped the pan for the last time and replaced the filter, adding around 8 - 10 qts. to get it full hot.
I was lucky, my car didn't ever shudder, but I was taking no chances. Being the 3rd. owner all of the fluids have been replaced.
I used a low pressure air hose to blow out the cooler and lines, almost 2qts.
I removed the pan and welded on a bung that allows me to drain the system without removing it.
I used the Chevy procedures as for as adding fluid, starting the engine to remove to old oil and then adding fresh ATF.
16qts flushed through the system. Then I dropped the pan for the last time and replaced the filter, adding around 8 - 10 qts. to get it full hot.
I was lucky, my car didn't ever shudder, but I was taking no chances. Being the 3rd. owner all of the fluids have been replaced.
Only do a transmission relearn procedure if you are experiencing sloppy shifts
Since you do not have either problem and you changed the fluid don't tempt fate .... if it ain't broke dont try and fix it as you could very easily brick your TCM if you dont know what you are doing
Dave