Triple Flush
Melting Slicks
Joined: Dec 2004
Posts: 3,244
Likes: 562
From: Margaritaville Daytona
A good video that steps through the change/fill/level check is at..
https://youtu.be/dPrP4NQZg6w
He covers the fill adaptor at 21:45 in to the video.
The fill adaptor is not needed, but it does eliminate the need to uncover the fill cover that is sometimes hard to get to. The fill adaptor allows easy fill through the drain plug hole.
https://youtu.be/dPrP4NQZg6w
He covers the fill adaptor at 21:45 in to the video.
The fill adaptor is not needed, but it does eliminate the need to uncover the fill cover that is sometimes hard to get to. The fill adaptor allows easy fill through the drain plug hole.
thanks, excellent instructor and instructions. Can I safely assume that to drain and replace all fluid you must drop the pan? Then disconnect an external tube too a cooler and blow air to flush the system?
Upon refilling, overfill cold to the recommend fill amount then perform this video directions for adjusting properly? Overfilling doesn’t seem to be a problem.
Race Director
Joined: Oct 2008
Posts: 16,644
Likes: 7,717
From: NJ
As much as I know he knows everything 10000 times what I know the TSB itself came out I believe in December 2016. That leads me to believe the fluid didn't hit the line until somewhere around that time frame meanwhile 2017 production was well under way already. So at the earliest it's 2017 production and probably the latest right after the TSB which would mean January February 2017 I my guesstimation
Advanced
Joined: Jul 2010
Posts: 83
Likes: 56
Yep,, Drain what you can through the level check port with engine off, drop the pan as typical, count the quarts, put about 1/2 qt more than that back in, then carefully do the level check procedure. The 3 bolts at the rear of the pan are the most difficult to reach. Do those first, then the others are straightforward. As the procedure says, with proper level check conditions, if nothing comes out the level check plug, put in another 1/4 qt or so and try again.
Among other things, engine must be running and tranny within proper temp range for the level check part. I presume as well that overfilling for the level check is not a problem, but driving when overfilled is something that is just not good.
I did not do the cooler flush, though you could do that to get a bit more fluid out. As I mentioned, I plan on another round of fluid change sometime to get a better change-out of old fluid.
Very roughly, the tranny holds about 12qts, and you get about 7-8 qts out with just dropping the pan. For a rough estimate - One change - about 40% old fluid remains, two changes about 16%, 3 changes about 6%. GM stopped at 3 when they started the TSB but has backed off to 1. Ratios are slightly better with the cooler flush included.
Among other things, engine must be running and tranny within proper temp range for the level check part. I presume as well that overfilling for the level check is not a problem, but driving when overfilled is something that is just not good.
I did not do the cooler flush, though you could do that to get a bit more fluid out. As I mentioned, I plan on another round of fluid change sometime to get a better change-out of old fluid.
Very roughly, the tranny holds about 12qts, and you get about 7-8 qts out with just dropping the pan. For a rough estimate - One change - about 40% old fluid remains, two changes about 16%, 3 changes about 6%. GM stopped at 3 when they started the TSB but has backed off to 1. Ratios are slightly better with the cooler flush included.
Last edited by kensredvette2; Sep 22, 2018 at 12:04 AM.
Safety Car
Joined: Nov 2007
Posts: 4,446
Likes: 313
From: Tarpon Springs FL
FL Events Coordinator
The Torque Converter is part of the GM power train 5 year warranty . If you have what you believe to be TC symptoms such as the feeling of driving over rumble strips there is a protocol that the service department must follow :
1) a tech will hook up his computer to your car and while doing a road test will measure Torque Converter Clutch slip and other parameters to confirm they are either in or out of tolerance.,
2) If out of tolerance they will do the flush procedure or go straight to a TC replacement which includes the new transmission fluid that became available very late 2016 or Jan 2017.
I see that you are probably in Florida for the winter as am I . Stingray Chevrolet in Plant City FL is one of the nations largest Corvette dealers. You can call them for verification of your concerns and warranty by speaking with Justin Lawson who is the Director of Maintenance and has a great deal of experience with these issues.For TC issues , differential issues etc, I would STRONGLY recommend you only deal with a large Corvette dealership.
.
1) a tech will hook up his computer to your car and while doing a road test will measure Torque Converter Clutch slip and other parameters to confirm they are either in or out of tolerance.,
2) If out of tolerance they will do the flush procedure or go straight to a TC replacement which includes the new transmission fluid that became available very late 2016 or Jan 2017.
I see that you are probably in Florida for the winter as am I . Stingray Chevrolet in Plant City FL is one of the nations largest Corvette dealers. You can call them for verification of your concerns and warranty by speaking with Justin Lawson who is the Director of Maintenance and has a great deal of experience with these issues.For TC issues , differential issues etc, I would STRONGLY recommend you only deal with a large Corvette dealership.
.
Le Mans Master
Joined: Aug 2015
Posts: 8,243
Likes: 4,617
From: Southwest Florida
Yep,, Drain what you can through the level check port with engine off, drop the pan as typical, count the quarts, put about 1/2 qt more than that back in, then carefully do the level check procedure. The 3 bolts at the rear of the pan are the most difficult to reach. Do those first, then the others are straightforward. As the procedure says, with proper level check conditions, if nothing comes out the level check plug, put in another 1/4 qt or so and try again.
Among other things, engine must be running and tranny within proper temp range for the level check part. I presume as well that overfilling for the level check is not a problem, but driving when overfilled is something that is just not good.
I did not do the cooler flush, though you could do that to get a bit more fluid out. As I mentioned, I plan on another round of fluid change sometime to get a better change-out of old fluid.
Very roughly, the tranny holds about 12qts, and you get about 7-8 qts out with just dropping the pan. For a rough estimate - One change - about 40% old fluid remains, two changes about 16%, 3 changes about 6%. GM stopped at 3 when they started the TSB but has backed off to 1. Ratios are slightly better with the cooler flush included.
Among other things, engine must be running and tranny within proper temp range for the level check part. I presume as well that overfilling for the level check is not a problem, but driving when overfilled is something that is just not good.
I did not do the cooler flush, though you could do that to get a bit more fluid out. As I mentioned, I plan on another round of fluid change sometime to get a better change-out of old fluid.
Very roughly, the tranny holds about 12qts, and you get about 7-8 qts out with just dropping the pan. For a rough estimate - One change - about 40% old fluid remains, two changes about 16%, 3 changes about 6%. GM stopped at 3 when they started the TSB but has backed off to 1. Ratios are slightly better with the cooler flush included.
Le Mans Master
Joined: May 1999
Posts: 6,515
Likes: 1,302
From: Windermere FL
In that video, he mentions it is difficult to get to the fill tube on Camero's as the exhaust and cooler tubes are in the way. How hard is it to remove the filler cap on A8 Z51? I am thinking I can use my Mityvac fluid extraction machine and insert a tube into the pan and suck out most the fluid avoiding dropping the pan. Then run it for a while, and rinse and repeat 3 times. I'll know exactly how much fluid I got out since it will all be in the Mityvac and I won't be taking a bath in it like I typically do when dropping the pan.
Last edited by Flame Red; Sep 22, 2018 at 07:02 PM.
Le Mans Master
Joined: Sep 2012
Posts: 7,146
Likes: 1,940
From: Hagerstown MD
St. Jude Donor '15-'16,'18
Dealer just called. My car is ready to be picked up. Was in the shop for 10 days. They had to order the trans filter and fluid. Triple flush performed. Svc mgr said to drive it for a while and if the shudder returns they will replace the totque converter, again. I had a new TC installed in December 2016 at 22k miles. Now have 21k miles.
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6th Gear
Joined: Nov 2009
Posts: 6
Likes: 2
Live in FL and bought a used, 18K mile, 2015 LT2 with added goodies coupe from a Cadillac dealer. Noticed the rumble almost immediately, returned with a copy of the then active TSB...they did a tranny flush (or claimed they did). Problem remained, so I took it to a local Chevy dealer. They did another flush, said the Cadillac dealership never dropped the pan and therefore didn't change the transmission filter, so the Caddy flush was questionable.. Rumble was greatly reduced, but not entirely gone. They did another flush. Rumble comes and goes, but hard to tell since it's only a weekend driver. Their diagnostic test, (PICA ?) showed it was still out of spec. Latest info I got from them is that GM is no longer replacing the TC and is in a quandary on what to do, so TC replacement is on hold for now. Another TSB will be issued in the first quarter of 2019. I'm writing this on 12/3/2018. Hope this helps some of you...as for me I'm thinking of selling it B4 it hits 20K miles.
