Auto transmission shift quality
Thread Starter
Drifting
Joined: Dec 2010
Posts: 1,939
Likes: 2
From: Danielsville Georgia
Auto transmission shift quality
Is there a flash updates for 2008 auto trans shift? Mine has at low speeds sometimes a confusion of what gear to be in. Like slowing,turning a corner and for a second wants a too high gear and starts to shift up and then downshifts down to the proper gear and such. Nothing serious but annoying. I'd love to get it 'tuned' but have warranty I don't want to jeopardize.
Race Director
Joined: Mar 2011
Posts: 13,262
Likes: 3,151
From: SW Florida
2021 C6 of the Year Finalist - Modified
Well, the L680 transmission in these late model Corvettes is really a pretty strong and dependable unit, but your right ... shift quality during normal driving is not great, and the tranny seems to always be hunting for a gear (you really never know what gear it's in).
I fixed all these problems with a Chuck CoW transmission tune on my 2011 GS (A6).
Made a real big difference, and I am happy.
Hope this don't turn into a "warranty thread" ... I know ... I know
I fixed all these problems with a Chuck CoW transmission tune on my 2011 GS (A6).
Made a real big difference, and I am happy.
Hope this don't turn into a "warranty thread" ... I know ... I know
Thread Starter
Drifting
Joined: Dec 2010
Posts: 1,939
Likes: 2
From: Danielsville Georgia
I love to have a engine,trans 'tune' but have factory power train and GMPP on the car. At this point I don't want to gamble that. Curious if any factory updates. I know I'll need to pick on a Chevy dealer ultimately. Just curious if any forum members know if there are any.
Pro
Joined: Sep 2007
Posts: 608
Likes: 21
From: Calgary AB
Yes, see my post in this thread
http://forums.corvetteforum.com/1579411498-post34.html
My understanding is 06-08 are pretty much the same. If it worked for my 06, it's probably applicable to your 08.
http://forums.corvetteforum.com/1579411498-post34.html
My understanding is 06-08 are pretty much the same. If it worked for my 06, it's probably applicable to your 08.
Team Owner
Joined: Dec 2003
Posts: 57,408
Likes: 164
From: queensbury ny
See CHUCK at CORVETTES OF WESTCHESTER,a forum vendor.He does upgrades and people seem to rave about the changes he makes.Other then that,buy a 2012 and GM made changes there while in sport mode.
Thread Starter
Drifting
Joined: Dec 2010
Posts: 1,939
Likes: 2
From: Danielsville Georgia
Maybe. Updates are usually incorporated in newer models. Either way I'll start bugging Chevy dealer. See if any one there knows how to search for flash updates. It is nice to know it was a big improvement on your 2006. My 2006 the low speed shifts were better then this 2008.
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Le Mans Master
Joined: Feb 2002
Posts: 5,394
Likes: 281
From: cumming ga
Is there a flash updates for 2008 auto trans shift? Mine has at low speeds sometimes a confusion of what gear to be in. Like slowing,turning a corner and for a second wants a too high gear and starts to shift up and then downshifts down to the proper gear and such. Nothing serious but annoying. I'd love to get it 'tuned' but have warranty I don't want to jeopardize.
z51vett
Team Owner
Joined: Dec 2003
Posts: 57,408
Likes: 164
From: queensbury ny
Maybe. Updates are usually incorporated in newer models. Either way I'll start bugging Chevy dealer. See if any one there knows how to search for flash updates. It is nice to know it was a big improvement on your 2006. My 2006 the low speed shifts were better then this 2008.
Racer
Joined: Jan 2012
Posts: 314
Likes: 64
Take a look at PIP 4395
http://forums.corvetteforum.com/c6-c...ip-4395-a.html
http://forums.corvetteforum.com/c6-c...ip-4395-a.html
Condition/Concern:
Some customers may comment on a flare or harsh 2-3 shift.
Recommendation/Instructions:
This condition may be caused by leaking 1-2-3-4 and 3-5-R clutch fluid seal rings (230). The following conditions are indications that the fluid seal rings may be leaking:
• Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts, that are more likely to occur when the transmission temperature is below approximately 40 degree C (104 degree F).
• Harsh or flaring 2-3 shifts that are more likely to occur when the transmission fluid temperature is in the approximately 0 degree C (32 degree F) to 40 degree C (104 degree F) temperature range, but can be present at any temperature.
• Harsh 2-3 shifts that are more likely to occur at less than 50% tp.
Vehicles built in the January through August, 2007 time frame are more likely to have leaking fluid seal rings
Important: When inspecting the 1-2-3-4 and 3-5-R clutch fluid seal rings (230) there probably will not be visible signs that the seal rings are damaged.
If any of the conditions above describe the flare/harsh 2-3 shift condition replace the 1-2-3-4 and 3-5-R clutch fluid seal rings (230), DO NOT replace the valve body or TCM.
Some customers may comment on a flare or harsh 2-3 shift.
Recommendation/Instructions:
This condition may be caused by leaking 1-2-3-4 and 3-5-R clutch fluid seal rings (230). The following conditions are indications that the fluid seal rings may be leaking:
• Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts, that are more likely to occur when the transmission temperature is below approximately 40 degree C (104 degree F).
• Harsh or flaring 2-3 shifts that are more likely to occur when the transmission fluid temperature is in the approximately 0 degree C (32 degree F) to 40 degree C (104 degree F) temperature range, but can be present at any temperature.
• Harsh 2-3 shifts that are more likely to occur at less than 50% tp.
Vehicles built in the January through August, 2007 time frame are more likely to have leaking fluid seal rings
Important: When inspecting the 1-2-3-4 and 3-5-R clutch fluid seal rings (230) there probably will not be visible signs that the seal rings are damaged.
If any of the conditions above describe the flare/harsh 2-3 shift condition replace the 1-2-3-4 and 3-5-R clutch fluid seal rings (230), DO NOT replace the valve body or TCM.
Thread Starter
Drifting
Joined: Dec 2010
Posts: 1,939
Likes: 2
From: Danielsville Georgia
Have no flare. No slow engagement. Found a TSB pertaining to low speed kinda confused shifting etc. It says Corvette,Cadillac and something else from 2006 to 2009 or such. Full page describing pretty well what mine does. Then at the bottom of the TSB it says NO REPAIR NEEDED. NORMAL OPERATION! BS! LOL. Wonder who does 'tuning' in greater Atlanta? vengeance racing?
Former Vendor
Joined: Nov 2005
Posts: 11,792
Likes: 255
From: Ossining New York
St. Jude Donor '07-'08-'09-'10-'12-'13-'14
Give me a call!
Well, the L680 transmission in these late model Corvettes is really a pretty strong and dependable unit, but your right ... shift quality during normal driving is not great, and the tranny seems to always be hunting for a gear (you really never know what gear it's in).
I fixed all these problems with a Chuck CoW transmission tune on my 2011 GS (A6).
Made a real big difference, and I am happy.
Hope this don't turn into a "warranty thread" ... I know ... I know
I fixed all these problems with a Chuck CoW transmission tune on my 2011 GS (A6).
Made a real big difference, and I am happy.
Hope this don't turn into a "warranty thread" ... I know ... I know
Give me a call!
Chuck CoW
Safety Car
Joined: Dec 2006
Posts: 4,642
Likes: 9
From: Dalllas/Ft Worth Area TX
May be simple!
Is there a flash updates for 2008 auto trans shift? Mine has at low speeds sometimes a confusion of what gear to be in. Like slowing,turning a corner and for a second wants a too high gear and starts to shift up and then downshifts down to the proper gear and such. Nothing serious but annoying. I'd love to get it 'tuned' but have warranty I don't want to jeopardize.
Have no flare. No slow engagement. Found a TSB pertaining to low speed kinda confused shifting etc. It says Corvette,Cadillac and something else from 2006 to 2009 or such. Full page describing pretty well what mine does. Then at the bottom of the TSB it says NO REPAIR NEEDED. NORMAL OPERATION! BS! LOL. Wonder who does 'tuning' in greater Atlanta? vengeance racing?
TIP: Get that fluid checked before you let any tuner mess with your transmission. Could be that simple!
Last edited by 2006c6keller; Mar 8, 2012 at 06:06 PM.
Life Time NCM #2196
Joined: Sep 2004
Posts: 82,605
Likes: 1,722
From: Converse TX
Like my tune, going to the track next week and then a review of your tune I got in Houston, and I will have about 1k of seat time then
