Hard Going into Gear when cCold
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Le Mans Master
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From: Palm Harbor not far from Sebring Florida
St. Jude Donor '11
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Hard Going into Gear when cCold
Whenever the car is cold (first thing in the morning) and I put it in gear to back out of the garage it takes a few seconds, and it seems rough when it engages and then once out and, on the street, again it is a hard slam as it engages. Once it is warmed up it seems fine. Any ideas. It is an A8 in case it was not clear.
Last edited by BWF07; May 6, 2026 at 05:46 PM.
Melting Slicks
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St. Jude Donor '25
Auto or manual?
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IIRC this is a valve body issue.
Do a search for valve body...
See this thread and the link in Post #5:
https://www.corvetteforum.com/forums...sion-cold.html
Ron
Do a search for valve body...
See this thread and the link in Post #5:
https://www.corvetteforum.com/forums...sion-cold.html
Ron
Last edited by RonC7; May 6, 2026 at 09:28 PM.
Melting Slicks
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St. Jude Donor '25
My A8 was hard to shift into gears on a cold start, I just did a triple flush per the TSB and it is like a brand new transmission.
Do you know if yours had the triple flush?
Do you know if yours had the triple flush?
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Do a search on the A8 transmission triple flush using the search feature on this forum
Melting Slicks
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From: North Texas
Even with the triple flush, 1 - 2nd is still a hard shift on my 17 A8.
Read it was a ATF 'drain back' issue but after the first shift all was normal.
Not worth tearing the car apart to fix a one time start up small irritating issue.
I believe GM's fix was to install a check valve (ball bearing) to stop the ATF fluid from draining back.
So after starting the car I just manually shift the trans in and out of 2nd gear a couple of times before driving away and it shifts normal from then on.
Read it was a ATF 'drain back' issue but after the first shift all was normal.
Not worth tearing the car apart to fix a one time start up small irritating issue.
I believe GM's fix was to install a check valve (ball bearing) to stop the ATF fluid from draining back.
So after starting the car I just manually shift the trans in and out of 2nd gear a couple of times before driving away and it shifts normal from then on.
6th Gear
Joined: Sep 2024
Posts: 6
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Whenever the car is cold (first thing in the morning) and I put it in gear to back out of the garage it takes a few seconds, and it seems rough when it engages and then once out and, on the street, again it is a hard slam as it engages. Once it is warmed up it seems fine. Any ideas. It is an A8 in case it was not clear.
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