C7 7 speed transmission
Thread Starter
Cruising
Joined: Jun 2013
Posts: 12
Likes: 0
C7 7 speed transmission
MANUAL TRANSMISSION IS VERY DIFFICULT TO SHIFT INTO GEAR AT TIMES (especially first to second) AND IT ALSO LACKS A CRISPNESS that it should have. in my C5 and C6 vettes this occured only when the ending was cold and only from first to second. This was noted in the Tech bulletin but I have not seen any explanation or ways to fix it. Anyone else with the same issues?
Thanks, BobR
Thanks, BobR
Instructor
Joined: May 2019
Posts: 176
Likes: 74
MANUAL TRANSMISSION IS VERY DIFFICULT TO SHIFT INTO GEAR AT TIMES (especially first to second) AND IT ALSO LACKS A CRISPNESS that it should have. in my C5 and C6 vettes this occured only when the ending was cold and only from first to second. This was noted in the Tech bulletin but I have not seen any explanation or ways to fix it. Anyone else with the same issues?
Thanks, BobR
Thanks, BobR
Racer
Joined: Jul 2019
Posts: 388
Likes: 213
From: RI
Same issue here. Getting into second is the only gear I have had grind on me.
Only happens when cold, so only my first shift of the day as I drive away from home.
Now I make that shift very deliberate. Almost like the trans wants to pop out of 2nd and if I am still applying pressure... griiiind.
If the car is warmed up this is not an issue.
Only happens when cold, so only my first shift of the day as I drive away from home.
Now I make that shift very deliberate. Almost like the trans wants to pop out of 2nd and if I am still applying pressure... griiiind.
If the car is warmed up this is not an issue.
Safety Car
Joined: Jul 2018
Posts: 4,303
Likes: 2,055
From: Margate, FL
I have the problem going into first - hot or cold it will sometimes grind. I've gotten used to it, just takes firmer pressure to make sure 1st is fully selected. Changing fluid helped a tiny bit too. The biggest help was to put the car into first as its rolling to a stop. I think the drag on the shaft helps align the synros as it only grinds when I go from N (sitting in traffic, clutch out) to 1st. Granted this is not the same as the 1st to 2nd cold issue reported here but is related to the M7 so figured I'd share my experience anyway.
Instructor
Joined: Aug 2019
Posts: 175
Likes: 106
2025 C8 of the Year Finalist - Modified
Shifter linkage could be out of alignment. There is a TSB out there for it.
https://www.corvetteforum.com/forums...adjustment.pdf
https://www.corvetteforum.com/forums...adjustment.pdf
Last edited by jplake; Dec 4, 2019 at 09:08 PM.
Race Director
Joined: Mar 2001
Posts: 19,965
Likes: 6,770
From: Bonneville Salt Flats
"...VERY DIFFICULT TO SHIFT INTO GEAR AT TIMES" Nearly every manual I've had all my long life has been the same in this regard. Perhaps, my wife's '99 Miata Sport when new was the only exception I can think of off-hand. Yes, have the linkage checked and get a second opinion on your specific example, of course. All the best. 
Drifting
Joined: Nov 2019
Posts: 1,675
Likes: 872
From: Indian land SC
I’m having the exact same issue in the 2017 I just bought...headed to dealership for full inspection and to get engine cover coating issue resolved, I also told them about the issue getting in second and they said they would look...
curious if guys that installed a short shifter were able to resolve this
curious if guys that installed a short shifter were able to resolve this
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Safety Car
Joined: Jul 2018
Posts: 4,303
Likes: 2,055
From: Margate, FL
Last edited by JMII; Dec 5, 2019 at 11:56 AM.
Melting Slicks
Joined: Sep 2005
Posts: 2,568
Likes: 264
From: Near Charlotte NC
As far as I know,most Tremec's are like that to some extent.
A change of fluid might help.Mine ('17) was 1/2 qt low from the factory.
After a 1000 miles,it was fine.
\db2
A change of fluid might help.Mine ('17) was 1/2 qt low from the factory.
After a 1000 miles,it was fine.
\db2
Last edited by dbaker; Dec 5, 2019 at 01:10 PM.
Drifting
Joined: Dec 2019
Posts: 1,816
Likes: 616
From: Blacksburg Va
I did the Redline D4 fluid in mine (2019 base) a couple weeks ago. It definitely helped the cold 2nd gear problem. Didn't transform it, but now at least it feels like it will go in if I just pull for a little longer. So I do. It has made getting into first at a stop a little more positive also. It's not a Miata trans, it's not even as nice as my wife's 2015 Mustang GT, but it's better than it was.
