HELP! problems with A6 transmission
Thread Starter
4th Gear
Joined: Dec 2023
Posts: 4
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HELP! problems with A6 transmission
Hello, I am new to the forums and I would greatly appreciate some help.
My 2014 C7 with the automatic 6 speed transmission has had issues ever since I bought the car used. Firstly when shifting from Park to any gear it takes a few seconds for the car to actually engage. Typically with a noticeable jerk. What puzzles me more is the fact that for a few moments when the car is ice cold it will not have this issue and shifts quickly and with no jolt.
Secondly, it has a hard shift from first into second that will give you a fairly large jolt. It is quite annoying and doesn't feel good.
Third is a tiny yet annoying rattle when cruising in V4 mode. Sounds like a ticking in the front or back of the car. If you give it gas or switch it back to v8 mode the sound goes away. I'm fairly certain it's an issue with the torque tube which i plan to rebuild here soon.
Any help with such issues, ideas with what's wrong/ stuff to fix is greatly appreciated. I'm able to work on the car myself as I have a car lift and I have been a mechanic for a couple years now. I know the basics.
My 2014 C7 with the automatic 6 speed transmission has had issues ever since I bought the car used. Firstly when shifting from Park to any gear it takes a few seconds for the car to actually engage. Typically with a noticeable jerk. What puzzles me more is the fact that for a few moments when the car is ice cold it will not have this issue and shifts quickly and with no jolt.
Secondly, it has a hard shift from first into second that will give you a fairly large jolt. It is quite annoying and doesn't feel good.
Third is a tiny yet annoying rattle when cruising in V4 mode. Sounds like a ticking in the front or back of the car. If you give it gas or switch it back to v8 mode the sound goes away. I'm fairly certain it's an issue with the torque tube which i plan to rebuild here soon.
Any help with such issues, ideas with what's wrong/ stuff to fix is greatly appreciated. I'm able to work on the car myself as I have a car lift and I have been a mechanic for a couple years now. I know the basics.
Burning Brakes
Joined: Jun 2019
Posts: 1,212
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From: Georgetown, Tx
I have the same transmission in another GM vehicle that is in your 2014. Mine has acted up like you describe and my remedy was a transmission flush with fluid and filter change. It made a big difference.
V4 mode sets up a weird harmonic in the driveline. Others have described noises while in V4 mode. You can fix the rattle in V4 by not allowing it to go into V4 mode. Install one of the V4 disable modules and be done with it.
The torque tube removal is a big job. My thought is to not remove it unless absolutely necessary.
V4 mode sets up a weird harmonic in the driveline. Others have described noises while in V4 mode. You can fix the rattle in V4 by not allowing it to go into V4 mode. Install one of the V4 disable modules and be done with it.
The torque tube removal is a big job. My thought is to not remove it unless absolutely necessary.
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Best of luck finding the source of the issues you mention and then getting them fixed.
If you want to keep the car out of V4 mode, install a Range AFM eliminator and have no worries about it again.
If you want to keep the car out of V4 mode, install a Range AFM eliminator and have no worries about it again.
Pro
Joined: May 2022
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From: Peoria, Arizona
I have the same tranny but I was going to suggest a fluid change. I can't help you further with that. I WILL HIGHLY SUGGEST you get rid of V4 mode forever. Straight out of a corvette engineers mouth is that it creates bad vibrations through the drivetrain. It's on youtube. Get a range device or get it removed through a tune. Or drive in manual mode 100% of the time. You want to stay out of V4 mode.
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Le Mans Master
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This is where people go to solve issues. EVERY car has issues. Go to the Toyota forum. These cars are also ran very hard and this also creates issues.
Yes, we do love our cars. I like the blue color.
Yes, we do love our cars. I like the blue color.
Last edited by kodpkd; Aug 26, 2025 at 01:25 PM.
Thread Starter
4th Gear
Joined: Dec 2023
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took off trans pan, replaced gasket and filter, dropped the car down filled it. Put it on a level surface. Brought the trans up to 100°f and pulled the plug on the bottom of the trans until there was only a steady drip coming out of the pan. That's exactly how I did it
Le Mans Master
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This was with the engine running in park? Approximately 6 qt's to fill trans?
That is correct. I just did mine. I was hoping it was a simple fluid issue. You made sure you used the rare super snake oil? Just kidding.
That is correct. I just did mine. I was hoping it was a simple fluid issue. You made sure you used the rare super snake oil? Just kidding.
Last edited by kodpkd; Dec 17, 2023 at 09:15 PM.
Le Mans Master
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From: Atlanta GA
Before you start shoot a parts cannon at it , have a clear adapts and a garage relearn procedure done by someone who knows howbto donit ... usually cures all shifting concerns and maybe that clicking sound ..
Dave
Dave
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I have the same tranny but I was going to suggest a fluid change. I can't help you further with that. I WILL HIGHLY SUGGEST you get rid of V4 mode forever. Straight out of a corvette engineers mouth is that it creates bad vibrations through the drivetrain. It's on youtube. Get a range device or get it removed through a tune. Or drive in manual mode 100% of the time. You want to stay out of V4 mode.
I would not remove the torque tube, that is a big job & what you probably hear is the V4 sound resonating through the car, try the range device & see if the noise goes away
Thread Starter
4th Gear
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2nd Gear
Joined: Feb 2025
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Active Fuel Management System AFM
Hello, I am new to the forums and I would greatly appreciate some help.
My 2014 C7 with the automatic 6 speed transmission has had issues ever since I bought the car used. Firstly when shifting from Park to any gear it takes a few seconds for the car to actually engage. Typically with a noticeable jerk. What puzzles me more is the fact that for a few moments when the car is ice cold it will not have this issue and shifts quickly and with no jolt.
Secondly, it has a hard shift from first into second that will give you a fairly large jolt. It is quite annoying and doesn't feel good.
Third is a tiny yet annoying rattle when cruising in V4 mode. Sounds like a ticking in the front or back of the car. If you give it gas or switch it back to v8 mode the sound goes away. I'm fairly certain it's an issue with the torque tube which i plan to rebuild here soon.
Any help with such issues, ideas with what's wrong/ stuff to fix is greatly appreciated. I'm able to work on the car myself as I have a car lift and I have been a mechanic for a couple years now. I know the basics.
My 2014 C7 with the automatic 6 speed transmission has had issues ever since I bought the car used. Firstly when shifting from Park to any gear it takes a few seconds for the car to actually engage. Typically with a noticeable jerk. What puzzles me more is the fact that for a few moments when the car is ice cold it will not have this issue and shifts quickly and with no jolt.
Secondly, it has a hard shift from first into second that will give you a fairly large jolt. It is quite annoying and doesn't feel good.
Third is a tiny yet annoying rattle when cruising in V4 mode. Sounds like a ticking in the front or back of the car. If you give it gas or switch it back to v8 mode the sound goes away. I'm fairly certain it's an issue with the torque tube which i plan to rebuild here soon.
Any help with such issues, ideas with what's wrong/ stuff to fix is greatly appreciated. I'm able to work on the car myself as I have a car lift and I have been a mechanic for a couple years now. I know the basics.