Wacky Transmission - Chevy Impala Forums
9th Gen Drivetrain Transmissions, Clutches and Axles.

User Tag List

 2Likes
  • 1 Post By MadMatter
  • 1 Post By 12 lt
 
LinkBack Thread Tools Display Modes
post #1 of (permalink) Old 05-02-2019 Thread Starter
Junior Member
 
MadMatter's Avatar
 
Join Date: Aug 2011
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Garage
Wacky Transmission

After reading some of the forum threads, I'd say Impala transmissions are garbage!

1. I have a 2015 with 69,500 miles. The power train warranty ends in 3 months (August). Problems and odd behaviors are listed below. I would very much appreciate any advice on how to get any of this fixed before the warranty ends.

2. The second gear starts at an rpm that is almost the same as the end rpm of the first gear. Could something be wrong with the torque converter, or is it by design? I read in the owners manual that the second gear can be used instead of the first gear while using manual, when the car is accelerated from a stop. The feature is to be used when traction is very poor, reducing spinout.

3. The second gear is often used for a mere two seconds while accelerating slowly!

4. While shifting from 2nd to 3rd, the engine sometimes revs up between gears, delaying the shift considerably. This used to happen all the time until I discovered (much thanks to this forum) that my intake tube was severely cracked. After I installed a new intake tube, the revving between gears decreased considerably. The noise, power, and fuel efficiency also decreased noticeably.

5. While in 3rd gear, the rpms drop a single time while the car is accelerating. Again, I'm wondering if there's a problem with the torque converter.

6. The car shudders when the rpm is below 1500, while going up a hill. This happens in drive or manual mode. It is somewhat noticeable in 4th gear and is very noticeable in 5th and 6th. I took the car to the dealer to have some things checked before the warranty was up. I drove the car with the mechanic in it and showed him what happens. He noticed it but said "I don't know".

We put some very thick silicone lube where the throttle body meets the new intake tube, and where the EGR tube meets the intake tube. We did this to create a seal, but im worried we created a problem.

7. From a cold start the rpms are all over the place until it settles down. Up down up down.

8. I noticed a very small amount of black goo at the top of the transmission dipstick opening. Pretty sure it was dirt from the outside of the opening. Does it need a flush?Thanks for reading, and for any responses.
VladThe likes this.
MadMatter is offline  
Sponsored Links
Advertisement
 
post #2 of (permalink) Old 05-02-2019
Senior Member
 
12 lt's Avatar
 
Join Date: Feb 2017
Posts: 1,044
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 237 Post(s)
Thanks: 73
Thanked 85 Times in 80 Posts
Garage
Quote:
Originally Posted by MadMatter View Post
After reading some of the forum threads, I'd say Impala transmissions are garbage!
Your opinion, sure some might agree with you, while many would likely not. Personally, been fairly pleased with the transmission in our 12 lt with a 3.6 and 6 speed.

Quote:
Originally Posted by MadMatter View Post
1. I have a 2015 with 69,500 miles. The power train warranty ends in 3 months (August). Problems and odd behaviors are listed below. I would very much appreciate any advice on how to get any of this fixed before the warranty ends.
If you know the warranty is running out and you need to get it taken care of, would be in to a dealer asap. Be sure you explain all of what you post here and be sure you get in writing what they do to evaluate your car. If the dealer finds nothing wrong, go to another, then if still nothing found call chevy directly and complain.

Quote:
Originally Posted by MadMatter View Post
2. The second gear starts at an rpm that is almost the same as the end rpm of the first gear. Could something be wrong with the torque converter, or is it by design? I read in the owners manual that the second gear can be used instead of the first gear while using manual, when the car is accelerated from a stop. The feature is to be used when traction is very poor, reducing spinout.

3. The second gear is often used for a mere two seconds while accelerating slowly!

4. While shifting from 2nd to 3rd, the engine sometimes revs up between gears, delaying the shift considerably. This used to happen all the time until I discovered (much thanks to this forum) that my intake tube was severely cracked. After I installed a new intake tube, the revving between gears decreased considerably. The noise, power, and fuel efficiency also decreased noticeably.

5. While in 3rd gear, the rpms drop a single time while the car is accelerating. Again, I'm wondering if there's a problem with the torque converter.

6. The car shudders when the rpm is below 1500, while going up a hill. This happens in drive or manual mode. It is somewhat noticeable in 4th gear and is very noticeable in 5th and 6th. I took the car to the dealer to have some things checked before the warranty was up. I drove the car with the mechanic in it and showed him what happens. He noticed it but said "I don't know".

We put some very thick silicone lube where the throttle body meets the new intake tube, and where the EGR tube meets the intake tube. We did this to create a seal, but im worried we created a problem.
Not too sure what to say about all of that other than to be sure to give that information to your dealer. Assuming your car has the 3.6 and 6 speed. In my opinion the 6 speed is a solid transmission.

Quote:
Originally Posted by MadMatter View Post
7. From a cold start the rpms are all over the place until it settles down. Up down up down.
A cold start and erratic rpms is not necessarily uncommon and should have nothing to do with the transmission, unless you try to cram it in drive while the rpms are still too high.

Quote:
Originally Posted by MadMatter View Post
8. I noticed a very small amount of black goo at the top of the transmission dipstick opening. Pretty sure it was dirt from the outside of the opening. Does it need a flush?Thanks for reading, and for any responses.
Not sure the best route to clean the goo without having any contamination. If the goo is more gelled or liquified might be able to wipe it out. These transmissions are not supposed to be flushed, a drain and change service is suggested I believe at 97,500 for regular service, earlier for taxi, police, and fleet service. Some perform the drain and change earlier than the schedule calls for. With 162000 plus miles on our 2012 model I have drained and changed the dex 6 in our car I think 4 times now.

Think how these transmission hold up depends on how they are treated. As to the sometimes "funky" shifting noted by some, seems that some tune's eliminated those shifting issues. Found it interesting that one poster here posted/complained how he had to fork out some cash for a rebuild and complained about other issues as well, but then in another thread went on to say something about "going Dukes of Hazzard" in his car.
ICUBB likes this.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
12 lt is offline  
post #3 of (permalink) Old 05-03-2019
Member
 
VladThe's Avatar
 
Join Date: Dec 2018
Posts: 51
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Thanks: 1
Thanked 2 Times in 2 Posts
Garage
General transmission weirdness compared to other vehicles seems to be very common (as you noticed from a lot of posts on this board). I regularly get a feeling something is wrong with my car's transmission, but I have a certified used warranty on the drivetrain for 3 more years.
I have pretty much resigned myself to write off most transmission weirdness as being unique to the control module settings GM has done for Impalas or being unique issues with the transmission itself. Unless some new information shows up on this forum or some new symptom develops on my own car, I am just going to go with the flow for the time being.
I do wonder about your transmission dipstick goo comment. I thought all the newer Impala transmissions are sealed and do not have a dipstick. Personally, I hate not having a way to easily check the level, nor even check the color of my transmission fluid.

Adding a singature only because I am tired of being shown my incomplete account setup.
VladThe is offline  
Sponsored Links
Advertisement
 
post #4 of (permalink) Old 05-03-2019
Senior Member
 
12 lt's Avatar
 
Join Date: Feb 2017
Posts: 1,044
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 237 Post(s)
Thanks: 73
Thanked 85 Times in 80 Posts
Garage
Quote:
Originally Posted by VladThe View Post
I do wonder about your transmission dipstick goo comment. I thought all the newer Impala transmissions are sealed and do not have a dipstick. Personally, I hate not having a way to easily check the level, nor even check the color of my transmission fluid.
Cannot speak for the 9th gen new body style, but the 8th gen 6 speeds with the 3.6 lfx engine do in fact have a trans dipstick/filler. It is suggested the transmission be drained and refilled as per svc schedule in your manuals maintenance schedule. Would encourage anyone who does not know if they have a trans dipstick to check your owners manual. Check fluid level and color after the car is warm and has been run through the gears.

My 6 year constantly asks why. What adults can learn from 5 and 6 year olds, to listen with your ears and mind open. Hard to learn when you don't listen ......
12 lt is offline  
post #5 of (permalink) Old 05-04-2019 Thread Starter
Junior Member
 
MadMatter's Avatar
 
Join Date: Aug 2011
Posts: 6
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
Garage
Thanks for the responses. I'll go to a different dealer and let them know of the problems, and consider a flush.
MadMatter is offline  
post #6 of (permalink) Old 07-22-2019
Member
 
VladThe's Avatar
 
Join Date: Dec 2018
Posts: 51
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 19 Post(s)
Thanks: 1
Thanked 2 Times in 2 Posts
Garage
Not a sealed transmission

OK, I just realized that I actually do not have a sealed transmission. The owners manual says the following about the transmission,
"There is a special procedure for
checking and changing the
transmission fluid. Because this
procedure is difficult, you should
have this done at your dealer."

I took this to mean I had a sealed transmission, because why would they say this if it is just the usual cap with a built in dipstick? So this weekend I took off the transmission fill cap for the first time since I bought the car 15 months ago and sure enough, there was the transmission dip stick. I guess this proves the old saying about assuming stuff.

Fluid color looked OK and looked to be at an OK level. But my car also has a lot of noticeable weird shifts, especially at lower speeds. I don't want to risk voiding the drivetrain warranty with a tune, so I guess I will just have to accept that this GM tranmsision is set up funky and just deal with the weirdness.

Adding a singature only because I am tired of being shown my incomplete account setup.
VladThe is offline  
post #7 of (permalink) Old 07-22-2019
Member
 
rjayl's Avatar
 
Join Date: Nov 2018
Location: MI
Posts: 90
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 28 Post(s)
Thanks: 2
Thanked 2 Times in 2 Posts
Quote:
o I guess I will just have to accept that this GM tranmsision is set up funky and just deal with the weirdness
Umm no. Most weirdness in transmissions can be accredited with a lack of maintenance. Change the fluid, its not that difficult.
rjayl is online now  
post #8 of (permalink) Old 4 Weeks Ago
Junior Member
 
Ltzimpala14's Avatar
 
Join Date: Jul 2019
Posts: 9
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 0
Thanked 0 Times in 0 Posts
I’m having some of the same issues you are having. So what I have gathered is that the Impalas are great cars but in 2014 they changed the whole transmission design mid 2014 or so. This is why there are the Impala Limited (pre) and the new style after the change. New design, new transmission completely. Some mechanics say it was built this way. You may have known this but this is just the explanation I’ve received a few times. I’m really not sure and am searching for help as well. I was thinking since the tube was cracked maybe dirt etc... was sucked in so I was thinking on cleaning the MAF sensor or replacing if it has to be since it’s a closed unit. Also changing the air filters. I’m against the wall as well. Thanks for mentioning the intake tube, mine was cracked as well. Found that on accident, expensive little part. I’m not really finding much at all on my 2014, not even a repair manuel. Any luck on one for yours? But I’ll post something if I hear anything that will help. I believe I posted mine on the wrong section of this but it’s in the 9th generation I believe. Thanks for your post
Ltzimpala14 is offline  
Sponsored Links
Advertisement
 
Reply

Related Threads
Thread Thread Starter Forum Replies Last Post
Transmission trouble rocks911 9th Gen Drivetrain 3 04-22-2019 04:17 AM
TH400 Transmission Refresh DesertXL Chevy Caprice 2 04-11-2019 06:56 AM
3.6 lfx power loss cyrus_the_great Chevy Impala 8th Gen Discussion 2 02-06-2019 09:26 AM
Transmission life expectancy Z71 8th Gen Drivetrain 11 05-31-2018 01:05 PM
Will a 09 transmission work in a 06 jso2378 Chevy Impala 8th Gen Discussion 1 11-10-2017 12:42 PM


Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Chevy Impala Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome