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.
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.
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.
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.
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.