Well because when I changed my fluid my gears started slipping at 1st and 2nd gear too. But I used Valvoline instead of Matic S so it messed up my transmission and now its in the shop. I only used Valvoline because it said it was compatible but long story short; I learned my lesson.

If you haven't changed your ATF for a long time either that might still mess up your transmission. Some people can elaborate what I'm talking about.

 

He changed it 2k miles ago

 

Yeah, but when did he change it before 2k miles ago? Or did he change it 2k miles ago and suddenly hes having problems? Either way, its just me throwing some stuff out there to think about. Obviously if I can't change the right fluid then I shouldn't even be giving out advice lol.

 

This issue may be with the motor mounts. I had a very similar issue with another one of my vehicles in the past and it was the motor mounts. It was more like a bump that I would feel when beginning to accelerate. I try to refrain from sudden low speed accelerating due to prior occasion of having this issue. Take it in to the dealer and do a diagnostic to pinpoint this.

 

What happened to your trans with the wrong fluid?

 

The Front Brake Solenoid in transmission was messed up. Basically 3 weeks after slipping in 1st and 2nd gear it finally just went into Failsafe mode and I could only drive in 4th gear. This was due to the Front Brake Solenoid failing and possibly something else but I forget. The transmission is being rebuilt and should be ready tomorrow. lol Yeah, I have a box of 12 quarts of Matic S in my garage now.

 

ok went to the mechanic and he told me he could not find anything wrong with the car. I told him about everything that was suggested here and he said everything seemed to be fine. But he did feel the vibration/wobble and could not explain it.

I did a little more searching and found a thread where other people are/were having the same issue. It seems these people are having the issue after they lowered their cars. I just lowered mine as well a couple weeks ago but really did not think that that would be the cause. Also it seems like an X issue. Only thing is that noone has come to a conclusion on what it could be. Anyways here is the link to the thread, I will also bump it to try and get some answers.

https://g35driver.com/forums/v36-bra...h-rs-my-x.html

 

Hmmm strange. It's frustrating having someone look at your car to find nothing ( I am having major vibration issues on the highway that can't be fixed)

 

yes it certainly is. you have prob checked this but balance tires or bent rim(s)?