[joeyp85]

So recently my rear diff was replaced due to metal shavings in the diff fluid. After driving the car for about a couple weeks after the replacement, I’ve come across a new issue. While cruising on the highway in 8th gear in tour mode non paddles, as i accelerate very slightly to increase speed, the whole car vibrates as if It was going over the small speed bumps before a toll booth. I figured at first maybe it’s the car dropping gears and switching from v4 to v8 mode but I kept the cylinder mode indicator on my dash and the car was still doing it even in 8 cylinder mode. Every time I slightly increase throttle, It always does it and the car sounds like it is struggling and I can feel it in the throttle response. The transmission also shifts very rough at very low speeds and I’m guessing it has to be an issue with the transmission. if Anyone can give input it would be greatly helpful and appreciated!

[Cameron27]

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[mikey8]

Originally Posted by joeyp85

So recently my rear diff was replaced due to metal shavings in the diff fluid. After driving the car for about a couple weeks after the replacement, I’ve come across a new issue. While cruising on the highway in 8th gear in tour mode non paddles, as i accelerate very slightly to increase speed, the whole car vibrates as if It was going over the small speed bumps before a toll booth. I figured at first maybe it’s the car dropping gears and switching from v4 to v8 mode but I kept the cylinder mode indicator on my dash and the car was still doing it even in 8 cylinder mode. Every time I slightly increase throttle, It always does it and the car sounds like it is struggling and I can feel it in the throttle response. The transmission also shifts very rough at very low speeds and I’m guessing it has to be an issue with the transmission. if Anyone can give input it would be greatly helpful and appreciated!

I noticed the same exact thing in my new 2017 SS Auto. It feels at 72 mph like Im going over little speed bumps. It really annoying.... When I hammer down, there is no problem.

[aldaran]

Originally Posted by mikey8

I noticed the same exact thing in my new 2017 SS Auto. It feels at 72 mph like Im going over little speed bumps. It really annoying.... When I hammer down, there is no problem.

I know what you mean about the little speed bumps feeling. Took mine in and dealer replaced the torque converter. The only thing that worries me is if it's a design flaw on the torque converter it will do it again.

[mikey8]

Originally Posted by aldaran

I know what you mean about the little speed bumps feeling. Took mine in and dealer replaced the torque converter. The only thing that worries me is if it's a design flaw on the torque converter it will do it again.

How long has it been since it was fixed?

[joeyp85]

Originally Posted by mikey8

How long has it been since it was fixed?

I would say maybe about a month now, month and a half and the car just feels weird like it doesn’t feel normal. Even while the car is accelerating, the rpm’s slightly dip as speed is increasing and you can hear and feel it

[joeyp85]

Originally Posted by mikey8

I noticed the same exact thing in my new 2017 SS Auto. It feels at 72 mph like Im going over little speed bumps. It really annoying.... When I hammer down, there is no problem.

It’s the weirdest thing to be honest and i know for a fact something isn’t right with the transmission or something else. I’ve never had this problem before and now it’s irritating. I also have a rattling noise as well which sounds like metal clacking together coming from the trunk but my trunk is empty and I feel like it could be my exhaust from when my diff was replaced. The dealerships by me are the absolute worst.