Emmanuel L

After my dealership that my front suspension needs to be replaced after a few weeks and have it also aligned (it is a 2013 C 300 sport 4matic 3.5L v6). I went ahead replaced the old system with a new one but as I was test driving sure everything was nice and tight transmission when in park sounds like normal but when in reverse Drive the RPM drops down a little bit and the car vibrates differently than before. I googled why was my car vibrating like there’s some say it’s transmission needs to be changed, others say my engine mount or my transmission mounts are way off. Before I spent way too much money at my dealership. Can anyone help me?

c32jet

Not sure if this could be your issue... but something you can research to see if it applies. I have a 2002 c32 and it has a 40 MPH vibration (slight, and more so when cold) that I am still working to figure out. What I did discover is that there is a small shim (think washer with varying thickness 1MM / 2MM / 3MM / 4MM) on/near the rear differential. My car came with a 4MM as stock. As I put on new motor mounts and tranny mount, I 'think' this changed the drive line angle and this is what the shims are for. They help adjust that angle. I had a big difference as I went lower (down to a 3MM / then to a 2MM / then to a 1MM and now running with it out completely). I still have a minimal vibration at 40 MHP and have had the mounts in for a few years now... I am going to pop the 4MM back in today and see what happens.
Any way, hope this is helpful to you. Not sure if a new front suspension would affect this... but a bit of info for you to research and check on.