The shaking was mild when purchased Pre-owned in 2019. The shaking has become much more pronounced over time. At first it was just when hitting 40 mph under mild acceleration; now it occurs when hitting 30 mph and then again at 38-40mph, and I have noticed it beginning to occur at 47-50mph.

I have asked the Cadillac dealer about it and they said it not uncommon in some GM vehicles. They were not concerned; although when it happens, it is disturbing to feel in the shifting.

This appears to be a typical transmission problem previously reported by several consumers. When accelerating between 25 and 35 MPH the transmission shudders and shakes the entire car. Engine RPM is in the 1000-1500 range when this occurs.

Bad vibration from transmission or torque converter.

Update from Apr 24, 2019: Called cadillac dealer. Their going to change the transmission fluid on Monday the 29th. They said that should fix the problem. I keep you posted.

Sometimes violent (hard) upshifts and downshifts, violent shudder when accelerating, not hard acceleration just normal around town under 40 MPH acceleration. Like slipping, shudder, vibration, very very unsettling on such an expensive car.

When driving my car in low gears you can feel the car auto shift into next gears causing the car to shake hard. It is hard to describe that part. Also, gears started to have delay in shifting after the first year. I have asked to have it checked several times when Im at the dealership. However, they say nothing is wrong with it when clearly there is something wrong. Also, when you press the gas pedal its almost like it vibrates with hesitation.