I’ll try and explain this best I can.
I’ve got a fairly bad vibration in the vehicle at modest acceleration. If I set the cruise control at highway speeds I notice it between 1500- 1775 rpm as the vehicle tries to maintain speed. If I accelerate more heavily-say 2500-3000 rpm- I feel nothing.
The vibration feels like I am going over a rumble strip and as it happens I see the tachometer bounce slightly between 1775 and 1500 rpm.

I notice it driving around town in lower gears as well but it isn’t vibrating when it is changing gears. Usually around slight acceleration.

I’ve dropped the pan on the tranny and didn’t see anything obvious. Normal amount of metal on magnet and oil looked ok.
Used a scanner to check for misfires it didn’t show any.

I plan on draining the t-case and diffs next.

Any one experience similar problems?
I am fearing a bad torque converter.

 

check the joints and bearings on the entire driveline

 

I have this exact same problem on a 2016 suburban. I noticed it getting progressively worse over the past week. I am now hearing the "rumble strip" noise as well. Did you ever figure out what this was? Thanks!

 

I've started having the same intermittent vibration issue recently, any idea what it is? I don't have any any error codes when I do a diagnostic check on the car. I also noticed the tachometer bouncing around when at a constant speed and level roads. Any suggestions would be appreciated.
Thx