noel gump

I have emailed yall but for some reason I can not sent the video of the issue

Have you figured this out I have a 2014 gmc sierra v6 4l60e 200k miles. I've been having this issue for about 30k miles. I put it in neutral and it stops fine but in drive it shakes I've noticed when I'm on a slant like hill type and put it in drive it will shake hard until I put it in neutral I have a brand new transmission and rear end rebuild with both now 55 thousands miles roughly I want to say