Keep in mind, I assume you checked the transmission fluid and it is clean and full. A few things can cause what you described. An engine misfire, slipping clutch pack, bad torque converter, bad torque converter clutch.
Let me know.
Thursday, December 7th, 2017 AT 6:59 PM
Transmission fluid does need changing. No engine lights. I am going to change filter today see what happens. Is it okay to just change few quart's of transmission fluid at a time? I am also thinking that it could possibly be transmission mounts.
Friday, December 8th, 2017 AT 5:27 AM
I would change all the fluid that drains out and the filter and pan gasket as well. Another thing to check is your drive line u joints if there worn out/loose that will cause a vibration. Check them for play in them.