It can be the final drive of the transmission which will give no operational error just noise until the bearing fails completely then the transmission will lock up. A second opinion is always a good idea but it sounds like you will need to replace the transmission. Here are diagrams to show you how.
You will need to remove the cv axles to start.
Check out the diagrams on how to remove the transmission (below). Please let us know what happens.
Images (Click to enlarge)
Wednesday, June 27th, 2018 AT 12:37 PM