Welcome to 2CarPros.
Have you checked the transmission fluid to make sure it isn't extremely low? Also, if there is no change in sound, it can be a number of things such as a faulty transmission control module, a range switch, bad or disconnected torque converter (which I feel would make some noise), a faulty pressure sensor and the list goes on.
The first thing I would recommend is to have the computer scanned to identify diagnostic trouble codes. You will have to get a scanner or someone who has a scanner that can reads transmission codes. If you could do that, it will make things much easier.
Just fyi, here is a quick video showing how a scanner is used:
https://youtu.be/YV3TRZwer8k
Let me know if you can have that done or if you have other questions.
Take care,
Joe
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Saturday, March 16th, 2019 AT 4:31 PM