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Hi. It sounds like you are looking more at a transmission concern. Which can be a solenoid or internal worn parts. You should probably check the transmission fluid level first and make sure it is not low. Which can also cause your concern.
I dont see how my response was strange, or how it repeated what you said. Yes I read your question and your description, of pressure releasing and grunting is not very helpful. The part where you describe the rpms revving and the vehicle not moving makes more sense and sounds like an internal transmission problem. An internal trans problem can be caused by worn parts or one of a few solenoids that are in the trans. The first step in checking this is to check the transmission fluid level, as that can also cause your concern. Maybe you just have a leak. You can also have the computer checked to see if any transmission codes were set in the computer. You can do this and let me know the results.