Well, I recall posting this video here awhile back for y’all. I then decided to do some research on my down time. Then came to the conclusion, this noise listed below is,

https://youtube.com/shorts/9XhcXzdkFGk?feature=share

According to the owners manual I read it states the following, 

”Self-test feature
The ABS includes electronic sensors, electric pumps, hydraulic solenoids and a computer. The computer has a built-in diagnostic feature that tests the system each time you start the engine and move the vehicle at a low speed in forward or reverse. When the self-test occurs, you may hear a “clunk” noise and/or feel a pulsation in the brake pedal. This is normal and does not indicate a malfunction.” 

After all this time, thinking my transmission was going out. This whole time, it’s just a computer maintenance feature of checking the ABS system. So I would like to thank you for all y’all’s advice and help! Then also let me know down below if y’all have the same noise/occurrence in your Nissans!