all gears failed/ reverse was shuttering. Fluid full and clear

Hello, have you performed any testing to see if there are any diagnostic trouble codes present that could aid in diagnostic testing? Take the time to follow a process of testing before guessing at some kind of pump failure. If your fluid is full and the proper color, not burnt, no one has been inside the transmission, I would be surprised if a sudden failure like this would just occur. But, anything is possible le indeed.