I’m going to chime in just so you are aware of what could happen. When I did my first transmission service back around the 56k mark I did the pan drop, filter change. Serviced it and it would not move. Dropped the pan again, checked the filter, repeat. Still wouldn’t go. Had it towed to the local dealer. They had to drop the valve body and clean it out due to fine metal particles clogging it up and preventing it from going into gear. There was some other irregularities that they found which made it all covered under warranty, however the thought process was that if I would of just had it flushed the particles wouldn’t of settled. Been getting it flushed every 60k or less with no further issues. Not saying which is best, just making you aware of my situation. To me without the drop and no go, they would never of found the broken spring and missing lubricant. (I think that was the irregularity), which would of eventually of reared it ugly head, so it worked out for me.