2007 all wheel drive limited 4.7 117k miles. At cruising speeds it goes in and out of overdrive too frequently, in between gears on acceleration if you are taking it easy on the throttle, and occasionally has a hard downshift. I am leaning toward replacing the solenoid pack and filters to try to fix. Videos look pretty simple, and I have read most of the threads. Does my diagnosis sound reasonable? Anyone want to give tips on how easy it would be to screw up replacing the pack? Thanks