Nissan Pathfinder Noises Grind

Recently I Am Getting Some Grinding Noises When I Am Shifting From Neutral Into Reverse, 1-2, 2-3 Upshifting But No Real Sounds Downshifting...

I Just Engaged The 4-wheel Hi On A Recent Ski Trip. Worked Fine- Re-engaged Into 2-wheel Drive. After Leaving Rest Stop- The Car Started To...

I Recently Borrowed My Sons Car To Drive For A Month Or Two. As I Was Driving It Home I Heard The Gears Grinding A Little When You Shift...