I took a pair of cutters to my front diff pipe some six years back when this first came to light . Hot climates like here have significant expansion .
That was ( I think ? ) just after the front diff was warranty replaced at 3 years and 22,000 miles for grinding noises . OK since , and at 65,000 miles now .
I did not however bother getting the new part . I seen to remember it wasn't yet over here at the time ............... and forgot about it until reading this post !
Have a Merry Christmas and stay safe in that bad winter climate you have there . Neil