My 01 SD F250 with V-10 and an open 10.5 dif with 3.75 gears got very sloppy. I pulled the cover off and raised one tire off of the ground. By rotating it back and forth it was obvios the play was in the spider gears and pin.
I replaced them with a Yokon spider replacement set and problem solved.

Any body else have this happen at only 50,000 miles?

 

i have not heard of anything like that before in the sterling. I have 180k mi on mine, running strong, still havn't broke the factory seal.