I understand that but also think that the massive wheels and tires have a lot of leverage on the diff. What seems heavy on a normal wheel/tire combo will feel litter with the bigger wheels and tires. I have 100k here, I will try that. I wanted to try it because the mechanic at our LHS had 500k in a new center diff in his truggy and it felt good just spinning it by hand. It was not in the truck.
I have accepted this is going to be tough on parts!