Blood, Sweat and Gears...
I had my 4.10's installed by a local ford dealership last spring. When I did my LCA's this year I looked at how much I can turn the drive shaft without the axles moving. I think 1/8th turn is to much, but I am no mechanic. I would think you would want some slop for when the diff gets hot and things get tight. I would think it would be a matter of installing more spacers to pick up some of the backlash.. Does anyone have any thoughts?