so you have yukon 4.10s proffesionally installed?
take me a few pictures of your pinion angle. What leaf springs are you running do you get axle wrap? If you do how badly what blows up pinions or ring gears or both evenly?
I know when I was blowing them up I would just break two or three teeth off the ring and on off the pinion every time. One set I broke like six off the ring and the pinion just got chewed up a little. Mine were caused from to much power breaking and 4ds but yeah...
It would help a ton seeing a picture of front and rear pinion angles and spring specs also do they break wheeling or wheeling and driving its easier to know what you were doing when it happened to find a cause.