Having broken plenty 10 spline diffs in the past,the problem usually started in the planet gears,the cross shaft lubrication dries up during wheelspin,the shaft would seize onto the planet gear,twist off,the bits would be picked up by the crownwheel and be fired out through the rear of the axle casing making a hole big enough to put your hand in. All this in a second or two! 24 spline diff planet gears are made to a slightly different design,so far so good! I think the answer is a lighter right foot and try not to be on the power when gravity returns over the top of a steep climb.
