Unfortunately, there is no rhyme or reason that we can tell right now.

Some crank 'em & tear them, some don't.

If you're lifted & start tearing boots - they'll keep tearing (no matter what brand of boots you replace them with) until you do one of two things: diff drops or replacement half shafts.

BTW, you should be OK with 1.5 in lift. Troubles seem to start at 2-3 in lifts.