Will having 2 different tread depths reak havoc or have negative effects on drivetrain? for example: 2 new tires and 2 50% worn tires. From what I've been told it does on full time 4wd. It's kinda hard to believe that 1/3 of an inch or less would cause that much trouble on something that should be engineered to perform with inconsistencies since tread wear is a fact of life and uneven tread wear is too, for those of us that don't get their alignment checked like they should.