I don't think you will have problems with them breaking, unless your axles aren't geared low. Without the axles geared low, your butting a lot of strain on the rest of the drivetrain, but if it is low, then no worries. I have video of my buddy's jeep bouncing to where the front and rear tires were actually coming off the ground and hammering down. he broke a locker in the front end doing it, but the toyota case held up just fine.
