That might be what does it Chris. If you think about it in a normal car when you accelerate the nut's inertia is trying to loosen it, and when you slam the brakes in the air the shock will want to tighten it.
With the reverse gearbox it's the other way round, the nut wants to tighten under acceleration and the sudden deceleration happening when you correct the car in the air is in the loosening rotation/direction. (I have a feeling that will be grammarated
)