A pinion snubber works much like a traction bar. as the spring wraps, the snubber contacts the floor to stop the motion.

This has me confused because so many people rag on guys who have traction bars on a Mopar. It does the same thing, only it has one contact point.

I would rather use a traction bar system that uses two points of contact, that are closer to the wheels. It makes more sense to me to have two contact points as close to the wheels as possible (since the two tires may be on varied surfaces causing different wrap up on each spring) than to have one central contact point.