What does the pinion snubber do ?

My B-bod never hooked better....once I took the snubber off. All the snubber did was cause the suspension to momentarily go 'solid' and then unload and spin the tires into oblivion.
The springs need to be free to try and lever the body upward in order to force the axle/tires downward (when things are working right). The snubber seemed to interfere with this action when I watched a slo-mo video of my car.