Under acceleration the pinion rotates about the ring gear in a rotation that rotates the nose of the pinion upward toward the floor, hence the adjustable pinion snubber use for drag racing.

On the car the way it sits today with XHD (Hemi/440) leaf springs the car will actually squat in the rear suspension as the front end lifts shifting weight to the rear of the car.

If you seen all the parts / tools and spare tire etc etc I packed into the trunk you would be amazed. Maybe I should weigh all the junk I had back there for the Hot Rod Power Tour, U Of I at Champaign Illinois leg of the event from the burbs of Chicago.

So far I still have the snubber off and it looks like the pinion snubber will stay off. There are still other bump stops that limit suspension travel in the rear suspension.

The car still leaves off the line pretty hard all things considered when you factor in the 2.94 axle ratio that is out back currently.......