For Sale: (1) Mopar Performance #P3690182 adjustable pinion snubber for 8-3/4" axles.
Picture at
http://t3.gstatic.com/images?q=tbn:A...5XSGWMfyANh7s5
"Helps control axle windup by adjusting the height to the floor pan. Units fit to the center front of the rear axle housing." But you know that already.
Never installed. Like new.
Asking $25 plus shipping.