Nitro Gear DANA 80 Ring & Pinion. (Tech Note: Carrier break is 4.10, however there is a thin 3.73 gear that allows you to run 3.73's on your 4.10 case. Look for it marked as Thin)
Please Note: This is a thin gear not standard thickness, fits 98 and Newer Ford Dana 80 rear ends! Or 4 series case on any other Dana 80
