Brand new Motive Gear Ring & Pinion 3.73 ratio front Diff TJ Dana 30 or Yamaha YXZ 1000 Proformance motor sports/ LeRue Proformance products Rear diff Gear set. This gear set has been WPC cryogenically heat treated and WPC coated for longer life span and increased power handling capabilities. Used in both the jeep TJ front diff and the Proformance Motorsport/ LeRue Proformance products rear diffs. Able to handle more power and torque then none treated gears sets. These are a prefect replacement for any dana 30 gear sets.