Balancers include woodruff keys and mounting bolts (where necessary). Most balancers incorporate a rubber ring between the hub and outer ring. This rubber can deteriorate which causes the outer ring to slip out of the original alignment or separate. ATP balancers are made to meet or exceed the original equipment quality and SAE material specifications. Alternate/OEM Part Number(s): 123031B000 ATP Warranty Information Limited lifetime. Front axle disconnect assemblies 12 months. Front differentials 5 year/100,000 miles. Cables, clutch forks, flywheels, ring gears, transmission parts, cabin air filters: 90 days.