Description:Cat input shaft assemblies are a key component in the planetary assemblies that power tough Cat transmissions to convert engine power into the exact combination of speed and force required by individual machines.Attributes:• Hardened steel shaft with dowel• End 1 External Spline Number of Teeth: 43• Center External Spline Number of Teeth: 55Application:Consult your owner's manual or contact your local Cat Dealer for more information.