To install this steering box on a 1967 C Series truck, frame modifications in the steering box area are required. A new 3/4 x 30 spline rag joint is available through Detroit Speed (P/N: 090205DS). Detroit Speed hose kit (P/N: 091202DS) can be used with this steering box. Detroit Speed steering shaft kits are available to replace the factory rag joint and coupler: P/N: 092541DS - 1979-87 GM C10 Truck P/N: 092542DS - 1973-78 GM C10 Truck P/N: 092543DS - 1968-72 GM C10 Truck