Product Disclaimers: Fits 1975Ð1986 Chevrolet C30/C35/C3500 Crew Cab Dually and 1987Ð1991 R30/R3500 Crew Cab Dually. Not designed for diesel applications. Lowering rate: Front 4 in / Rear 4 in. About this product Front: 4 in drop / Rear: 4 in drop. Fitments Year Make Model Submodel Drive Type Engine Fuel Type Body Type Notes 1975, 1978, 1980 Chevrolet C30 Cheyenne RWD 4.1L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1975 - 1981 Chevrolet C30 Cheyenne RWD 4.8L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1978 Chevrolet C30 Cheyenne RWD 5.0L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1975 - 1981 Chevrolet C30 Cheyenne RWD 5.7L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1976 - 1978 Chevrolet C30 Cheyenne RWD 6.6L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1975 - 1981 Chevrolet C30 Cheyenne RWD 7.4L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1981 - 1986 Chevrolet C30 Custom RWD 4.8L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1981 - 1986 Chevrolet C30 Custom RWD 5.7L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1981 - 1986 Chevrolet C30 Custom RWD 7.4L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". 1975, 1978, 1980 Chevrolet C30 Custom Deluxe RWD 4.1L GAS Crew Cab Pickup Not designed for diesel applications. Lowering rate: F: 4" / R: 4". Media Drop Spindle Set: Lowering Shackles: