OEM parts categories for 1988 Gmc C3500: Body Mounting, Air Conditioning, Audio/Entertainment (A/C & Heater Control Assembly, A/C & Heater Module Assembly, A/C Compressor Assembly, A/C Compressor Mounting, A/C Control System Electrical, A/C Refrigeration System, Air Distribution System/Instrument Panel, Antenna/Fixed, Audio System, Body Mounting & Radiator Mounting) | Brakes (Brake & Steering System-Hydraulic Lines, Brake Booster/Hydraulic, Brake Booster/Vacuum, Brake Caliper/Front, Brake Lines/Front, Brake Lines/Rear, Brake Master Cylinder, Brake System/Power, Parking Brake System) | Brakes, Rear Axle, Propeller Shaft, Wheels, Tires (Axle Assembly/Rear, Brake Assembly/Rear Drum, Differential/Locking, Prop Shaft Hanger Bracket, Rear Axle Vent Hose, Road Wheel/Styled, Wheels & Wheel Covers) | Cab And Body Structure, Mirrors, Doors, Trim, Seat Belts, Wipers (Compartment/Seat Separator, Door Hardware, Door Trim/Side Front, Floor Covering & Sill Plates, Folding Seat Hinge, Instrument Panel & Related Parts, Lamp/Dome, Lamps/Cargo, Mirror/Outside Rear View, Rear Seat/Folding, Seat Belts/Bench Seat, Seat Belts/Bucket Seat, Seat/Bench, Seat/Bucket, Seat/Split, Sheet Metal/Body, Trim Interior, Trim/Interior-Roof, Windshield & Windows, Wiper System/Windshield) | Cooling System, Grille, Oil System (Engine Block Heater & Related Parts, Engine Coolant Fan & Clutch, Engine Coolant Fan-Auxiliary, Engine Oil Cooler And Lines, Engine Oil Filter Adapter, Engine Oil Pressure & Temperature Switches, Grille/Radiator, Hoses & Pipes/Radiator, Pulleys & Belts/Accessory Drive, Radiator Assembly, Radiator Mounting & Related Parts) | Engine (Clutch Assembly/Diaphragm Spring Type, Clutch Cylinders/Hydraulic, Clutch Linkage, Engine & Transmission Mounting, Engine Assembly & Partial Engine) | Frames, Springs, Shocks, Bumpers, Fascias (Bumper/Front, Bumper/Rear, Frame, Spare Wheel Carrier, Springs/Rear, Suspension/Rear, Trailer Hitch Platform) | Front Axle, Front Suspension, Steering (Coolers/Power Steering, Steering Column/Non-Tilt, Steering Column/Tilt, Steering Gear Assembly, Steering Gear Assembly/Manual, Steering Linkage, Steering Pump Assembly, Steering Pump Lines, Steering Pump Mounting, Steering Shaft & Coupling/Intermediate, Steering System & Related Parts, Suspension/Front) | Front End Sheet Metal, Heater (Heater & Blower Assembly, Heater & Vent Control Cables & Harness, Heater Control Assembly, Hoses & Pipes/Heater & Related Parts, Insulation & Seal/Hood, Jack & Tool Stowage, Labels, Lamps/Under Hood, Sheet Metal/Front End) | Fuel System, Exhaust, Emission System (A.I.R. Pump & Related Parts, Accelerator Control Engine Compartment, Accelerator Control Pedal & Rod, Air Intake System, Cruise Control, E.C.M. Module & Wiring Harness, E.G.R. & Exhaust Pressure Regulator Valves, E.G.R. Valve & Vent Tubes, Exhaust System, Fuel Supply System-Front, Fuel Supply System-Rear, Fuel Tank And Mounting, Injection Pump/Fuel, M.A.P. & Oxygen Sensors & E.S.C. Module, Throttle Body Injection, Vapor Canister & Related Parts) | Maintenance Parts, Fluids, Capacities, Electrical Connectors (Normal Maintenance Replacement Parts) | Rear Body Structure, Moldings & Trim, Cargo Stowage (Decals & Nameplates/Endgate, Decals/Pickup Box Side, Fender/Pickup Box, Moldings/Cab & Body Side, Pickup Box/Fleetside, Pickup Box/Stepside, Stripes/Body Side & Endgate) | Starter, Generator, Ignition, Electrical, Lamps (Auxiliary Battery & Wiring, Battery Cables, Distributor/Ignition, Generator Mounting, Horn Button & Contact, Lamps/Front, Lamps/Rear, Lamps/Roof, Starter Motor, Starter Motor And Mounting, Wiring Harness/Chassis, Wiring Harness/Engine, Wiring Harness/Instrument Panel, Wiring Harness/Trailer & Camper Wiring Harness) | Transmission - Automatic (Automatic Transmission Auxiliary Accumulator Valve, Automatic Transmission Case & Related Parts, Automatic Transmission Clutch Gears, Automatic Transmission Control Valve, Automatic Transmission Oil Pump, Automatic Transmission Parking Lock Linkage, Shift Control, Throttle Valve Cable, Transmission Filler Tube & Trans Vacuum Pipe) | Transmission - Manual (Manual Transmission, Shift Control)