OEM parts categories for 1989 Gmc R3500: Body Mounting, Air Conditioning, Audio/Entertainment (A/C & Heater Control Assembly, A/C & Heater Module Assembly, A/C & Heater Module Assembly/Rear Air, A/C Compressor Assembly, A/C Compressor Mounting, A/C Control System/Vacuum & Electrical, A/C Evaporator Assembly & Blower, A/C Refrigeration System, Air Distribution System/Instrument Panel, Air Distribution System/Plenum, Audio System, Body Mounting, Lamp/Cargo) | Brakes (Brake Booster/Hydraulic, Brake Booster/Vacuum, Brake Caliper/Front, Brake Hoses & Pipes-Rear, Brake Master Cylinder, Brake System, Brake System/Diesel, Parking Brake System) | Brakes, Rear Axle, Propeller Shaft, Wheels, Tires (Axle Assembly/Rear, Axle Assembly/Rear Locking Differential, Brake Assembly/Rear Drum, Differential/Locking, Rear Axle Vent Hose, Wheels & Wheel Covers) | Cab And Body Structure, Mirrors, Doors, Trim, Seat Belts, Wipers (Compartment/Seat Separator, Door Hardware & Trim/Side Rear, Door Hardware/Side Front, Door Hardware/Side Rear, Door Trim/Side Front, Floor Covering & Sill Plates, Front Seat/Bench, Front Seat/Bucket, Instrument Panel & Related Parts, Insulators/Dash Panel, Lamp/Dome, Mirror/Outside Rear View, Moldings/Garnish & Roof Trim, Moldings/Roof Drip, Power Window & Door Lock System, Rear Seat/Bench, Seat/Bench, Sheet Metal/Body, Sheet Metal/Body Side & Roof, Sunshade, Wiper System/Windshield) | Cooling System, Grille, Oil System (Engine Block Heater & Related Parts, Engine Cooling System-Auxiliary Cooling Fan, Engine Oil Cooler, Engine Oil Cooler Lines & Related Parts, 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 Linkage, Engine & Transmission Mounting, Engine Assembly & Partial Engine, Engine To Transmission Mounting) | Frames, Springs, Shocks, Bumpers, Fascias (Bumper/Front, Bumper/Rear, Bumper/Rear Step, Frame, Spare Wheel Carrier/Frame Mounted /Glide-Out, Spare Wheel Carrier/Side Mounted, Stabilizer Shaft/Rear, Suspension/Rear, Trailer Hitch) | Front Axle, Front Suspension, Steering (Steering Column-Non Tilt Floor Shift, Steering Column/Key Release Tilt Wheel, Steering Column/Non-Tilt Column Shift, Steering Column/Tilt Wheel, Steering Gear Assembly, Steering Linkage, Steering Pump Assembly, Steering Pump Mounting & Lines, Steering System & Related Parts, Steering Wheel & Horn Parts, Suspension/Front) | Front End Sheet Metal, Heater (Heater & Blower Assembly, Heater Assembly Rear Auxiliary, Heater Control Assembly, Hoses & Pipes/Heater & Related Parts, Jack & Tool Stowage, Sheet Metal/Front End) | Fuel System, Exhaust, Emission System (A.I.R. Module & Wiring Harness, A.I.R. Pump & Related Parts, Accelerator Control, Accelerator Control Engine Compartment, Accelerator Control Pedal & Rod, Air Intake System, Cable Assembly, Hand Throttle, Cruise Control, E.C.M. Module & Wiring Harness, E.F.E. & E.G.R. Valve & Vent Tubes, E.G.R. Valve & Vent Tubes, Emission Controls Wiring Harness, Exhaust System, Fuel Filter, Fuel Injection System, Fuel Supply System, Fuel Supply System-Rear, Fuel Supply System/AT Engine Front, Fuel Tank & Filler Pipe, Fuel Tank & Supply, Heat Shields/Exhaust Muffler, Injection Pump/Fuel, T.B.I. & Related Parts, 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 & Stripes-Body, Moldings, Nameplates & Ornamentation/Side, Pickup Box/Fleetside, Stripes) | Speedometer Gears, Shaft, Adapter (Speedometer Cable/Gear & Adapter) | Starter, Generator, Ignition, Electrical, Lamps (Back-Up Lamp Switch & Related Parts, Battery Cables & Related Parts, Battery Cables & Related Parts With Battery, Distributor/Ignition, Generator Assembly, Generator Mounting, Lamps/Front, Lamps/Rear, Lamps/Roof, Spark Plug Wiring, Starter Motor, Starter Motor And Mounting) | Transmission - Automatic (Automatic Transmission Auxiliary Accumulator Valve, Automatic Transmission Case & Related Parts, Automatic Transmission Clutch Gears, Automatic Transmission Control Valve, Automatic Transmission Oil Cooler Pipes, Automatic Transmission Oil Pump, Automatic Transmission Parking Lock Linkage, Automatic Transmission Vacuum Pipe & Fluid Level Tube, Shift Control) | Transmission - Manual (Manual Transmission Case & Related Parts, Shift Control)